Fundi runs in the browser, but added to your home screen it opens full-screen like an app: no address bar, plus a swipe to go back and a pull to refresh.
- On an iPhone, open Fundi in Safari.
- Tap Share (the square with an arrow pointing up).
- Choose Add to Home Screen, then Add.
On Android, open it in Chrome, tap the ⋮ menu and choose Add to Home screen (or Install app).
Sign in once in the newly installed app — the home-screen app keeps its own sign-in, separate from Safari.