Four of the companies in the Winter 2014 Y Combinator class, launching at YC Demo Day today, are also in Layer’s beta program. They’ve chosen Layer to help power rich communications in their apps and products, which span a broad spectrum from messaging apps to hardware devices, from events to healthcare, and are in both B2B and B2C markets.

Y Combinator companies such as Dropbox, Airbnb, Stripe, Reddit and Parse, as well as others, have all gone on to do great things, and we’re very happy to support four companies that are on stage today. Let’s hope that one of more of them makes Sam Altman’s (@sama) prediction about this batch come true:

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Best of luck to all YC presenters and we hope Layer can power a great communications experience for users in your apps, too!

Bellabeat – A smart wearable device for pregnant mothers that tracks heart rate, baby kicks and vitals for both mom and baby in-utero. Empowers women with information in between doctor appointments. Our blog post about them here.

eventjoy – An events platform that lets you create a unique app for every event. Eventjoy lets users send real-time messages and even create polls in the app. Go from creation to promotion in minutes. Free to start.

HoverChat – A very cool messaging app that enables true multitasking by allowing you to read and reply to incoming messages without ever leaving your current screen. Available for Android now.

Povio – A photo sharing app with a unique slant – send someone a ping, they reply with a photo and you have an annotated conversation inside the photo. They’re seeing crazy high retention – 55% of registered users in the US are coming back daily.