A powerful YouTube transcript manager userscript with fuzzy search, AI-powered translation & summarization, and real-time subtitle overlay.

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Features

One-Click Transcript Extraction — Grab any YouTube video's transcript with or without timestamps
Fuzzy Search — Powered by Fuse.js, searches across titles, channels, tags, and transcript content with typo tolerance
AI Translation — Translate transcripts into 10+ languages via OpenRouter (supports any model: Gemini, Claude, GPT, etc.)
AI Summarization — Get instant video summaries with key points, main topics, and conclusions in one click
Subtitle Overlay — Display translated subtitles directly on the YouTube video player in real-time
Transcript Library — All transcripts are stored locally in IndexedDB with favorites, tags, and stats
Dashboard — Full management UI with history, favorites, translations tab, stats, and data export/import
Cost Tracking — See token usage and cost per translation via OpenRouter's generation API

Installation

From Release (Recommended)

Install Tampermonkey (Chrome, Firefox, Edge, Safari)
Download subscribe.user.js from the latest release
Open Tampermonkey dashboard and drag the file into it — or create a new script and paste the contents

From Source

bun install
bun run build

The built userscript will be at dist/userscript.js.

Development

bun run watch      # Rebuild on file changes
bun run typecheck  # Run TypeScript type checking

Usage

Once installed, you'll see new buttons on YouTube:

Navbar

Transcript Manager (document icon) — Opens the dashboard with your transcript library
Settings (gear icon) — Configure AI translation settings

Video Page

Transcript button — Extract and save the current video's transcript
Translate button — Translate the transcript and show subtitles on the video
Summarize button — Generate an AI summary of the video's content

Dashboard Tabs

| Tab | Description | |-----|-------------| | History | All saved transcripts with fuzzy search and filters | | Favorites | Bookmarked transcripts | | Translations | View and manage translated transcripts | | Stats | Total videos, tokens, words, channels, and more | | Settings | Export/import data, rebuild search index |

AI Translation Setup

Get an API key from OpenRouter
Click the settings (gear) button on YouTube's navbar
Enter your API key, select a model and target language
Click "Translate" on any video — subtitles will appear on the player

Tech Stack

TypeScript — Fully typed codebase
esbuild — Fast bundling into a single IIFE userscript
Fuse.js — Client-side fuzzy search engine
IndexedDB — Local storage for transcripts (no server, no accounts)
OpenRouter API — Multi-model AI translation & summarization with cost tracking
Trusted Types — CSP-compatible DOM manipulation

Project Structure

src/
├── index.ts              # Entry point, initialization
├── config.ts             # Constants and configuration
├── types.ts              # TypeScript type definitions
├── db.ts                 # IndexedDB wrapper (TranscriptDB)
├── transcript.ts         # YouTube DOM transcript extraction
├── search.ts             # Fuse.js search manager
├── ai.ts                 # OpenRouter translation & summarization logic
├── subtitle-overlay.ts   # Real-time subtitle display on video
├── router.ts             # YouTube SPA navigation handler
├── dom.ts                # DOM utilities and CSS injection
├── icons.ts              # SVG icon library
├── utils.ts              # Helper functions
├── trusted-types.ts      # Trusted Types policy
├── global.d.ts           # Tampermonkey API type declarations
└── ui/
    ├── navbar.ts          # YouTube navbar button injection
    ├── dashboard.ts       # Main dashboard modal
    ├── viewer.ts          # Transcript viewer modal
    ├── copy-modal.ts      # Copy & tag modal
    └── settings.ts        # AI settings modal

Contributing

Contributions are welcome! Feel free to open an issue or submit a pull request.

License

MIT

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Install / Use

README

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