Twinsubs
Which bilingual subtitle translator is best? Pick by what you do
The short answer: if you only watch online video in a browser, an extension such as Immersive Translate fits; if you have video or audio files and want a bilingual SRT made on your own Mac, plus live translation of the sound your computer plays, Twinsubs fits; if you need dubbing or to translate an existing subtitle file, a cloud tool such as Vozo or Maestra fits. Every fact on the 14 products below carries an official source and a verification date of 2026-10-16, and anything we could not find is marked not verified.
Pick by situation
| Your situation | Better fit | Why |
|---|---|---|
| You have video or audio files and want a bilingual SRT made on your own computer | Twinsubs, Subtitle Studio, SmartSub, VideoCaptioner | All process locally and output SRT; Twinsubs and Subtitle Studio are one-time purchases, the other two are free and open source but need setup |
| You want live translation of the sound your computer is playing | Twinsubs, Transcrybe | Both run on the Mac; Transcrybe states a one-time $29.99, and a Twinsubs purchase also covers file subtitles |
| You watch YouTube or Netflix in a browser and want a bilingual layer | Immersive Translate, ViiTor, Language Reactor | Extensions work as soon as you install them and make no file; Language Reactor leans toward language learning |
| You already have an SRT or VTT and only need it translated | Maestra | Its page says you can upload a subtitle file, in more than 125 languages |
| You need dubbing, voice cloning or lip sync | Vozo | That is most of what the Vozo page is about, and Twinsubs does none of it |
| You process one video now and then and do not want to install anything | The free tiers of Auris AI, Maestra or Vozo | Cloud processing with time or count limits on the free tier; your video is uploaded |
| You need subtitle burn-in, styles or an editor | Subtitle Studio, or a video editor | Twinsubs only outputs SRT files, with no burn-in and no editor |
| You already pay for CapCut and do your subtitles there | CapCut | Using the plan you have is simplest; there is no reason to switch |
Facts on 14 products (verified 2026-10-16)
| Product | Form | Where it runs | Price | Bilingual subtitles | Live translation | Export SRT |
|---|---|---|---|---|---|---|
| Twinsubs | Mac app (on the Mac App Store) | On your Mac, nothing uploaded | Free for the first 10 minutes of each video and 10 minutes of live translation per day; one-time purchase removes the limits | Yes, translation above the original (order can be swapped) | Yes, the sound playing on your Mac; works offline once the language packs are downloaded | Yes, a bilingual file and a target-only file |
| Immersive Translate | Browser extension (Chrome, Edge, Safari, Firefox) plus a web app | Translation requests go through its service; whether a video file is uploaded: not verified | Free users and a Pro plan; free users have a daily request limit, Pro price: not verified | Yes | Yes, in the extension, on online video platforms | Yes, the page says bilingual files can be exported as SRT or ASS |
| ViiTor | Chrome extension, plus an App Store app | Not verified (the store page does not say) | The store title says free; membership and limits: not verified | Yes (the store title says real-time bilingual subtitles) | Yes, in the browser | Not verified |
| Vozo | Cloud web tool, plus a mobile app | In the cloud (you upload the video; the page says up to 2 hours) | Free $0 (videos up to 20 minutes); Creator $29 a month; Studio $99 a month; higher tiers up to $649 a month | Yes (add translated subtitles) | No (not on the page) | Not verified (the page says subtitles are customizable) |
| Maestra | Cloud web tool | In the cloud (you upload the file) | Transcription pricing: pay as you go $12 per 60 minutes; Lite $23 a month on annual billing (180 minutes); Basic $39; Premium $79; subtitle translation billing: not verified | Yes (subtitle translation) | The vendor has a separate live translation product; not verified here | Yes (the page says SRT and VTT are accepted and exported) |
| Auris AI | Cloud web tool | In the cloud (you upload the video) | Free: 15 minutes a month, 1 file export a month, with a watermark; 30-minute top-up $1.8; paid tiers: not verified | Yes (add to the same video) | Not verified | Not verified |
| Transcrybe | Mac app | On your Mac; the site says audio stays on the Mac with no servers | 60-minute free trial, then $29.99 one-time lifetime licence | Yes (translated captions, several target languages on one screen) | Yes, its core feature | Not verified (the site does not mention subtitle files) |
| Subtitle Studio | Desktop app for Mac (Apple silicon) and Windows | On your computer, offline | $69 one-time perpetual licence; free to download and try, exporting needs the upgrade | Yes (translation with a local LLM or your own API key) | Not verified (not on the site) | Yes, and Final Cut Pro native captions |
| VideoCaptioner | Open-source desktop tool and CLI (Windows installer, macOS one-line script) | Whether the free recognition and translation path goes online: not verified (the README does not say); the large-model features use your own API key | Free and open source (GPL-3.0); model features cost whatever your provider charges | Yes | No (not on the page) | Yes (outputs SRT) |
| SmartSub | Open-source desktop tool (Windows, macOS, Linux) | Transcription on your computer (the README says files do not leave the machine); translation can use Bing, Google, Youdao or a large model, so network use depends on the choice | Free and open source (MIT) | Yes | No (not on the page) | Yes (subtitle files) |
| Language Reactor | Chrome extension, desktop browsers only | Not verified | A Pro mode exists, price: not verified | Yes (dual subtitles on streaming sites and YouTube) | No (not on the page) | Not verified (not on the page) |
| MacWhisper | Mac app | On your Mac; the site says offline, local models | Free; Pro one-time payment (EUR 64 as read on 2026-10-10; the pricing page is dynamic and was not readable today) | Not verified | The site lists system dictation and recording meetings; live translation: not verified | Yes, the site lists .srt and .vtt (read 2026-10-10) |
| CapCut (desktop) | Video editor | Not verified | Free and paid plans; see the pricing page | Not verified | Not verified | Not verified |
| macOS Live Captions | System feature | On your Mac (Apple silicon, per Apple) | Included with macOS | No | Transcribes only; the Apple support page does not mention translation | No |
“Not verified” means the official page has no clear statement, or the answer sits in dynamic content we could not read; it does not mean the feature is missing. We did not sign up for any account or try any paid feature.
One line on each
- Immersive Translate：Immersive Translate is a browser extension whose strength is putting bilingual subtitles on more than 60 online video platforms as you watch. See the alternative page
- ViiTor：ViiTor is a Chrome extension that adds real-time bilingual subtitles to online video, and its store listing says it is free. See the alternative page
- Vozo：Vozo is a cloud video translation platform whose strengths are dubbing, voice cloning and lip sync, with subtitles as one feature among them. See the alternative page
- Maestra：Maestra's subtitle translator can translate an existing SRT or VTT file directly, also accepts video and audio, covers more than 125 languages, and lets you edit before exporting. See the alternative page
- Auris AI：Auris AI is an online subtitle tool: you upload a video, pick the languages and add the second language to the same video, and the free tier gives 15 minutes a month. See the alternative page
- Transcrybe：Transcrybe runs on your Mac like Twinsubs, and its strength is live translation: it listens to the microphone or a chosen app, can show several target languages at once, has a 60-minute free trial and then a one-time $29.99 licence. See the alternative page
- Subtitle Studio：Subtitle Studio is an offline subtitle app for Mac and Windows with a one-time price of $69, and its strengths are the subtitle editor, style templates, burn-in and batch processing. See the alternative page
- VideoCaptioner：VideoCaptioner is an open-source (GPL-3.0) subtitle pipeline that runs recognition, line breaking, optimization, translation and burn-in in one command, and its strengths are that it is free and customizable. See the alternative page
- SmartSub：SmartSub is an open-source (MIT) desktop tool for Windows, macOS and Linux, transcribing with local models such as whisper.cpp, and its strengths are batch work, dubbing and automation. See the alternative page
- Language Reactor：Language Reactor is a Chrome extension for learning languages from Netflix and YouTube, and its strengths are word lookup, a dictionary and study tools on top of dual subtitles. See the alternative page
Also on the first screen, not checked one by one on this page
Links to their sites only; every fact about them is not verified.
- Tingdong：live translation on Mac, seen in Traditional Chinese and Korean results（not verified）
- Transync AI：live voice and subtitles on Mac, seen in three languages（not verified）
- Clideo video translator：cloud video translation, seen in four languages（not verified）
- Happy Scribe：cloud transcription and translation, seen in English and Japanese（not verified）
- Trancy：browser extension, seen three times in English results（not verified）
- Netflix Bilingual Subtitles：Netflix extension, first result in three languages（not verified）
- Live Subtitles：a Microsoft Store app for Windows only（not verified）
Twinsubs numbers
- On-device: works offline, tested on a real Mac with the network off on 2026-10-12; once the speech model and translation language packs are downloaded, recognition and translation need no connection.
- File speed: On our development Mac, one 10-minute English clip produced a complete SRT in about 55 seconds (measured 2026-10-09; your Mac and your video will differ).
- Free allowance: the first 10 minutes of each video and 10 minutes of live translation per day; a one-time purchase removes the limits, with no subscription.
Limits of Twinsubs, stated up front
- System requirement: macOS 26 or later, Apple silicon.
- It outputs SRT only: no subtitle burn-in, no built-in editor, no speaker separation, no ASS, and it cannot import an existing SRT and translate it.
- Machine recognition and translation make mistakes; with heavy accents, loud music or many specialist terms, check the result against the video.
- Which language pairs work depends on Apple's on-device translation; there are 12 source languages and 20 target languages.
How to check this yourself
- Read the other product's pricing pagePrices, plans and free allowances change; trust the page on the day you buy.
- Run the same clip through bothPick a clip with an accent and some technical terms; it tells you more than a spec sheet. The free version of Twinsubs covers the first 10 minutes of each video.
- Check the export formatConfirm you can export SRT and that your usual editor imports it without errors.
- Check where the data goesRead the other product's privacy policy to see whether video or audio is uploaded. Ours is the privacy policy.
Alternative pages
- Immersive Translate alternative
- ViiTor alternative
- Vozo alternative
- Maestra alternative
- Auris AI alternative
- Transcrybe alternative
- Subtitle Studio alternative
- VideoCaptioner alternative
- SmartSub alternative
- Language Reactor alternative
Sources (verified 2026-10-16)
- Immersive Translate video subtitles page · 2026-10-16
- Immersive Translate pricing page · 2026-10-16
- ViiTor on the Chrome Web Store · 2026-10-16
- ViiTor website · 2026-10-16
- Vozo video translator page · 2026-10-16
- Vozo pricing page · 2026-10-16
- Maestra subtitle translator · 2026-10-16
- Maestra pricing page · 2026-10-16
- Auris AI add dual language subtitles · 2026-10-16
- Auris AI pricing page · 2026-10-16
- Transcrybe website · 2026-10-16
- Subtitle Studio website · 2026-10-16
- VideoCaptioner on GitHub · 2026-10-16
- SmartSub on GitHub · 2026-10-16
- Language Reactor website · 2026-10-16
- MacWhisper · 2026-10-16
- CapCut (desktop) · 2026-10-16
- macOS Live Captions · 2026-10-16
FAQ
Which bilingual subtitle translator is best?
It depends on the situation: for online video in a browser, an extension such as Immersive Translate or ViiTor; for video or audio files turned into a bilingual SRT on your own Mac, Twinsubs or Subtitle Studio; for dubbing, Vozo; for translating an existing subtitle file, Maestra.
Is there a bilingual subtitle tool that processes locally without uploading video?
Yes. The Twinsubs, Subtitle Studio and SmartSub sites all state on-device processing, and the Transcrybe site says audio stays on the Mac. Cloud tools such as Vozo, Maestra and Auris AI need you to upload the file.
Is there one with a one-time purchase instead of a subscription?
Yes. Twinsubs is a one-time purchase (US$19.99), Subtitle Studio lists a $69 perpetual licence, Transcrybe lists a $29.99 licence after a 60-minute trial, and SmartSub and VideoCaptioner are free and open source.
Can anything translate the sound my computer is playing, as it plays?
Yes. Twinsubs and Transcrybe both listen to the sound your Mac plays and translate it live, and Twinsubs keeps working offline once the language packs are downloaded; browser extensions only act on online video inside the browser.
Can I translate an existing SRT file into another language?
Not with Twinsubs today, because its input is video and audio files. A tool such as Maestra can translate an existing subtitle file.
How reliable is the information on this page?
Every fact carries an official source and a verification date (2026-10-16), and anything we could not find is marked not verified. Prices and features change, so check the other product's own site before you buy; if you spot a mistake, write to twinsub@gatheon.com and we will correct it after checking.
Download free on the Mac App StoremacOS 26 or later, Apple silicon. Go to the App Store
Updated 2026-10-23. Back to the Twinsubs home page