Inkpad

Fun historical note: Steve Sprang (1) added a T terminator to inkpad for ipad (2) developed originally under the company name Taptrix, which was in a YC'10 batch (3), after being his first app, Brushes, was an early smash success on the iphone (4), at my request the day he open-sourced it (5) because I wanted a T terminator for drawing biochemical pathway maps! (1) https://news.ycombinator.com/user?id=ssprang (2) http://inkpad.art/ (3) https://news.ycombinator.com/item?id=6665261 (4) https://www.macworld.com/article/198770/brushes.html (5) https://github.com/sprang/Inkpad/issues/22

I like Inkpad: https://github.com/sprang/Inkpad It is a high quality and popular vector drawing app (4+ stars on app store) and the code is clean and simple to understand. I am not sure you will learn anything by just reading through it if you're not building a similar kind of app though. Quick googling also yielded these lists: http://maniacdev.com/2010/06/35-open-source-iphone-app-store... http://en.wikipedia.org/wiki/List_of_free_and_open-source_iO... How to architect your app really depends on what kind of app you're building.

Is there a link to screenshots somewhere? EDIT: To answer my own question: https://github.com/sprang/Inkpad/tree/develop/Screenshots

I also open-sourced Inkpad, my iPad vector illustration app, a few weeks ago: https://github.com/sprang/Inkpad I'm planning to submit this version of Brushes to Apple within the next week or so. There are still a few outstanding issues. If you'd like to contribute, I'd appreciate bug fixes, new features, and localizations for your language of choice. Otherwise, I hope you can learn something from it, or find bits and pieces that are useful in your own apps.