ScaleSync OCR

Android app for importing body-composition scale screenshots into Health Connect.

This project is vibe coded.

Download Latest APK

App screenshot

Fastest way to use it

1. Download the APK.
2. Open the app on your phone.
3. Paste your Gemini API key once into the in-app field.
4. Connect Health Connect.
5. Pick a screenshot and save the values.

No local.properties setup is needed for normal APK users.

Languages

• English
• German
• French
• Spanish

The app switches automatically based on the device language.

Share it

• Share the GitHub release link if you want people to install the app directly.
• Share the repository link if you want people to inspect the code or contribute.
• Share the GitHub Pages landing page if you want a cleaner public entry point.

What it does

• Connects to Health Connect and requests the required write permissions
• Lets users enter their own Gemini API key directly inside the app
• Lets you pick a screenshot of a body-composition scale report
• Uses Gemini to extract the metrics from the screenshot
• Shows the extracted values in directly editable fields
• Saves the confirmed values to Health Connect using the current device time

Extracted metrics

• Weight
• Body fat percentage
• Muscle mass percentage
• Bone mass
• Body water percentage
• Protein percentage
• BMI
• Basal metabolic rate

Tech stack

• Kotlin
• Android ViewBinding
• Material 3
• Health Connect client
• Google Generative AI SDK for Android

Build from source

1. Copy local.properties.example to local.properties if needed.
2. Set sdk.dir to your Android SDK path.
3. Build the app with ./gradlew.bat assembleDebug on Windows.

Build a signed release

1. Copy keystore.properties.example to keystore.properties.
2. Generate or provide your own release keystore and keep it private.
3. Point storeFile, storePassword, keyAlias, and keyPassword to that keystore.
4. Build the release APK with ./gradlew.bat assembleRelease on Windows.

Permissions

The app requests write access for these Health Connect record types:

• Weight
• Body fat
• Lean body mass
• Bone mass
• Body water mass
• Basal metabolic rate

Notes on secrets

• local.properties is ignored by git and must not be committed.
• Generated build outputs are ignored by git.
• User API keys are entered in-app and stored only on the local device.

Project status

This repository is intended to be public-safe, but your local local.properties stays private on your machine.