Is Numbers & Letters safe?

Numbers & Letters is a mental arithmetic and vocabulary game, in the spirit of the well-known French TV game show of the same principle, with no affiliation to it. Two game modes: Numbers: 6 numbers are drawn along with a target to reach. Build your calculation step by step, calculator-style, combining the numbers with the 4 basic operations. Letters: 10 letters are drawn. Find the longest possib…

Developer: Pierre
Category: Puzzle Game
Earliest archived version: 08 Oct 2026
License: GPL-3.0-only (per F-Droid metadata)

02 / Release notes

Release notes from F-Droid

14 Oct 2026

1.133

French dictionary: conjugated verb forms removed. Hard letters (H, J, K, Q, W, X, Y, Z) are drawn less often in French. At the end of a round, the button to continue now replaces the Submit button. Streak and timed challenge trophies for 12 and 15 at Mathieu level moved up to Ruby and Diamond.

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12 Oct 2026

1.132

The app now falls back to English instead of French when the system language is not supported.

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08 Oct 2026

1.94

Daily reminder is now optional (dedicated setting, notification permission requested only when enabled); new profiles default to the phone's language.

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03 / Package identity

Technical fingerprint

Application IDfr.pierre.chiffreslettres

Latest APK SHA-25655adba599661d80e12cb33021bd993d9af8cc58277a3fa9e5c49d022b6ae8aaf

Signing certificate1D:86:31:CD:EB:AB:9A:63:9C:CE:75:65:1F:A0:39:D4:79:4F:B0:FA:17:5B:3E:19:18:02:99:41:F7:56:B8:B7

MIN ANDROID33TARGET36ARCHITECTUREarm64-v8a · armeabi-v7a · x86 · x86_64

04 / History

Archive history

3 versions in WIKI archive: earliest 1.94 (08 Oct 2026), latest 1.133 (14 Oct 2026).

No change in android.permission.* between 1.132 and 1.133.

05 / Version archive

Documented releases

3 TOTAL

VersionReleasedAndroidArchitecture

1.13314 Oct 202633+arm64-v8a, armeabi-v7a, x86, x86_64→1.13212 Oct 202633+arm64-v8a, armeabi-v7a, x86, x86_64→1.9408 Oct 202633+arm64-v8a, armeabi-v7a, x86, x86_64→

06 / Safety & access

Safety verdict

Authentic — file hash matches the source indexNo ads or tracking flagged by the source

IntegritySHA-256 verified vs source

SourceOpen-source · fdroid

Permissions12 declared · 0 sensitive

Signaturepresent

Anti-featuresNo known anti-features

Sensitive accessNo sensitive permissions

Declared permissions

android.permission.ACCESS_NETWORK_STATE android.permission.ACCESS_WIFI_STATE android.permission.BLUETOOTH_CONNECT android.permission.BLUETOOTH_SCAN android.permission.CHANGE_WIFI_MULTICAST_STATE android.permission.FOREGROUND_SERVICE android.permission.INTERNET android.permission.NEARBY_WIFI_DEVICES android.permission.POST_NOTIFICATIONS android.permission.RECEIVE_BOOT_COMPLETED android.permission.WAKE_LOCK fr.pierre.chiffreslettres.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Tracker status: Not assessed by WIKI for Android.

07 / Sources

Evidence ledger

Each entry is a captured public reference backing this record.

RepositorySource package page↗Source codeSource repository↗