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SubFlex - Smart Subtitle Controller & Sync

Chrome extension by ExtensionFlex · Productivity · Tools

A Chrome extension in Productivity · Tools with 2 users, barely installed.

Specific sites only: 2 match patterns.

What the developer says, and 4 screenshots

Loading from the Chrome Web Store. Open the listing if it does not appear.

Users
2
Rating
not rated yet
Users, last 3 days
+2
Version
1.1.0
Updated in the store
2026-09-14
Published
2026-09-12
Manifest
V3
Browser access
3 permissions, 2 site patterns

How it has moved

Users
+2 since 13.09
0-2 · 2 readings
2026-09-13: appeared in the store2026-09-14: released 1.1.0
  1. 2026-09-130appeared in the store
  2. 2026-09-152
Users
+2 since 13.09
0-2 · 2 readings
2026-09-13: appeared in the store2026-09-14: released 1.1.0
  1. 2026-09-130appeared in the store
  2. 2026-09-152

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing more than once a day and record a point only when something moves. History beyond ninety days is in the app.

What it can reach

Specific sites only: 2 match patterns.

  • https://api.opensubtitles.com/*
  • https://www.subtitlecat.com/*
  • Run its own code on the pages it can access scripting
  • Act on the current tab, but only after you click it activeTab
  • Store data in your browser storage

The full permission history for this extension

Version history

  1. Version 1.1.0

What changed recently

  1. Package size changed
  2. Released version 1.1.0 (was 1.0.0)
  3. Appeared in the store

The publisher

ExtensionFlex.

Like this one

Listings the catalog judges closest in what they say they do.

  1. Subtitle Overlay: Add Subtitles to Any Video Describes nearly the same job, smaller audience 2k users ★ 4.7
  2. Subby Describes nearly the same job, smaller audience 22 users ★ 5.0
  3. WebSubtitle – Add Subtitles to Web Videos Describes nearly the same job, smaller audience 86 users
  4. Subtitle Overlay: Add subtitles to videos and movies Describes nearly the same job, smaller audience 43 users
  5. SubMaker xSync Describes nearly the same job, smaller audience 234 users

The top 5 only. The full comparison, with why each one is close, is on the alternatives page; ranking a whole neighbourhood by your own criteria is in the app.

Is this your extension?

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See what the panel does

Figures come from our own daily pass over the public Chrome Web Store listing, last read on . We publish no contact details for extension developers.