Use Der Die Das as a (mobile web) app

I'm testing this little idea. It was easier for me to make it a polished web app than native apps for iOS and Android. However, there's a neat way how you can use Der Die Das almost natively on your smartphone.

iOS

1. Open Der Die Das in Safari
2. Tap Share (the middle button) in Safari's bottom bar
3. Select Add to Home Screen

Android

1. Open Der Die Das in Chrome
2. Tap on the hamburger menu in the upper right-hand corner of the Chrome window
3. Select Add to Home Screen

Now you can use it as a native app on your either iOS or Android phone. Offline isn't supported, though.