With this app 'chatty', you can chat with real Native English Speaker to improve your English skill and use stamps for free. Chatty has passed 1,000,000 downloads on the app store and Google Play in total. I worked on iOS app and Android app design.
My role : User research, Prototyping, usability testing, UI Design, UX Design
Tools : Sketch, Adobe XD, Invision, Github, Atom
Timeline : 6 months (2015)