Tears of the Kingdom · Great Fairy Fountains
Your checklist auto-saves in this browser, on this device (localStorage — no account, no cookies). It won't follow you to another phone or computer, and private/incognito windows or iOS Safari after ~7 idle days can wipe it — so export a backup if it matters, or to move it between devices.
⬇ Save to file exports a totk-armor-progress-date.txt file — in this app it asks you to confirm the save first; a hosted/installed copy drops it straight into your Downloads folder. ⬆ Load from file reads it back. If a file won't save, use ⧉ Backup code (copy the text somewhere safe).
Open this as a full-screen app on your device — no App Store, no download. Your saved progress carries over. Pick your device: