ToneSub

Unknown author · Education

Open in Chrome Web Store

Users

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Avg rating

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Ratings

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Updated

Jul 23, 2026

Media

3 items

Description

Fast bilingual subtitles for YouTube videos, with automatic target-track and translation fallback. ToneSub adds fast bilingual subtitles to YouTube videos. It displays the original captions alongside a target-language translation, automatically preferring YouTube’s available target-language caption track and using a translation fallback when needed. Customize subtitle order, position, font, size, colors, background, and outline to match your viewing style. Optional DeepSeek BYOK AI enhancement is off by default. It only activates after you provide your own API key, confirm the in-extension data disclosure, and grant the optional permission. ToneSub works only on YouTube video pages. It has no ads, no account system, and no developer-operated backend.

History

30d 90d 1y all

rating_count is the Chrome Web Store ratings count, not a written-review count.

Details & SEO

SEO signals

Listing completeness signals

Title length
Characters in the extension name.
7
Description length
Characters in the listing description.
765
Media assets
Screenshots and videos on the listing.
3
Has promo video
Whether the listing includes at least one video.
No
Languages
Declared language locales.
3
Developer website
Listing exposes a developer website URL.
No
Contact email
Listing exposes a contact email.
Yes
Keyword in name
Case-insensitive substring match in the name.
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Keyword in description
Case-insensitive substring match in the description.
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Keyword occurrences in description
Count of case-insensitive occurrences in the description.
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Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
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These are transparent listing completeness / keyword signals, not a prediction of Chrome Web Store search ranking.