TtsReader is a cross-platform, offline TTS app built with Kotlin Multiplatform and Jetpack Compose, using the Kokoro TTS model through sherpa-onnx via JNI. It offers intelligent sentence-by-sentence speech with real-time highlighting — no internet or cloud required.

• 🖥️ Kotlin Multiplatform Desktop App (Jetpack Compose UI)
• 🎤 Offline TTS using Kokoro + sherpa-onnx + JNI
• 📖 Smart Sentence Playback: one sentence at a time with buffering
• 🔦 Live Highlighting: currently spoken sentence is highlighted
• 🌐 Chrome Extension Support:
  • Right-click selected text → “Play with TtsReader”

Download the prebuilt .msi:

• TtsReader.msi

• JDK 17+
• Git
• Chrome (for browser extension)

git clone https://github.com/ys-pro-duction/TtsReader.git
cd TtsReader
./gradlew run

(Optional) browser extension for sending selected text to the desktop app.

1. Download: chrome-extension.zip
2. Extract it
3. Open Chrome → chrome://extensions
4. Enable Developer Mode
5. Click “Load unpacked” → select extracted folder
6. Select text on any webpage → right-click → “Play with TtsReader”

https://addons.mozilla.org/en-US/firefox/addon/ttsreader-text-to-speech/

TtsReader desktop app must be running in the background.

• Text is broken into sentences using punctuation

• The app:

  • Plays 1 sentence at a time
  • Buffers the next 2 sentences for seamless delivery
  • Highlights the active sentence in the UI

• Playback uses native Kokoro ONNX models via JNI

First launch will download required models to:

~/.TtsReader/
├── model.onnx
├── tokens.txt
├── config.json

TtsReader — Read your text aloud, smoothly and intelligently, all offline.