ruff: a writing companion
v2025.02.24 · 17.8 MB · code 176
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File information
UpdatedNov 10, 2025
PublishedFeb 19, 2021
Packageruff.ruff
Versionv2025.02.24 (176)
Size17.8 MB
MD5610d6dfc8a0169a89dc1e151d0547eeb
Min SDK21
ABIsarmeabi-v7a, arm64-v8a
Malware scanTRUSTED
Signature SHA17E:C7:F1:1A:55:3B:D6:91:C9:15:81:FE:B9:EB:97:BB:1E:7D:D7:80
SignerCN=Android, OU=Android, O=Google Inc., L=Mountain View, ST=California, C=US
Total downloads100,000
This version100,000
DeveloperThird Culture Apps
Age ratingEveryone
What's new in v2025.02.24
Under the hood changes in preparation for a bigger update (ruff 2) coming later this year.
Security scan
TRUSTED
- Developer signature verified 2025-11-10
- Signature SHA1 7E:C7:F1:1A:55:3B:D6:91:C9:15:81:FE:B9:EB:97:BB:1E:7D:D7:80
- File MD5 610d6dfc8a0169a89dc1e151d0547eeb
How to install ruff: a writing companion v2025.02.24 on Android 5.0 Lollipop+
Takes about 2 minutes. You'll need roughly 17.8 MB of free storage.
- Grab ruff.ruff_176.apk — hit the Download button above (17.8 MB). If your browser warns about APK files, choose Keep or Download anyway — that warning fires on every APK, not just this one.
- Trust your browser to install — on Android 8+ go to Settings → Apps → Special access → Install unknown apps, pick the app you downloaded with (Chrome, Firefox, Files, etc.), and flip Allow from this source. On older Android, toggle Unknown sources under Security.
- (Optional) Verify the file — compute the MD5 of the downloaded APK and make sure it matches 610d6dfc8a0169a8…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find ruff.ruff_176.apk in your Files app under Downloads, then tap it. Android's package installer will appear.
- Check the signer — the install screen will name the publisher. For this build it should read CN=Android, OU=Android, O=Google Inc., L=Mountain View, ST=California, C=US. If it doesn't match, cancel — you have the wrong file.
- Review permissions & tap Install — scroll the permission list, then confirm. If Play Protect flags it, tap Install anyway (this APK was scanned as TRUSTED).
- Done — open ruff: a writing companion — tap Open on the install screen, or find the ruff: a writing companion icon in your app drawer (this build targets armeabi-v7a/arm64-v8a devices).
Common install errors for ruff: a writing companion
- "App not installed" — usually means an older or differently-signed version is already on your device. Uninstall it first, then retry. Your data may be lost unless you back it up.
- "Parse error" — the APK is for a newer Android than yours. This version needs Android 5.0 Lollipop or later. Pick an older build from the versions list below.
- "There was a problem parsing the package" — the download was interrupted. Delete the file and re-download over Wi-Fi.
- Works on one phone but not another — this build ships armeabi-v7a/arm64-v8a native code. Devices with a different CPU will reject it.