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WhatsApp's CEO, Jan Koum in a blog post revealed the news and also noted that the company added 100 million active users in the last four months alone.
WhatsApp
The blog post said, "Our goal in creating WhatsApp was to empower people through technology and communication, no matter who they are, or where they live. WhatsApp has reached a milestone that no other mobile messaging service has achieved: 400 million monthly active users, with 100 million active users added in the last four months alone. This isn't a count of people who just registered for WhatsApp - it's the number of people who are actively using the service every single month."
The mobile focused messaging company told AllThingsD that WhatsApp wants to turn the discussions of the shared numbers by other mobile instant messaging services to be about active users and not registered users. AllThingsD quotes Koum, "We're a bit fed up and frustrated about people talking about registered users. We think it's important for us as a leader in the space to speak up and be ethical."
A recent report had suggested that some messaging apps have been using marketing muscle to compete with big names in instant messaging service. The report claimed that WeChat, a unit of Tencent, had budgeted up to $200 million for marketing overseas.
In November, Line messaging app claimed to have a user base of 300 million worldwide, out-of-which it added 100 million users in just four months. However, Line declined to reveal the number of active users currently using its services. AllThingsD cites Kik Interactive's figures of 100 million users, though notes that the company never detailed the number of active users.
The WhatsApp blog post also noted that the company currently has just 50 employees, and mainly include engineers. Further, it claimed to reach the 400 million mark without spending money on targeted ads or even marketing campaigns.
WhatsApp has been growing rapidly and has been a leader in the mobile instant messaging service. The popular mobile instant messaging service reached 300 million active user base in August and in no time has reached 400 million active users.
AllThingsD has shared some statistics of the WhatsApp service which include 16 billion messages per day; about 32 billion messages are received per day and some 500 million images are sent per day by users on WhatsApp.
Via : NDTV Gadgets
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Windows Phone
Slowly and gradually , Windows Phone is gaining momentum , with 185 % growth  and major and much awaited apps like Instagram and Angry Birds Go! now available on Windows Phone Store , developers are also recognizing the momentum and as per Microsoft’s Blog , Windows Phone store has crossed 200,000 app mark.
The growth is in part due to Nokia, which had been pushing the OS with their dedicated efforts by releasing one amazing device after the other , For consumers , it means more choices and for developers more opportunities to grow within the Windows Phone Platform.
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I'm sure that your geek has a tablet, a phone, or both. So, an app is a perfectly acceptable geeky gift. Your geek will appreciate your understanding and your ability to think outside the box. He or she will have many hours of enjoyment (and you to thank), if you given him or her the coolest, droolworthy apps.
I know that for us "old schoolers" an app seems like a cheesy gift. That somehow it's less than an actual gift. But you have to change with the times. And giving an app thrusts you squarely into the contemporary age of mobile computing.
These apps are in no particular order but are oriented toward Apple device* owners. Enjoy.
Vintagio
As you know, if you've kept up, I love photography and video. My favorite form of entertaining visual imagery is the short film. Vintagio is the perfect app for creating short films that also employ the artistic power of "filters". You can create films that look as if they were created in the 1920s through the 1980s. Of course, you can also choose not to use a filter and just shoot straight video but that's no fun.
My personal favorite is the 1920s Newborn filter at 3.0X normal speed with the Plucky Daisy song accompanying the faster than normal scenes. This turns your drab film into an old timey black and white, fast moving, retro wonder. It looks like a silent film from the early days of filmmaking.
Currently on sale for $1.99. Regular price is $3.99. Hurry.
Real Racing 3
If your geek is a video gamer and likes racing, this is the ultimate app. Real Racing 3 (RR3) is the best and most addictive racing game that I've ever played. It should be because it's made byElectronic Arts, the people who know more about video gaming than anyone else on the planet.
RR3 has a limited number of tracks but an almost unlimited number of available cars. This free app does have in-app purchase options for Gold and Racing dollars (R$) but you don't ever have to pay any money to play, to buy cars, to upgrade your cars, or to play. You can race forever free of charge.
So, giving this app should be easy but should come with a warning: Don't buy any Gold unless you have permission to do so. It's very tempting to burn your Gold for upgrades, for speeding up upgrades, for unlocking higher racing Tiers, or for unlocking new cars—don't do it.
I say don't do it but you're perfectly able to do it, if you want. I'm just saying that you should resist the temptation. Save up your Gold for really important purchases. Gold is hard to earn, so be frugal.
$0.00 to download and play but in-app purchases can run upwards of $100.00 for more R$ and Gold.
iSSH
The iSSH app is the ultimate connectivity app for anyone who uses Linux, UNIX, or Mac systems and must connect remotely. iSSH supports the X protocol and gives you a very good user experience. I've tried several SSH remote connectivity apps and I like this one the best.
It's made for iPhone and iPad and has some very advanced features, including:
  • Multitasking support
  • Tunneled VNC client
  • Tunneled RDP client
  • Arbitrary port tunneling through SSH
  • SSH, telnet, VNC, and RDP work via EDGE, WiFi, and 3G.
  • Multiple simultaneous connections
  • Portrait and landscape mode support
  • Stored connections
  • Command execution on connection
  • Multiple fonts
  • Customizable keyboards
  • Multiple window managers
  • Agent forwarding
  • Bluetooth keyboard compatible
And it has many other features as well. One of my favorites is that you can swipe between the multiple open connections. The iSSH app receives accolades from anyone who reviews or uses it. As of this writing, it has received 1,858 reviews on the iTunes Store site and stands at a solid four stars. The new version has received a few bad reviews but as a long term iSSH user, and someone who has spoken to the developer by phone, I can tell you, without reservation, that it is a five star app and well worth its $9.99 price.
Printer Pro
Printer Pro allows you to print to a shared Windows or Mac printer from your iPad. There's also an iPhone version. In my opinion, printing is a major gap on iDevices and a fail for Apple for not building that capability into the devices themselves.
With Printer Pro, you can try before you buy, which is a good thing, because Printer Pro might not work with your printer. The free version allows you to check first.
Printer Pro works with web pages, email attachments, clipboard content, iWork documents, Photos, documents from Google Drive and Dropbox, and contacts. I've seen very little that it won't do. For me, it's the best $6.99 I've ever spent on an app. The iPhone version is $4.99.
Dropbox
Yes, I know that Dropbox is a free app, but it's not the app that's important, it's the cloud-based storage space that is. You get 2GB free by signing up for an account. If your geek a phoneographer or someone who keeps everything, then she'll need more space. By using friend referrals, your geek can gain up to 16GB of free storage.
You can get 100GB of space for $9.99 per month. I paid that much for their 50GB plan until they upgraded me to the 100GB one. The cool thing about Dropbox is that it has widespread support from third party vendors. You can seamlessly share files between your iGadgets, your laptop, your desktop, your Linux system, your Windows system, your Mac, and your Android-based stuff. And you can access it via a web browser if necessary.
It's storage. Plain and simple. Nothing more and nothing less. Nothing very exciting. It does provide a much-needed backup for files that you can't afford to lose.
$9.99 per month for 100GB and up to 16GB free from referrals.
Angry Birds
Another video game. But this one's different. Aren't they all? But seriously, Angry Birds and all of its incarnations (Seasons, Star Wars, Rio, etc.) are all fun. Frustrating fun is what I call it. Angry Birds is not only one of the most successful apps of all time, it's also one of the most successful video games of all time. Addictive and annoying, Angry Birds grows on you. Your geek probably has one version or another on his or her gadget already.
You'll know if your geek has Angry Birds because you'll hear the side effects, I mean sound effects, clearly emanating from your geek's gadget. The oinks, crashes, laughter, and various bird-like vocalizations are coming from the game not your geek.
Angry birds, like a fez or a bow tie, is cool. And any of the many iterations of it can be purchased via the App Store for a mere $2.99. Prices vary for the other versions.
SketchBook Pro
SketchBook Pro by Autodesk (the AutoCAD people) is one of the coolest apps for drawing, sketching, and creating advanced drawings on your iPad. It is a professional grade tool but simple enough for the beginner. You might recognize the name of this app as a desktop application, which it is. It's the same applicaiton with the same features available to you.
You can create everything from simple line drawings to realistic renderings. I suggest that you use a stylus of some sort and have a steady hand. But, with this tool you can create your masterpieces. There are some impressive examples available on the application's iTunes page for you to see.
At $2.99, it's a deal and an app that your geek will love. Hey, anything to take his or her mind away from Minecraft for a few hours is worth $3.00 to me.
GLSL Studio
For the hardcore geek, there's GLSL Studio. I say 'hardcore' because that's what you'd have to be to use this app. GLSL Studio is the first full featured OpenGL ES 2.0 programming environment for iOS. If you don't know what that is, then ask your geek. If he/she doesn't know, skip ahead. If he or she does know, then spring the $7.99 from your virtual wallet for your future programmer geek. It might be the best lunch money you ever spent.
The app has some crazy advanced features that only a true programming geek would appreciate, but trust me, they're awesome.
"Create, edit and compile full vertex and fragment shaders right on your iOS device! Custom vertex data, textures and attributes/varyings/uniforms are all managed using an easy interface making testing under different conditions quick and simple.
GLSL Studio's native code editor has been built from the ground up to provide the most comfortable coding environment available on a touchscreen device with desktop grade features such as syntax highlighting and code completion."
A $7.99 investment.
Netflix
Netflix is another free app with a paid subscription behind it. For $7.99 per month, your geek can watch TV shows, movies, documentaries, news, cartoons, and lots of retro content like Classic Doctor Who, Doc Martin, The IT Crowd, and even some non-British programs such as Eureka, Psych, and Parks and Recreation. Lots of fun for a little money.
Go ahead, make your geek happy with a $7.99 per month Netflix subscription. Subscriptions are limited to two simultaneously watching devices but that seems OK for 'normal' geeks.
Via: ZDNet
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Google announced a slate of new apps for Chromecast last week, but as most were less than compelling, it’s time to speculate on what else might be in the pipeline.According to Janko Roettgers over at GigaOM, Google plans to launch further “waves of Chromecast apps” in the near future. Here are a few guesses as to what they’ll be.
Mari’s Purely Speculative Chromecast App List
First up, Aereo! The little streaming-start-up-that-could is reportedly making a profit in some markets, and CEO Chet Kanojia has said publicly that Chromecast support is on the way. Given the limited reach of Aereo, Chromecast integration isn’t likely to be on anyone’s make-or-break list. But with Aereo already available on Roku and Apple TV (via Airplay), Google’s streaming stick would be a natural platform extension.
Second app: Time Warner Cable. TWC COO (soon to be CEO) Rob Marcus said last week that the company is getting ready to launch its TV app on a new IP video device. Marcus could easily have been referring to the Apple TV with his statement, but it’s not unreasonable to think Chromecast could be on the horizon too. Time Warner has been remarkably progressive about getting its app out to as many platforms as possible. Given Google’s success with Chromecast, a new TWC app released just before Christmas would be well-timed for the many Americans sure to unwrap Google’s stocking stuffer this year.
Third and finally, I’m betting on ESPN. I’ve heard nothing at all to support this theory, but the sports network is typically quick to adopt new technologies. It also has some of the most coveted online video available through its WatchESPN app. And while ESPN has been highly focused on iOS development of late, Chromecast could be just the success it needs to make a bigger push on the Android operating system.
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Apple TV adds Watch ABC
Not to be outshined by Google's announcement that more apps were joining theChromecast revolution, Apple TV today made its entertainment repertoire a bit richer. As 9to5Mac points out, Cupertino's tiny box is now giving viewers access to applications including Bloomberg (which will be streaming news 24/7 as well as offer on-demand content), Watch ABC, Crackle (in HD for the first time) and, for Korean speakers, KORTV. These new additions show that Apple is getting increasingly passionate about its hobby, as over the past months we've seen more and more apps and features become available. It's worth mentioning that being able to enjoy some of these in full depends on the country you're in and whether you have the proper cable subscription. So, power on your Apple TV and let us know in the comments how you're liking the fresh content thus far
Via: Engadget
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Fingerprint Digital provides safe kids apps for Samsung tablets
The network will offer safe apps and games with an educational twist for kids ages three to seven. The partnership is a big endorsement by the South Korean electronics giant for Fingerprint’s fledgling safe and educational kids app service.
Fingerprint will customize its mobile app service for Samsung’s own select devices. The service will debut in Southeast Asia and Oceania in the first quarter of 2014. Like Fingerprint’s other kids services, it will offer a safe and fun environment for kids to play games and learn. Parents will be able to create a family account for multiple children and receive personalized reports on activity. They can also get content recommendations and control access for each child.
On top of that, Fingerprint is earmarking $1 million to support the integration and localization of kids’ apps and interactive books globally. The company will give that money to developers to help increase the quality and quantity of kids’ apps.
Samsung’s network will be part of its Kids’ Play-and-Learn Content Initiative, which is focused on developers.
“We are very excited about partnering with Fingerprint,” said Nicholas Wodtke, vice president of content and services at Samsung Electronics Media Solution Center Southeast Asia and Oceania. “Asia has a young demographic base and a rapidly growing middle class. There are an estimated 50 million kids in the age group of 3-7 years in Southeast Asia. Samsung is focused on bringing to market a service that offers a safe mobile play and learn environment for kids.” 
The service will be called the Samsung Kids’ Mobile Network Powered by Fingerprint. It is part of Samsung’s global effort to deliver content and services that improve the user experience on its devices.
Source : VentureBeat
 Image : Fingerprint Digital
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Now that Kim Dotcom's cloud storage service Mega is available to the public, it's finally found time to launch the iOS app it's been promising. 

The new app includes many of the same features as its Android counterpart, which has been available on Android for more than four months, including file previews and easy sharing. It currently lacks automatic camera syncing but that will come, along with iPad support, in a future update. What's next for Mega? It's on course to launch its Sync tool for Windows, Mac and Linux in the coming weeks, giving it time to concentrate on adding new security and messaging features to the cloud service in the new year.
Via :  Mega Blog , Engadget
Source :  Mega (App Store)
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24me

iOS; free
Often the challenge is not executing your to-do list, it’s creating the list in the first place.24me solves that problem by automating the process. With help from the Check.meservice, 24me integrates with hundreds of U.S. banks and thousands of utility and service providers such as Comcast and AT&T. By accessing your accounts, it will determine when your bills are due and populate your calendar with reminders. 

Shifu

Android; free
The problem with to-do lists is that you have to remember to look at them and keep them updated. Shifu uses your location and phone usage patterns to proactively push reminders to your screen at the right moments.
You can set reminders based upon your Wi-Fi connection, location, who you’re talking with or how much time you have. For example, you can have Shifu remind you to download apps, movies, or music the next time you connect to your Wi-Fi network, or to pick up printer toner the next time it sees you’re at Best Buy.

Assistant

iOS, Android, and Windows Phone; free
Assistant stands out if you prefer using voice commands and responses. The app can brief you at the same time every day on upcoming calendar events, current news headlines, and even the weather.
Tell Assistant you want Mexican food or pizza, and it will summon Yelp listings according to your location. It’ll even read the names of the restaurants, tell you the star ratings, and let you know the distance from your location. Just tap a mute button when you’ve heard enough.

Sherpa

Android; free
“Ask and ye shall receive” pretty well describes Sherpa. You can tell Sherpa to send someone a text message or post to Facebook or Twitter. Ask it to update you on current events, and it pushes you to Google News. Enquire how a particular NFL team is doing and it will audibly share the final scores from the most recent game. You can have Sherpa notify you when your favorite teams score and when social media activities arise, such as Facebook friends’ birthdays and mentions on Twitter. It will also tell you when the weather is getting worse and let you know when you miss a call.

Mynd

iOS; free
Mynd is a context-aware calendar iOS app with a beautiful user interface. Using location awareness, it can automatically associate places with tasks or events. For example, if it detects your phone is always at the gym when your calendar says “spin class,” Mynd will add your gym location to all your spin-class dates.
How is this helpful? Transit time, for one thing. If it’s 4:30 p.m. and your spin class is at 5:30, but Mynd knows heavy traffic will extend your drive time to 35 minutes, it will calculate how much earlier you have to leave and adjust its alerts accordingly.
Source : PCWorld
Image : PCWorld
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The New York Times (NYTimes.com) today launched on Google Play Newsstand, Google's news reader app for Android phones and tablets offering newspapers, magazines, blogs and other sites. Users of Newsstand will have access to the latest news and award-winning journalism of The New York Times, designed and formatted for optimal reading on Android tablets and phones. 

The Times on Google Play Newsstand is an extension of the NYT Everywhere strategy, which is designed to expand The Times's reach to users on third-party platforms. The launch also demonstrates The Times's commitment to Android, where users can already access Times content via its Android app, Flipboard for Android and the web. 

Following authentication within Newsstand, Times subscribers will have full access to content including full articles, videos, photo slideshows and blogs.
To mark the launch, The Times is raising the article limit for non-subscribers using Newsstand to 15 articles a day from Nov. 20 to Jan. 5. Like with other mobile applications, non-subscribers will have access to up to three articles each day after Jan. 5.
The Times is offering a special monthly rate of $15 for a subscription to NYTimes on Newsstand, which includes access on phone and tablet devices. A free 30-day introductory period is included in the subscription price.
"With the launch of Google Play Newsstand, we are able to expand our NYT Everywhere strategy even further and reach readers where they want to access our premium digital content," said Denise Warren, executive vice president, digital products and services, The New York Times. "By raising the article limit through the holidays, Newsstand users who may not yet be Times subscribers will get a significant sense of the depth and authority of the news, opinion and multimedia offerings available on NYTimes.com."
Source : WSJ

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Instagram has arrived on Windows Phone 8, although some have slammed it as a "half-baked" effort.
The Instagram app that Nokia announced was coming at its Nokia World conference last month has finally landed, although it is very much still work in progress, appearing in the Windows Store as Instagram Beta.
The Beta tag lets users know that they shouldn't expect all the bell and whistles of Instagram's iOS and Android apps. At present, video capture and video upload are both missing from the Instagram Windows Phone 8 app, as are photo and location tagging.
Instagram said that it wanted to get the app out to users as quickly as possible, so a few features had to be left out of the first iteration.
Still, we've got Instagram up and running on our Nokia Lumia 1020, and all of the other features you'd expect are present in the app. There's the ability to upload an image from Camera Roll, or to turn the app into a camera lens, a feature that many thought was missing due to the odd button placement in the app.
All of the usual filters are present in the app, including XPro-II, Earlybird, Rise, Amaro, Hudson, Lo-fi, Sutro, Toaster, Brannan, Inkwell, Walden, Hefe, Nashville and 1977, as are linear and radial tilt-shift options for blurring images and the option to comment on images of your friends' dinners.
Instagram Beta is available to download for free from the Windows Store, and although it is missing a number of features it has already received a four and a half star rating from keen downloaders.
The arrival of Instagram sees Microsoft further boosting its Windows Store with more big name apps, with the hipster photo sharing app coming out just days after Twitter's Vine and Channel 4's 4OD TV catch-up service. Waze is also now available on the Windows Phone 8 mobile operating system, and Microsoft claims that more popular apps will be arriving soon.
Source : The Inquirer
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We've been hearing/seeing/talking about Newsstand for the past several weeks, and it's officially live as of now. As expected, the app takes the place of Play Magazines, but it also replaces Currents as a news reader. It's basically becoming the go-to place for news, magazines, and online feeds. Everything you want to read all in once place. That's cool.

You can hit up the latest publications in the Play Store, including the New York Times, WSJ, and a lot more, browse the magazines section, or just add your favorite site's feed quickly and easily. And FINALLY, there's a way to bookmark stories to save them for later. I haven't had a chance to dig in yet, but I really hope this feature applies to stories within magazines as well. Will update once I've had time to check that out.

Source : Android Police
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‘Cute Spotify‘, by Mike Sheldon, and currently under development, uses freely accessible APIs to power the native app – created using the Ubuntu SDK. 
Spotify already provide an official, native desktop client for the Linux desktop.
Music playback, album art, and other core features are present and working in Sheldon’s app. Unfortunately for music fans, getting the player installed isn’t nearly as simple as using it.
The app is not yet available from the Apps Scope, requiring manual compiling and a custom Spotify API key to be set prior to installation – something out of the reach of regular users.
But, with it being early days for both the app and the platform it’s aimed at, such barriers to entry can be overlooked.
You can see Cute Spotify in the video below.

Unofficial Importance

While Cute Spotify is an “unofficial” app – it is neither formally endorsed or authorised by the service it’s supporting – the creation of it is, nevetherless, an important milestone.
Source : OMG Ubuntu
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It’s official: Instagram now has ads, and the first one appeared Friday courtesy of fashion designer Michael Kors.
A colorful image of a luxury watch sitting on a table appeared on the photo-sharing app Friday, an Instagram spokesman confirmed. It was shown to women in the U.S., regardless of whether they were following the brand.
Instagram began testing ads last week, but the Michael Kors post is the first branded advertisement to officially run on the service. More ads are on the way, Instagram said, but the company did not specify when or how often.
Facebook bought Instagram last year for roughly $1 billion, when the app had practically zero revenue. Since then Facebook has made significant progress in monetizing its own site on mobile, and Instagram appears to be its next area of focus. The aforementioned ad trial on the app encompassed 10 different companies, Facebook Chief Operating Officer Sheryl Sandberg said earlier this week during the company’s third-quarter earnings call.
Ads on Instagram will be labeled as such with the word “Sponsored” in the upper-right corner. By clicking on the “...” in the lower-right corner, users can hide the ad after it appears, and provide feedback to Instagram about what they didn’t like about it. This feedback, according to Instagram, will let the app deliver more relevant ads to users.
Friday’s ad is a still photograph, but ads will also appear on Instagram in video form. The ads will be designed to fit in naturally with people’s feeds, Instagram and Facebook have said. “Ads should fit the format of the product they’re part of,” Facebook’s Sandberg recently said.
Compared to Facebook’s 1.19 billion monthly active users, Instagram is small, with 150 million active users, according to Facebook. But the app’s popularity is strong, so it could become a lucrative place for ads, if Facebook doesn’t drive away users in the process
Via: PCWorld
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Viber may have brought its most highly requested feature, VoIP calling, to BlackBerry users way back in April. Still, that's not to say the Skype competitor is quite done polishing its application on older versions of BlackBerry's OS -- namely, 5, 6 and 7. For starters, conversations have been enhanced with the ability to insert user images, while a new "seen" status lets you know when a recipient has viewed messages you've sent. Rounding up the update are some light design changes and improved location sharing/privacy settings, which allow folks to have more customization options throughout the app. Be sure to keep an eye on the BlackBerry World store, as this new version of Viber is expected be rolling out in the next few hours.
Via : Engadget.com
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Google's feeling a bit nostalgic lately: in fact, today is the company's 15th anniversary. However, its look at the past is a fleeting thing, and Big G is very much focused on the future. To that end, Senior VP of Search, Amit Singhal just revealed a host of new features for search. First up, tablet and mobile users will be seeing a new card-based UI that's been making its way across all of Google's services, and has defined the look of Google Now since its inception. In addition to providing a consistent brand appearance, the new look arrives in tandem with an improvement to the Knowledge Graph that delivers an easier way for folks to drill down on answers to their queries. For example, when searching for a particular band, a card will pop up at the top with a list of songs that you can scroll from side to side. In another example, search answered a comparison query with an expandable, columned chart card that displayed pertinent info about the two things asked to be compared. Plus, you'll be able to see other cards with web and other results at the same time, instead of needing to navigate between pages to see all the results.

In keeping with the updated aesthetics on Android, Google's also rolling out a new-look version of its iOS search app. The new app version will put users directly in a Google Now interface that'll feel familiar to Android users, and brings notifications, reminders and hotwording to Apple-philes. Furthermore, the search app is now cross-platform, so if you add a reminder in iOS, it'll show up on Android and vice-versa.

Lastly, Singhal let us know that Google changed its underlying search engine technology about a month ago. The new version's called Hummingbird, and the change was made to better answer the complex questions so many of us are asking Google these days. Since the switch, Hummingbird's been put to use in over ninety percent of worldwide searches and positions Google to stay on top of its game for the foreseeable future. It's the culmination of 15 years of work, but Singhal says it's just the next step in Search's evolution, so we can expect more of the same in the next 15.
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iOS 7 abolished many of the design paradigms of its prior versions in its main design, and that has filtered down to every major app built in to your device. But user interface isn’t the only thing that’s gotten an overhaul—some apps have new features as well as a new look. Here are some of the more minor stock app redesigns and updates in iOS 7.

Calculator

If you need your calculator apps to have skeuomorphic buttons and shiny entry fields, the new iOS 7 Calculator app (available for the iPhone and iPod touch only) may disappoint you: Apple has re-skinned the entire program to be smooth and flat, using colors and shades to differentiate the number pad.
The scientific calculator gains several new functions in iOS 7.
Apple has opted to remove the memory buttons on the calculator in portrait view; instead, you get a larger number pad and a percentage function—good for calculating quick tips. Landscape view, as always, brings you into scientific calculator mode, where Apple has added a few new functions. The lineup now includes buttons for the square root, cubed root, and Euler’s number functions.
You can also access the Calculator app more quickly in iOS 7, as Control Center has a built-in shortcut button.

Clock

Not only does the Clock app pick up a nice redesign in iOS 7, it also sports a few useful upgrades to each of its features.
World Clock On the iPhone, you tap the screen to switch from clock to numerical time view; previously, you could view both at once. The clock instead uses that extra screen space to keep track of time changes—underneath each city, you get a readout that lets you know how far ahead or behind you are in comparison with the other cities on your list.
Check local times and weather from the Clock app.
The iPad sports sets of six clocks along the top half of the screen, with a world map along the bottom showing all of your locations, their current time, and the current weather. You can tap on a clock face to see it full screen; here you can swipe between full screen clocks or pinch to return to the World Clock screen.
Alarm Though the Alarm tab itself has no noticeable changes, alarms now trigger in a slightly different way than in the past. When the screen is locked and an alarm goes off, you can tap your screen to snooze your device in addition to pressing the On/Off or Home button. When you do snooze an alarm, a lock screen notification appears with a Snoozing label and counts down the minutes remaining on your snooze (the default is ten minutes for the first snooze).
You can now tap anywhere on your device’s screen to snooze your alarm.
If you want to turn off the alarm entirely, you can slide to unlock your device as you normally would. On the iPad, you can drag alarms on the calendar like you would calendar events; when you let go, the alarm turns on.
Stopwatch There’s one small change in the Stopwatch tab—the stopwatch now goes to two decimal places rather than one.
The stopwatch is now more accurate in iOS 7.
Timer The Timer tab is virtually unchanged aside from its overall design, but, like the Alarm tab, it has a new lock screen action. Set a timer via Siri or via the Clock app, and then lock your phone, and that timer displays and counts down on the lock screen.
The timer ticks down even from the lock screen.
You can also quickly access the Timer tab through a shortcut button in Control Center.

Game Center

Game Center was perhaps one of the most ostentatiously skeuomorphic apps in iOS, with its green felt and burnished wood. In iOS 7, it’s gotten a complete reworking, with plenty of colorful bubbles and the same minimalist interface you’ll find throughout the rest of the OS. But in terms of new features, the list is pretty short.
Game Center’s new interface is far from green felt and wood, but still tries to convey an attitude of fun.
When you first launch Game Center in iOS 7, you’ll see a new profile screen with your status in a word bubble (tap it once to edit it) and a circular profile picture (tap this to choose a new one from your photos or to take a new picture on the spot). Large colorful bubbles show your number of games, friends, requests, challenges, and turns. Tapping any of those takes you to the relevant screen in Game Center; you can also use a toolbar at the bottom of the screen.
The only truly new feature in Game Center is Turns, a screen that shows all your current turns in games you’re playing, assuming those games are using Apple’s turn-based game system and not their own private system.

Passbook

While Passbook’s icon and opening screen get much-needed redesigns, the cards itself look very similar to their iOS 6 counterparts, with fewer light reflections. (The app is still only available for the iPhone and iPod touch, unfortunately.)
You can now receive Passbook passes via QR code.
In addition, Apple has moved the Welcome card from the bottom of the stack to the top and has relabeled it Passbook. A Scan Code link turns on your back camera so that you can scan QR codes to turn them into Passbook passes. (Unfortunately, you can’t use the scanner to scan QR codes that result in other sources, like URLs.)
You can share your Passbook passes, as well—tap the Share button on an individual pass to send it via Mail, iMessage, or AirDrop.

Stocks

Continuing Apple’s focus on redesign and simplification in iOS 7, the Stocks app (available on the iPhone and iPod touch only) gets a new mostly black interface, with white text and red and green highlights.
The Stocks app is relatively unchanged save for a sleeker black interface.
Functionally, the remainder of the app is identical—to add or edit stocks, you use the list icon instead of the info icon, but otherwise there are no changes.

Weather

The Weather app has a few new tricks up its sleeve in iOS 7, though it’s still only available for the iPhone and iPod touch. At first glance, the most obvious change is the animated photo backgrounds reflecting the weather conditions of whatever city you’re looking at. Apple has also revamped the way Weather presents information and how much data it makes available.
The new Weather app can give you a quick overview of temperatures and conditions in all the cities you track.
iOS 6 presented the current weather conditions in icon form, along with the current temperature and the high and low temperatures for the week; tapping the current day gave you an hour-by-hour breakdown. That information is all present in iOS 7, but Weather shows the hourly breakdown by default, as a scrollable horizontal list. The simplified iconography uses line drawings rather than more realistic-looking images.
Weather now offers more detailed information about the forecast at a tap.
However, in iOS 7, if you tap the current conditions and current temperature, you’ll get more information, including the current humidity, chance of rain, wind speed, and the “feels like” temperature.
The other major new addition is the list button in the bottom right—tapping it provides you with an overview of the weather conditions and temperature in all the locations you’re tracking. You can rearrange their order by tapping and holding on any of the locations and dragging it to a new position (your Current Location, if you haven’t disabled it in Settings > Privacy > Location Services, is always at the top.) A toggle button at the bottom of that list mode switches between Fahrenheit and Celsius, and a plus (+) button lets you search for and add a new location

Source : Macworld
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