Language Reactor Alternative on Mac: Dual Subtitles Beyond Chrome, Netflix, and YouTube

The short answer

If you watch Netflix or YouTube in Chrome, Language Reactor is hard to beat for language study: it shows two subtitle lines, adds a pop-up dictionary, and gives you precise playback controls. Keep using it there. The gap appears everywhere else. Its Chrome Web Store listing says the extension runs on Google Chrome on desktop and laptop computers, and it is built around the Netflix and YouTube websites.

When the video plays in Safari, in a desktop app, on a site the extension does not support, or as a livestream or podcast with no subtitle track at all, you need a different approach: generate the subtitles from the audio itself. Alison Workspace does this on a Mac. It listens to the sound your Mac is playing, recognizes the speech, and shows the original line with a translation underneath in a floating window that stays above any app.

The two approaches are not interchangeable. Language Reactor works from subtitle text the website provides; an audio-based tool works from what it hears. That difference decides which one to open for each video.

What Language Reactor does well — and where it stops

Language Reactor (formerly Language Learning with Netflix) is a Chrome extension with a large learner community. According to its Chrome Web Store listing, checked October 14, 2026, it adds dual language subtitles, a pop-up dictionary, and precise playback controls to films and series on the Netflix website, and it supports YouTube channels. It also has a mode for imported text and websites with machine translation and text-to-speech. The listing reports about two million users, and the extension offers in-app purchases for its paid features.

The same listing defines its limits:

• It runs in Google Chrome on Windows and macOS desktops and laptops, not in Safari or in native Mac apps.
• Its video features are designed for Netflix and YouTube pages rather than any site that plays video.
• It builds on subtitle text the platform supplies, so a livestream or video without a usable subtitle track gives it little to work with.

None of this is a flaw for its core use. If your study material is Netflix and YouTube in Chrome, the official subtitle text is usually more accurate than anything generated from audio, and features such as the dictionary are built for learning.

When you need dual subtitles from the audio instead

Learners run into the gap in predictable places:

• A video in Safari, or a course player embedded in a school or company site.
• A livestream on YouTube or Twitch, where the creator has not added captions.
• A podcast, internet radio, or an audio-only lesson.
• A downloaded video in QuickTime, IINA, or VLC with no subtitle file.
• A video call with a language-exchange partner.
• A streaming service's own Mac app, where browser extensions do not run.

In each case there is either no subtitle text, or no way for a browser extension to reach it. An audio-based tool does not depend on either. It needs only one thing: audio that macOS can make available to the app.

How Alison Workspace creates dual subtitles from what you hear

Alison Workspace sits in the menu bar. By default it captions the sound your Mac is playing, whichever app plays it. You choose the spoken language, or let Auto Detect follow it, and choose the language you want to read. The floating subtitle window shows the source line on top and the translation underneath. You can switch to source-only or translation-only display, change the font, size, color, and background, drag and resize the window, and turn on click-through so your clicks reach the video player behind it.

According to the Mac App Store listing checked October 14, 2026, it recognizes 100 spoken languages. Translation targets come from the Apple language resources installed on your Mac, up to 21 on a current system. Recognition and translation run on the device; there is no account, and audio is not uploaded or saved. Only text is kept, in a local history you can search, export, or delete. It requires macOS 15 or later and a Mac with Apple silicon.

Set it up for a language-study session

1. Install Alison Workspace and allow system audio recording when macOS asks. Microphone permission is needed only if you later choose microphone input.
2. Set recognition to the language you are learning, for example Spanish or Korean. If a video switches languages, Auto Detect can follow the change.
3. Set translation to the language you read most comfortably.
4. Keep the bilingual display, with the source line on top, so you read the target language first and glance down only when you lose the thread.
5. Place the subtitle window just below the video and enable click-through so it never blocks the player controls.
6. Add character names, place names, and recurring terms to the custom dictionary, or use hot words to bias recognition toward them.
7. Play a two-minute clip you already know and check that the lines match before starting a long session.

A study habit that works well: watch a short segment with both lines, replay it with source-only display, then export the session text from the history and review the sentences you missed.

Language Reactor or an audio-based tool: how to choose

Use Language Reactor when:

• The video is on Netflix or YouTube and you can watch in Chrome.
• The platform has subtitles in the language you are learning.
• You want word-level study tools such as a pop-up dictionary and saved vocabulary.

Use an audio-based caption tool when:

• You watch in Safari, a desktop app, or a site the extension does not cover.
• There is no subtitle track: livestreams, podcasts, radio, local files, calls.
• You want the same subtitle window across every app instead of one per site.

The two also work side by side: Language Reactor for Netflix and YouTube study sessions in Chrome, and an audio-based tool for everything else you listen to during the day.

Limits to know before you rely on it

Speech recognition is not a human subtitle. Fast speech, slang, music, background noise, and several people talking at once all lead to mistakes, and the translation can only be as good as the recognized sentence. For exact wording, a professionally made subtitle track is the better reference.

Live translation also follows the speaker. Alison Workspace keeps sentences whole instead of cutting them mid-thought; the translated line grows with the sentence and settles when the sentence ends, so expect a short delay compared with pre-timed subtitles.

Protected streaming content can behave differently. Alison Workspace works by listening to audio available to macOS, and some protected or DRM-controlled content may behave differently depending on the app, browser, system configuration, and content provider. Test the exact service and title before planning a study routine around it.

Finally, Alison Workspace is a caption tool, not a study suite. It does not have a pop-up dictionary or flashcards.

What it costs

Language Reactor's listing shows a free extension with in-app purchases; check its site for current Pro pricing.

Alison Workspace gives every new user 120 minutes of free live captioning and 60 minutes of free file transcription, and the live timer runs only while subtitles are being produced. After that, the US Mac App Store lists Pro at $4.99 per month, $29.99 per year, or a one-time $39.99 lifetime purchase, as of October 14, 2026. Prices vary by country.