Subly

Live AI subtitles for any HTML5 video

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