MOUNTAIN VIEW, Calif., Nov. 10, 2016 /PRNewswire/ -- OneSignal is a seed stage YC backed startup that makes it simple for developers to add free personalized push notifications to their mobile apps including iOS 10 media notifications, Android Rich Notifications, or to browsers via the new Web Push API specification. In addition, former MoPub/Twitter Exec Kevin Weatherman joins OneSignal as VP of Business Development. Today, OneSignal, a push notification platform aimed at mobile app and web publishers, is proud to announce reaching the impressive milestone of 1.2 Billion Devices, and 400M monthly unique users across over 130,000 Apps and Websites -- A 250% increase in 6 months. In addition, Kevin Weatherman has joined the team to lead business development, sales and client success. Kevin will also be starting OneSignal's New York office. OneSignal was started 2 years ago and initially focused on the mobile gaming market. Since then, OneSignal has been hard at work building a push platform for all mobile applications and websites. In April 2015, OneSignal was one of the first vendors to support the new Web Push API Specification, and has since become the market leader as online publishers adopt this new browser feature to send news and transactional messages to their visitors. YouNow reported that Web Push, powered by OneSignal, improved their 14-day website retention by 19% when measured in an A/B test. "Introducing Web Push was very easy to do and the impact was very clear. If you compare the amount of effort to the amount of impact, it was an unparalleled ROI to anything else we've tried." - Peter Watts, Growth and Special Projects, YouNow.com. With the recent release of iOS 10 notification attachments, Android 7's notification actions, and rapidly evolving Web Push API, it has become increasingly hard for developers to keep up with new features. Developers like Mic (mic.com), YouNow (younow.com) and ProductHunt (producthunt.com) rely on OneSignal's technology and support to deliver the best experiences for users.