LetterBox
ch.cryptobit.letterbox
android GPL-3.0-only kind 32267
Learn letters with animal pictures: a simple, offline game for young children
latest release
1.7.0
main
released 2026-10-22 18:44 UTC
download apk
ch.cryptobit.letterbox_9.apk · 5.8 MB
✓ signed
cert da270cf5…
about
- description
- LetterBox is a game for young children who are learning their letters. It shows a picture, usually an animal, and three letters. Tap the letter the word starts with. Tap the picture to hear its name. After a wrong answer, the same picture comes back so your child can try again. There are no scores, timers, or penalties. **Features** - Nine languages: English, German, French, Spanish, Italian, Polish, Brazilian Portuguese, Japanese (hiragana), and Korean (hangul). The language can be changed in the menu, independently of the system language. - About 70 pictures, with several pictures for many letters, so rounds stay varied. - Practise a selection of letters: all of them, the ten most common, or just one. - Optional progress tracking: letters your child knows well come up less often. Progress fades gently after a few weeks without practice, so forgotten letters return. - Works with a physical keyboard: press 1, 2, or 3, or the letter itself. - The menu button can be hidden until the app is closed, so small hands do not change settings by accident. Press and hold the top-right corner to bring it back. **Privacy** LetterBox requests no permissions and has no internet access. There are no ads and no tracking. Progress is stored only on the device and is excluded from cloud backups.
- publisher
- 78ce6faa72264387284e647ba6938995735ec8c7d5c5a65737e55130f026307d
- first seen
- 2026-10-09T15:20:07.763470+00:00
- last event
- 2026-10-22 18:44 UTC
- install
- zapstore.dev or any Zapstore-compatible client
- topics
- #educational game
source & build
- repository
- https://gitlab.com/muelli/letterbox
- arch flags
- android-arm64-v8a
- manifest
- missing
releases (kind 30063)
3 releases indexed; latest 1.7.0.
| version | channel | released | event |
|---|---|---|---|
| 1.7.0 | main | 2026-10-22 18:44 UTC | e397aa47… |
| 1.6.0 | main | 2026-10-12 14:11 UTC | 57924410… |
| 1.5.0 | main | 2026-09-14 08:53 UTC | 6d6f93de… |
assets & verification
Every app, release and asset event is schnorr-verified (NIP-01 id + signature) before it enters the catalog, and assets are content-addressed by sha256. We subscribe read-only to the catalog relay — never write to it.
1.7.0 — ch.cryptobit.letterbox_9.apk
- sha256
- ed46b77ebc6874adfee0a89e0f0c6006706c8d2e69307c385226274f2b03b0eb
- size
- 5.8 MB
- archs
- android-arm64-v8a
- version code
- 9
- apk cert sha256
- da270cf573a396c9462cbc46c4ad9ea8fd743335b1355c08b8d327aa281b246c
- download
- ch.cryptobit.letterbox_9.apk
1.6.0 — ch.cryptobit.letterbox_8.apk
- sha256
- abed720873684c42457651a6ace15ba656364043d0d88e78b3e3c0c7d943a216
- size
- 5.7 MB
- archs
- android-arm64-v8a
- version code
- 8
- apk cert sha256
- da270cf573a396c9462cbc46c4ad9ea8fd743335b1355c08b8d327aa281b246c
- download
- ch.cryptobit.letterbox_8.apk
1.5.0 — ch.cryptobit.letterbox_7.apk
- sha256
- 69a9f9175da5d58587cec8d90c020c9d5b3a175a1ad5295bf8c0ee4f0c8f0f8f
- size
- 5.7 MB
- archs
- android-arm64-v8a
- version code
- 7
- apk cert sha256
- da270cf573a396c9462cbc46c4ad9ea8fd743335b1355c08b8d327aa281b246c
- download
- ch.cryptobit.letterbox_7.apk
Showing the newest 3 asset descriptors; the full set is in /api/apps/78ce6faa…