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Libellus Potionis

Privacy-friendly alcohol tracker: limits, BAC estimate, PDF reports.
New in version 0.84.0
A full review turned up several corrections. The drink editor's volume message now names the real limit of 5,000 ml instead of 10,000 ml. A Chinese language choice carried in a backup written on an iPhone survives the import. A new installation starts at 80 g per week over four drinking days.

The PDF report keeps the six most recent months and sums up everything older, its weekday columns follow the report's language, and day counts use each language's plural form.
Libellus Potionis is a privacy-friendly, free, open-source and ad-free alcohol consumption tracker that runs entirely offline. It requests no camera, microphone or location access and makes no network connections.

KEY FEATURES

• Logging: predefine your own beverages or pick from internationally common presets. Log drinks instantly or retroactively with precise timestamp corrections.
• Concurrent limits: set three boundaries at once — a daily limit (grams of pure alcohol), a rolling 7-day weekly limit (grams), and a maximum number of drinking days per week. Each has its own progress bar.
• Blood alcohol concentration (BAC): enter your body weight to get a live estimate from the Widmark formula.
• Counseling reports: generate a two-page PDF report of your consumption for consultations and counseling appointments.
• Data portability: export your dataset as a CSV file for external processing (e.g. in LibreOffice Calc), or create JSON backups to move data between devices.
• Adjustments: set your own "day start" time, so that late-night drinks count toward the preceding evening, and an evaluation start date for a clean restart.

A User's Guide is available inside the app.

PRIVACY & SECURITY

The app stores only what you enter. It holds no network permission, so it is incapable of network access and your data cannot leave the device by itself. 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. There is no tracking, no analytics and no cloud synchronization.

COMPATIBILITY

The app runs on Android 11 (API 30) and newer. It carries its own language selector, which works on every supported version, independently 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 available at the canonical repository: https://gitlab.com/godisch/potillus/
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Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid
  • Version 0.84.0 (95) suggested Added on Jul 31, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 11 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • de.godisch.potillus.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 4.4 MiB PGP Signature | Build Log

    • New in version 0.83.0
    Fixed: importing a backup with "Replace" now really replaces the drink list — the built-in preset drinks are no longer kept alongside the imported ones. Fixed: the Statistics and Calendar cards now have the same background as the rest of the app. The language list now offers "(System)", so a fixed language can be switched back to following the device language. And the overflow menu's About screen shows the version, the GPL notice and the licenses of the app's components.
  • Version 0.83.0 (94) - Added on Jul 21, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 11 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • de.godisch.potillus.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 4.4 MiB PGP Signature | Build Log

    • New in version 0.81.0
    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 0.81.0 (92) - Added on Jul 14, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 11 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • de.godisch.potillus.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 4.4 MiB PGP Signature | Build Log

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