
ruff: a writing companion
A pocket-sized notepad you'll want to carry — ruff is a writer's best companion!
Third Culture Apps · ruff.ruff
- Signature matches the Google Play version Details
At a glance
- Latest version
- v2025.02.24 (176)
- Updated
- Aug 1, 2026 (2 months ago)
- APK size
- 17.8 MB
- Requires
- Android 5.0+ (API 21)
- CPU support
- ARM 32-bit, ARM 64-bit
- Category
- Productivity (app)
- Listed since
- Feb 19, 2021 (at least)
- Permissions
- 7 (1 sensitive)
- Website
- thirdculture.app/ruff
- Developer contact
- [email protected]
- Privacy
- Developer's privacy policy
About this APK
ruff: a writing companion is an app by Third Culture Apps in the Productivity category, listed since at least February 2021. It includes native code for ARM 32-bit and ARM 64-bit, so it runs on practically every phone.
Since version 2023.07.05, the APK grew from 14.4 MB to 17.8 MB. It asks for 7 permissions, 1 of them sensitive: modify shared storage. Compared with version 2023.07.05, it adds 2 new permissions: “Full network access” and “View network connections”. The app offers in-app purchases through Google Play.
What's new in v2025.02.24
Description
From the listing uploaded by “appupdater”.
Version history
2 versions are listed, going back to v2023.07.05.
Security & authenticity
Signing certificate
- Signature matches the Google Play version Checked by the source store on Aug 1, 2026.
- Certificate from Google Play App Signing Google keeps the signing key for the developer, so the certificate carries Google's name.
- Same certificate as the other version checked
Store checks and file details
- Developer signature verified Aug 1, 2026
- Validated against Google Play Aug 1, 2026
- Signed byCN=Android, OU=Android, O=Google Inc., L=Mountain View, ST=California, C=US
- Signing certificate (SHA-1)7E:C7:F1:1A:55:3B:D6:91:C9:15:81:FE:B9:EB:97:BB:1E:7D:D7:80
- File MD564d11e59d0779fa98f2dde05c0aadadf
- Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020
Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (1 other version compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.
Permissions (7)
ruff: a writing companion requests 7 permissions, 1 of them sensitive.
- Modify shared storage Sensitive android.permission.WRITE_EXTERNAL_STORAGE
- Full network access android.permission.INTERNET
- Google Play license check com.android.vending.CHECK_LICENSE
- In-app purchases (Google Play Billing) com.android.vending.BILLING
- Internal broadcast protection (app-defined) ruff.ruff.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
- Run at startup android.permission.RECEIVE_BOOT_COMPLETED
- View network connections android.permission.ACCESS_NETWORK_STATE
Required hardware & features
- Basic touch input android.hardware.faketouch
ruff: a writing companion APK: questions and answers
Can I install this APK over the version I already have?
Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.
Is ruff: a writing companion free?
The APK is free to download, but the app offers in-app purchases through Google Play.
Is the ruff: a writing companion APK safe?
No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the other version checked. After downloading, check that the file's MD5 is 64d11e59d0779fa98f2dde05c0aadadf.