Ad-free AI calorie tracker: Android app and browser PWA
Bring your own cloud AI key on either client. On the Android app you can also run Gemma 4 on-device. Fork of Fud AI with no ads and no analytics.
Website · Download · Web app · Privacy
Log food with a photo, voice, barcode, share intent, or typed note. Use your own cloud AI key, or download Gemma 4 once for on-device analysis in the Android app. No ads, no account, no analytics. Open diary and body-metrics exports on both clients; Health Connect for scales and wearables in the Android app.
Use the installable PWA in any modern browser (Chromium-based browsers work best for install, camera barcode, and speech) or the Android APK. Both use the same diary and body-metrics JSON contracts; there is no cloud sync between clients. Health Connect, widgets, notifications, on-device AI, and full i18n are Android-app features. Project home: codeberg.org/fitguy/chompass.
Open chompass.app/app/ in any modern browser (phone, tablet, or desktop). It is a progressive web app you can install to the home screen or dock. Diary logging, progress, BYOK AI entry and Coach, and shared JSON export/import with the Android app.
Works in Firefox, Safari, and other engines; Chromium-based browsers (Chrome, Edge, Brave, Cromite, etc.) generally have the smoothest install prompt, camera barcode, and Web Speech support.
Step-by-step install for iOS, Android, and desktop browsers: Download → How to install (also Settings → Install app inside the PWA).
Not on the Play Store. F-Droid metadata is submitted; until the package shows up in the F-Droid client, install from Obtainium or Codeberg Releases.
- Obtainium (recommended): tap the badge above, then confirm in Obtainium. Or paste
https://codeberg.org/fitguy/chompassinto Add App. - Direct APK: download from Codeberg Releases. Prefer
arm64-v8aon modern phones; usearmeabi-v7afor older 32-bit devices,x86_64for emulators/Chromebooks, or universal only when unsure. - F-Droid: package
app.chompass(expected listing once indexed).
Release package ID: app.chompass. Debug (from source): app.chompass.debug.
Material 3 dark theme (light theme also available). Images are in docs/screenshots/.
 Home: calorie ring, macros, meals |
 Progress: weight, steps, goals |
 Add food: photo, voice, barcode, AI |
 Coach: chat with your provider key |
 Settings: diet modes, Health Connect |
 Home (light): same dashboard, light theme |
Shared on the PWA and Android app unless noted:
- Food logging: multi-photo (up to 10), share into the app (Android), voice, barcode (FOSS zxing-cpp on Android; browser / Open Food Facts on web), text, manual entry, saved meals, draft recovery
- AI: cloud BYOK (a free Google AI Studio key is enough for casual use). On Android: opt-in On-Device (Private) Gemma 4 via LiteRT-LM, optional fallback provider. AI Coach chat on both clients.
- Progress: weight, body fat, measurements, forecast. Health Connect (Android): steps, exercise, wellness; two-way sync with Gadgetbridge, openScale, and other Health Connect apps
- Diet & extras: keto and other diet modes, water tracking. Android: home-screen widgets, 15 languages (web is EN-first)
- Open data: diary export (JSON / Markdown / CSV), weight and body-metrics import/export, bulk JSON import, meal share links (
chompass://on Android; hash URL on web) - Size (Android): ~15 MiB arm64 / ~27 MiB universal; no ads, analytics, or workout library (releases)
Chompass forked Fud AI in July 2026 when upstream briefly shipped AdMob banners (removed again in 3.0.3). This fork stays ad-free, ships an Android app and a browser PWA, keeps a smaller APK, and adds open export/import plus Health Connect. It does not try to match upstream feature for feature.
Priorities: privacy (PRIVACY.md), FOSS barcode scanning, open data, wearables via Health Connect, lean F-Droid / Codeberg distribution (Play flavor disabled; see docs/DISTRIBUTION.md), and a data-compatible PWA for any modern browser.
See CHANGELOG.md for release notes.
Android app. Settings → AI Provider → On-Device (Private) runs food logging AI on your phone. No API key, no account, and nothing sent to a cloud provider for text or photo analysis.
| Models | Gemma 4 Edge (E2B ~2.4 GB or E4B ~3.4 GB), downloaded once from Hugging Face |
| What stays local | Food text and photo analysis when logging meals |
| Requirements | arm64 or x86_64, 6 GB+ RAM (hidden on unsupported devices) |
| Accuracy | On-device models are much smaller than cloud AI and often misread portions, brands, and photos. Cloud AI is still the better default. |
| Fallback | Enable Fallback Provider so a cloud model retries when on-device inference fails |
Coach chat still needs a cloud provider. Added in v1.14.0.
Android app. Chompass uses Android Health Connect. No vendor SDKs, no accounts. Anything that syncs into Health Connect works with Chompass:
| Companion | What it brings | Notes |
|---|---|---|
| Gadgetbridge | Steps, exercise, weight from wearables | FOSS; enable Settings → External Integrations → Health Connect |
| openScale | Weight and body composition from Bluetooth scales | FOSS, on F-Droid |
| Samsung Health, Fitbit, Withings, etc. | Weight, activity, energy burn | Via each app's Health Connect sync |
| Direction | Data |
|---|---|
| In | Weight and body fat (live), meals from other apps, steps and exercise, sleep / resting HR / hydration, active/total energy burn |
| Out | Every meal as a full NutritionRecord, plus weight, body fat, and height |
Optional background sync (Settings → Health & Data, off by default) checks Health Connect every few hours when Chompass is closed.
Huawei Health users: pair your wearable with Gadgetbridge instead. Huawei Health Kit requires an HMS account and is not supported.
| Path | Steps |
|---|---|
| A: File export | In Fud AI, export your food diary as JSON. In Chompass (Android or web), open Settings → Import Food Diary JSON |
| B: Health Connect | Enable Health Connect in both apps and grant read permissions (Android) |
Settings → Import Weight & Body Data also accepts Chompass JSON/CSV, openScale CSV, and common weight CSVs. Body-circumference sites have no Health Connect record type, so use file transfer for those.
| Feature | Fud AI | Chompass Android | Chompass PWA |
|---|---|---|---|
| Banner ads | Brief AdMob; removed in 3.0.3 | Never shipped | Never shipped |
| On-device AI (Gemma 4) | No | Yes (opt-in) | No (BYOK cloud) |
| Barcode | ML Kit | FOSS zxing-cpp | Browser / OFF |
| Workouts library | Yes (~120 MB APK) | Omitted (~15 MiB arm64) | Omitted |
| Keto / diet modes | No | Yes | Yes |
| Health Connect | Partial | Steps, exercise, sleep, HR, hydration | No |
| Widgets / notifications | Upstream set | Yes | No (installable PWA) |
| Languages | Upstream | 15 | EN-first |
| Distribution | Play-focused | Codeberg / Obtainium / F-Droid | PWA in any modern browser (/app/) |
| Open diary / body JSON | Upstream formats | Yes | Same contracts as Android |
Sources: Fud AI releases, Chompass releases. Capability matrix for maintainers: docs/PARITY.md.
Chompass is BYOK, so accuracy depends on the model you pick. The app does not
claim a single number. We benchmark against labeled datasets and publish the
results. Typed entry is close to solved (5.7% WMAPE, 90% within ±20% of
true calories). Photo estimation is hard for every vision model tested
(best paid model: 32.3% WMAPE, 50% within ±20%), which is why a
portion-clarification feature is in progress. Full numbers and
methodology: docs/ACCURACY.md.
- Install size: no workouts bundle or ad SDK; arm64 ~15 MiB, universal ~27 MiB
- Food log I/O: monthly diary buckets for large histories
- UI: off-main-thread entry thumbnails; Progress screen worst-frame latency cut from ~1.1s to ~0.5s in our debug baseline
- AI uploads: image downscaling before provider requests
Guides, changelog, F-Droid draft metadata, and food-accuracy benchmarks live under docs/. Accuracy stats: docs/ACCURACY.md.
No ads, analytics, or tracking SDKs. Food logs, body metrics, and Coach chat stay on-device unless you export them or sync through Health Connect. Cloud AI requests go only to the provider you configure (BYOK). API keys are encrypted at rest (Android Keystore / EncryptedSharedPreferences on Android; Web Crypto AES-GCM in the PWA) and are not sent to a Chompass server. On-Device (Private) keeps food analysis on the device. See PRIVACY.md.
Chompass is based on Fud AI.
- Copyright (c) 2026 Apoorv Darshan - MIT License
- Modifications Copyright (c) 2026 fitguy - MIT License
See also NOTICE and ASSET_CREDITS.md.