# CaptionCatch

> Learn Japanese, Chinese, or English vocabulary as you watch. CaptionCatch reads the subtitles on YouTube and Netflix and shows one useful word at a time — with reading and meaning — from a fully offline dictionary.

Canonical page: [https://chrome-stats.com/d/captioncatch?hl=es](https://chrome-stats.com/d/captioncatch?hl=es)

## Overview

- **ID:** `captioncatch`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** NKaouri
- **Category:** language-support,photos-music-videos,games-entertainment
- **Daily users:** 1
- **Weekly downloads:** 2
- **Version:** 5.13.0
- **Last updated:** 2026-09-04
- **First published:** 2026-09-01
- **Size:** 20 MB
- **Data as of:** 2026-09-11
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/captioncatch/)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/captioncatch/privacy/](https://addons.mozilla.org/firefox/addon/captioncatch/privacy/)

## Description

CaptionCatch turns the subtitles you're already watching into passive vocabulary practice.

As a word appears in the captions on <strong>YouTube</strong> or <strong>Netflix</strong>, CaptionCatch picks one useful word from the line and shows it in a small running list over the video — the word, its reading, and its meaning — then moves on. No pausing, no lookups. You just watch.

<strong>Three source languages</strong>
- Japanese — tokenized with kuromoji, graded by JLPT level
- Chinese — segmented with jieba, graded by HSK level
- English — graded by CEFR level (CEFR-J + WordNet)

Show meanings in English, German, Spanish, or French. Set your level and how often words appear.

<strong>Fully offline dictionary</strong>
Word lookup runs entirely on your device — bundled tokenizers and graded word lists. No AI, no API, no account, works with no internet. CaptionCatch reads the caption text already rendered on the page; it never touches the video stream or subtitle files.

<strong>Also included</strong>
- Stats dashboard — streaks, a 90-day activity map, level and platform breakdowns
- Export learned words to an Anki-ready CSV
- Filter which word types you see (noun / verb / adjective / adverb)
- Light / dark / system theme, six overlay positions
- A running review list of every word you've seen

<strong>Free vs Pro</strong>
Free on YouTube (up to 120 words/day), all three languages, the overlay and review list. <strong>CaptionCatch Pro</strong> (optional subscription) adds Netflix support, unlimited words, the stats dashboard, Anki export, and the word-type filter.

<strong>Privacy</strong>
Your word history, settings, and stats stay in your browser — nothing is sent anywhere. The only network request is a periodic license check to Gumroad for Pro subscribers, sending only the license key.

## Rankings

- #91,514 — Overall
- #111 — captcha

## Permissions and access

### Permissions

- `storage`

### Host permissions

- `https://*.netflix.com/*`
- `https://*.youtube.com/*`

### Content script matches

- `*.netflix.com`
- `*.youtube.com`

## Safety

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

### Analysis details

- Request access to the following domains: netflix.com, youtube.com
- This extension was recently updated in the past month. New updates 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).

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Source: [Chrome-Stats](https://chrome-stats.com/d/captioncatch?hl=es)