We're really getting spoiled these days. There are great Android apps coming out all the time, but it can still be hard to find them amid all the clutter. The Google Play App Roundup is all about clearing the junk out of the way so you can find the best apps. Just click on the app name to go straight to the Google Play Store and pick up the app yourself.
Google has made a lot of cool APIs available to app developers, and many of them get a lot of use. One API that I think has gotten short shrift is Nearby. The Nearby API was announced about a year ago as a way for devices to talk to each other with a minimum of setup. Radon is a new app that makes sharing content between devices super-easy by using the Nearby API.
In case you're not aware, Nearby is a set of tools that can allow devices to pair and exchange information using Bluetooth, WiFi, and ultrasonic pulses. It's similar to the guest mode on the Chromecast in that it uses ultrasonic tones to pair with devices that aren't on the same WiFi network. You'll have to approve Radon to use Nearby services when you first start it. After that, you can simply share things to Radon from the system sharing menu.
Radon is not intended to push large amounts of data, so you'll be able to share things like links, videos, and so on. Radon opens when selected and begins looking for other devices in the vicinity running Radon. The receiving phone just needs to have the app open, and it'll start searching for a sender. When the devices spot each other, the content will be pushed over immediately. The app itself has a snazzy material UI with a purple and pink theme.
The main barrier to entry here is that both parties need to have Radon running. That means getting people to install it. The app includes quick links to the app and a QR code to help your friends get the app installed. Radon is free, and the lack of any signup process makes it at least feasible to get people on board.