Who should use CaptionCatch?

CaptionCatch is a consumer product built for Japanese, Chinese, and English language learners.

Does CaptionCatch have a free plan?

Yes — there is a free tier, with paid plans for advanced use.

What platforms does CaptionCatch run on?

CaptionCatch runs on the web and embeddable surfaces.

Is CaptionCatch still maintained?

Unverified. CaptionCatch has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What are alternatives to CaptionCatch?

Similar projects tracked by PulseGate include LEARN CHINESE WITH CHINABUBBLES PRO, English Learning, and Lingua League.

Who makes CaptionCatch?

CaptionCatch is developed by NKaouri.

How long has CaptionCatch been around?

CaptionCatch first shipped in 2026.

Back to the index

CaptionCatch

Name: CaptionCatch
Author: NKaouri

mozilla.orgLanguage learning

CaptionCatch is a Firefox extension that extracts useful vocabulary from YouTube and Netflix subtitles while users watch. It displays words, readings, and meanings in a running overlay using offline dictionaries, with support for Japanese, Chinese, and English learning levels.

FreemiumWebEmbeddableCloud-managed

Visit mozilla.org

Overview

10 features

CaptionCatch is a Language learning project. It focuses on learning vocabulary from video subtitles without pausing to look up words manually. It is built as a consumer product for Japanese, Chinese, and English language learners. There is a free tier. CaptionCatch is available on the web and embeddable surfaces.

It is developed by NKaouri, and it first shipped in 2026. Among its 10 catalogued features are subtitle vocabulary, youTube support, and netflix support. The interface is available in 32 languages, including Czech, German, and Greek.

Summary written by a language model from the project’s public pages.

Subtitle vocabulary
YouTube support
Netflix support
Offline dictionary
Word readings
Word meanings
JLPT levels
HSK levels
CEFR levels
Frequency controls

Built with & integrations

Runs on

BrowserEmbeddableCloud-managed

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed5 Sept · 02:34 UTC
CaptionCatch verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about CaptionCatch

What is CaptionCatch?: CaptionCatch focuses on learning vocabulary from video subtitles without pausing to look up words manually. It is catalogued under Language learning on PulseGate.
Who should use CaptionCatch?: CaptionCatch is a consumer product built for Japanese, Chinese, and English language learners.
Does CaptionCatch have a free plan?: Yes — there is a free tier, with paid plans for advanced use.
What platforms does CaptionCatch run on?: CaptionCatch runs on the web and embeddable surfaces.
Is CaptionCatch still maintained?: Unverified. CaptionCatch has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What are alternatives to CaptionCatch?: Similar projects tracked by PulseGate include LEARN CHINESE WITH CHINABUBBLES PRO, English Learning, and Lingua League.LEARN CHINESE WITH CHINABUBBLES PRO English Learning Lingua League
Who makes CaptionCatch?: CaptionCatch is developed by NKaouri.
How long has CaptionCatch been around?: CaptionCatch first shipped in 2026.

At a glance

Pricing: Freemium · pricing page detected
Platforms: Web
First seen: 5 Sept 2026
Built for: Japanese, Chinese, and English language learners
Model: B2C
Solves: Learning vocabulary from video subtitles without pausing to look up words manually.

Registered as

Firefox Add-ons: captioncatch

Developer

NKaouri

Index record

Indexed: 5 Sept 2026
Lifecycle: Alive
First seen: Sept 2026
Last seen: 5 Sept 2026

Identity audit (13)

Slug: captioncatch-mozilla-org
Lifecycle last checked: 8 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 5 Sept 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 5 Sept 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/captioncatch

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