iPhone & iPad
Safari
- Open this site in Safari. On iOS, adding a site to the Home Screen is a Safari feature — other browsers may only save a bookmark.
- Tap the Share button in the toolbar (the square with an arrow pointing up).
- Scroll down the share sheet and tap "Add to Home Screen".
- Edit the name if you want to, then tap "Add".
Check it worked: Open it from the Home Screen. It should fill the screen with no Safari address bar at the bottom.
iOS can clear a web app's local cache after a long period without use. Nothing is lost — the app simply downloads its files again the next time you open it.