# YouSub

> Real-time subtitle translator for YouTube

Canonical page: [https://chrome-stats.com/d/yousub](https://chrome-stats.com/d/yousub)

## Overview

- **ID:** `yousub`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Masaru
- **Category:** language-support,photos-music-videos
- **Daily users:** 12
- **Weekly downloads:** 5
- **Version:** 0.2.2
- **Last updated:** 2026-05-14
- **First published:** 2026-04-25
- **Size:** 1.86 MB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/yousub/)
- **Website:** [https://gist.github.com/Masaru-urasaM](https://gist.github.com/Masaru-urasaM)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/yousub/privacy/](https://addons.mozilla.org/firefox/addon/yousub/privacy/)

## Description

YouSub translates YouTube subtitles in real-time using AI providers like Groq, OpenAI, Google Gemini, DeepSeek, Mistral, xAI, and OpenRouter.

Features:
  • Real-time subtitle translation with custom overlay
  • Support for 7+ AI providers — bring your own API key
  • Batch translation with streaming-like display
  • Subtitle sync engine that keeps translations aligned with video playback
  • Customizable overlay appearance (font, size, color, position)
  • Per-video translation cache to avoid re-translating
  • Works with any YouTube video that has subtitles/captions

No account required. Your API keys are stored locally and never sent to any third-party server.

## Rankings

- #30,971 — Overall

## Permissions and access

### Permissions

- `storage`
- `activeTab`

### Host permissions

- `*://*.youtube.com/*`
- `https://api.groq.com/*`
- `https://api.openai.com/*`
- `https://api.anthropic.com/*`
- `https://generativelanguage.googleapis.com/*`
- `https://api.deepseek.com/*`
- `https://api.x.ai/*`
- `https://api.mistral.ai/*`
- `https://openrouter.ai/*`
- `https://translate.googleapis.com/*`

### Content script matches

- `*.youtube.com`

## Safety

- **Risk impact:** Very high risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Request access to the following domains: youtube.com, groq.com, openai.com, anthropic.com, googleapis.com, deepseek.com, x.ai, mistral.ai, openrouter.ai
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

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- [Mira Translator - Web Translation](https://chrome-stats.com/d/mira-translator) — 47 users, 5.00 / 5
- [EasySubs](https://chrome-stats.com/d/easysubs) — 189 users, 3.88 / 5
- [Sublern — AI Translate Words in Video Subtitles](https://chrome-stats.com/d/sublern) — 177 users
- [Live Subtitle & Translator](https://chrome-stats.com/d/live-subtitle-translator) — 107 users
- [Dual Subtitles & AI Translation - InterSub](https://chrome-stats.com/d/intersub) — 1,435 users, 3.85 / 5
- [VoxSub](https://chrome-stats.com/d/voxsub) — 13 users, 5.00 / 5
- [Subtitles Translator](https://chrome-stats.com/d/subtitles-translator) — 36 users, 1.00 / 5
- [BilingualTube](https://chrome-stats.com/d/bilingualtube) — 79 users, 5.00 / 5
- [SubText](https://chrome-stats.com/d/subtext) — 15 users, 5.00 / 5
- [Youtube Dubbing](https://chrome-stats.com/d/youtube%E4%B8%AD%E6%96%87%E9%85%8D%E9%9F%B3) — 3,253 users, 3.92 / 5

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Source: [Chrome-Stats](https://chrome-stats.com/d/yousub)