Subly

Subly — Live AI Subtitles for Any Video

Add real-time subtitles to any video playing in your browser. Subly captures tab audio and transcribes it locally using AI — no cloud services, no subscriptions, no API keys.

FEATURES

- Live subtitles for any HTML5 video on any website
- Fully local transcription — your audio never leaves your device
- Powered by OpenAI's Whisper model running directly in your browser
- Translate to English mode — watch foreign-language content with English subtitles
- Translate to Turkish mode — get Turkish subtitles via Google Translate
- Supports Finnish, English, Swedish, and Turkish as source languages
- Customizable font size and subtitle position
- Works in fullscreen mode
- Three model sizes: Tiny (fast), Base (balanced), Small (best quality)
- WebGPU accelerated for near real-time performance

HOW IT WORKS

1. Play any video in your browser
2. Click the Subly icon and choose your settings
3. Click Start — subtitles appear within seconds
4. Click Stop when you're done

PRIVACY FIRST

All speech recognition runs locally on your device using WebGPU/WASM. No audio is ever uploaded to any server. The Whisper AI model is downloaded once (~75 MB) and cached in your browser.

Note: "Translate to Turkish" mode sends the transcribed text (not audio) to Google Translate.

REQUIREMENTS

- Chrome 116 or later
- WebGPU recommended for best performance (Chrome 113+)
- ~75-244 MB storage for AI model (downloaded on first use)

OPEN SOURCE

Subly is open source: github.com/geryit/subly