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On-device Android talk-time tracker — measures how much each person speaks, no internet permission, no cloud. Kotlin/Compose + sherpa-onnx. GPL-3.0.
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Joan Marc Riera Duocastella 585c501a6d Talk Balance 0.1.3 — start-and-discover, on-device, open source 
Android app that measures who talks most, live, with no setup and no enrollment.
No internet permission, no audio written to disk. Kotlin/Compose + sherpa-onnx.
GPL-3.0-or-later.
2026-07-21 11:59:52 +01:00
app Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
bench-data Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
gradle/wrapper Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
spike Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
.gitattributes Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
.gitignore Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
build.gradle.kts Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
DECISIONS.md Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
gradle.properties Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
gradlew Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
gradlew.bat Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
LICENSE Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
PLAN.md Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
README.md Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
RELEASE.md Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
RESEARCH.md Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
settings.gradle.kts Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00
THIRD_PARTY_LICENSES.md Talk Balance 0.1.3 — start-and-discover, on-device, open source 2026-07-21 11:59:52 +01:00

README.md

Talk Balance

An Android app that measures how much each person talks — entirely on your phone.

Put your phone on the table at dinner or in a meeting. Talk Balance tracks how long each person speaks and shows a fair-share report at the end: talk share, turns taken, and the longest monologue. It's a friendly nudge toward more balanced conversations — not a surveillance tool.

Private by design

  • No internet permission. The app declares none — you can verify it yourself under Android Settings → Apps → Talk Balance → Permissions. It literally cannot upload anything: nothing you say ever leaves the phone.
  • No audio is ever stored. Speech is processed on the phone in memory (sherpa-onnx: voice-activity detection + speaker embeddings) and written nowhere — no recording file (verified on-device by inspecting the app's storage after a session). No cloud, no account, no per-use cost.

Install

Via F-Droid (recommended — you get auto-updates): add this repository to the F-Droid app (or Droid-ify / Neo Store):

https://fdroid.joanmarcriera.es/repo

Or scan the QR / tap "Add to F-Droid" at https://fdroid.joanmarcriera.es.

Direct APK: download the latest build from the same page. Requires Android 10+.

Status: early access (v0.1.1). Enrolment, the live session (coloured bars, current-speaker highlight, running leader) and the report all work on-device. It's young and still being tuned for real-world accuracy — built in the open, expect rapid iteration.

How it works

  1. Enrol each person once (a short voice sample, stored only on the phone).
  2. Run a session — the phone listens, detects speech, matches each utterance to an enrolled speaker on-device, and fills a live bar per person.
  3. Read the report — talk share, turns, longest monologue; share it as an image if you like.

A manual chess-clock mode (tap-to-pass, no audio) is planned for larger or noisier groups where automatic recognition is harder.

Build from source

Requires the Android SDK (platform 35+) and a JDK 17+ (Android Studio's bundled JBR works). Then:

./gradlew test assembleDebug

Release builds are signed from a keystore supplied via environment variables; without them the release build is simply left unsigned. See RELEASE.md.

Tech

Kotlin · Jetpack Compose · Room · sherpa-onnx (on-device VAD + speaker embeddings) · fully offline · minSdk 29 / target 36.

Licence

GPL-3.0-or-later. Bundled models and the sherpa-onnx runtime are Apache-2.0 / MIT — see THIRD_PARTY_LICENSES.md.

Built by Joan Marc Riera.