Tipsy App
Tipsy is a an web/native app for calculating tips and splitting dinner bills among friends. It integrates well with Venmo.
Contributing
More info can be found on the Ionic Getting Started page, but you'll need the Ionic CLI with support for v2 apps:
$ npm install -g ionic
$ cd path/to/tipsy
$ npm install
Now, go ahead and run $ ionic serve
to get started