Privacy-friendly alcohol tracker: limits, BAC estimate, PDF reports.
About this app
Libellus Potionis is a privacy-first, free, open-source and ad-free alcohol consumption tracker. It helps you monitor, pace and manage your drinking entirely offline. It needs no invasive permissions — no camera, microphone or location — and works completely without network access.
KEY FEATURES
• Intelligent logging: predefine your own beverages or pick from internationally common presets. Log drinks instantly or retroactively with precise timestamp corrections. • Concurrent limit tracking: set three simultaneous boundaries — a daily limit (grams of pure alcohol), a rolling 7-day weekly limit (grams), and a maximum number of drinking days per week. Visual progress bars keep you informed in real time. • Blood Alcohol Concentration (BAC) estimate: enter your body weight to get a live approximation based on the established Widmark formula. • Counseling reports: generate a clear, well-organized two-page PDF report designed for consultations and counseling appointments, summarizing your habits statistically. • Data portability: export your full dataset as a standard CSV file for external processing (e.g. in LibreOffice Calc), or create secure JSON backups to move data between devices. • Granular adjustments: customize your "day start" time so late-night drinks count toward the correct evening, and set custom evaluation start dates for clean restarts.
A comprehensive User's Guide is available inside the app.
PRIVACY & SECURITY
Libellus Potionis is built around absolute data sovereignty and strict data minimization. It runs under a minimal permission profile that completely excludes network access, so your personal data never leaves the device. Your data stays in the app's private storage, protected at rest by Android's device storage encryption and the app sandbox. An optional biometric fingerprint lock guards against unauthorized physical access. This offline-first approach eliminates tracking, cloud synchronization and external data leaks.
COMPATIBILITY
The app runs on Android 11 (API 30) and newer. A fully independent in-app language selector works across all supported versions, regardless of the system-level per-app language picker.
OPEN SOURCE
Libellus Potionis is free software released under the GNU General Public License v3 (or later). The source code is documented to a textbook standard and is available at the canonical repository: https://codeberg.org/godisch/potillus/
Licensed under GPL-3.0-or-later, by Martin A. Godisch.
What's New in v0.81.0
Imported from the F-Droid repository index.
- New accessibility options. The capacity indicator can now show a shape (cross, 1 or arrow) in addition to its colour — enable it under Settings → Appearance to help with red–green colour-vision deficiency. The statistics charts now provide a text description for screen readers. Also fixed: trend, monthly average and PDF abstinence figures now respect the statistics start date and the report period; date-picker timezone fix.
Version history
Jul 14, 2026 · 4.4 MB · Android API 30–36 · code 92
Imported from the F-Droid repository index.
- New accessibility options. The capacity indicator can now show a shape (cross, 1 or arrow) in addition to its colour — enable it under Settings → Appearance to help with red–green colour-vision deficiency. The statistics charts now provide a text description for screen readers. Also fixed: trend, monthly average and PDF abstinence figures now respect the statistics start date and the report period; date-picker timezone fix.
SHA-256 e7af078c3a1174f38c1e7502400a1004c57ba43f7553ed33ea51ed4b84bfe566
Jul 10, 2026 · 4.4 MB · Android API 30–36 · code 91
Imported from the F-Droid repository index.
- Backups now also include the app settings. A full restore (Replace) brings back the theme, limits, day-change time, body weight, language and more — previously only drinks and entries were restored. Merge keeps the existing settings and only adds data. Older backups still restore the history exactly as before.
SHA-256 789113a31df72f4578abb392c8935802f31dec45d0c808460f862810ba09b261
Jul 5, 2026 · 4.4 MB · Android API 30–36 · code 89
Imported from the F-Droid repository index.
- Screenshots and the feature graphic are now localized for every language, and the app's privacy policy is now published (in English): https://codeberg.org/godisch/potillus/src/branch/main/PRIVACY.md. In the app, export now shows a notice when the selected date range has no entries. Also a broad reorganization and cleanup of the code and build infrastructure; no other functional changes.
SHA-256 900d41c08cde93ba96bdea06106fe9c95bf67fa2a8e66fb6b3047082703d035f
Will it run on your device?
74%
- Targets newer Android builds, so legacy devices may be excluded.
- Multiple CPU architectures are covered.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be de.godisch.potillus is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 0.80.0 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Libellus Potionis first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Libellus Potionis, and a listing is removed when the evidence for it stops holding up.
Get Libellus Potionis
Every source we list for de.godisch.potillus is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
e7af078c3a1174f38c1e7502400a1004c57ba43f7553ed33ea51ed4b84bfe566
Signing certificate
7506f17184b31a2d67621305d190a73e497806b39f7d64463ff5dbc0afd8317b
Permissions Required
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
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