The short answer
Dual subtitles means two lines under the picture at the same time: the original words and a translation beneath them. Learners use it to follow the story without losing sight of how the sentence was really said.
Neither platform documents it. YouTube's help pages describe turning captions on and picking one caption language, with Auto-translate for languages that are not listed. Netflix's help pages describe opening Audio & Subtitles while a title plays and choosing a subtitle language. Neither describes showing two subtitle tracks at once.
The usual route on both sites is a browser extension that adds a second subtitle line under the first, inside the browser. Fraze does the same job from the audio instead, so it also works on livestreams, calls and desktop players, where there is often no subtitle file to read.
What dual subtitles are, and why learners want them
- You can check a word you only half heard, instead of guessing at it.
- You see word order and idiom, not just the meaning.
- You stop rewinding and switching tracks.
One line in the language you are learning, one line in a language you already read, both on screen together.
What YouTube and Netflix offer today
| Two tracks at once | Where the text comes from | |
|---|---|---|
| YouTube | Not in the help pages | Creator captions or automatic ones |
| Netflix | Not in the help pages | Subtitles made for each title |
| Browser extension | Yes, on the sites it supports | Usually the site's own subtitles |
| Fraze | Yes, for any audio on your computer | The sound, transcribed on your computer |
Both players do let you switch. Google's help page says to click the Closed captions button to turn captions on. Its steps for choosing a language, given in the Android and iPhone tabs, are More, then Captions, then a language, with Auto-translate if the language you want is not listed. On a computer the caption menu is under Settings, then Subtitles/CC. Netflix's help page says to start playing, tap or click the screen, select Audio & Subtitles, and choose a language, or Other to see them all. Both describe choosing one subtitle language at a time.
Netflix also says a language can be missing because of your location, your profile language preferences, the title or the device, and that for some titles the reason is content licensing and show agreements.
How people get two subtitles at once today
For YouTube and Netflix the normal answer is a browser extension. It sits in your browser and draws a second language under the first, usually from the subtitles the site already has. Language Reactor is one example. Its Chrome Web Store listing says it adds dual language subtitles and a popup dictionary on the Netflix website, and that it runs in Chrome on Windows and macOS computers.
It has a real advantage over any live transcription, Fraze included. Netflix subtitles are made for each title, and on YouTube a creator can add subtitle files with timestamps, one language at a time. Subtitles prepared in advance are usually more accurate than anything listening to audio in real time, and they are already lined up with the picture.
The limits are just as real. An extension works only on the sites it was built for and only inside a browser, and most need the site to have subtitles to start from. Google says YouTube's automatic captions come from speech recognition and can misrepresent what was said, so on a video with no creator captions you are reading a machine transcript anyway. Google also says automatic captions for live streams are English only.
Where Fraze fits
Choose what it listens to
System audio catches anything your computer plays. On macOS you can pick a single app instead. The microphone covers a person in the room.
Pick the two languages
Fraze transcribes 25 European languages, and more on macOS 26 and later, including Japanese, Korean and Chinese. Translation covers about 50 languages to or from English, and other pairs go through English.
Switch the view to both
Each spoken line appears with its translation under it. Raise the text size, or switch to the floating caption window so it sits above the video window.
Fraze is a Mac and Windows app. It listens to what your computer is playing, or to your microphone, writes down each line as it is spoken, and puts the translation under it. The main window can show the original, the translation, or both, and the text size is adjustable. A small caption window can float above other windows.
Because it works from sound, it needs no subtitle file. That covers what an extension often cannot reach: a livestream, a video call, a lecture, a film playing in a desktop player, a site nobody wrote an extension for. Fraze is live only. It captions what is playing and does not take a file. Both steps, transcription and translation, run on your computer, nothing is uploaded, and after the first download of the language files it works with the Wi-Fi off. Lines land about half a second to a second after a speaker pauses.
When an extension is the better pick
- The Netflix show already has good subtitles in both of your languages. Read those. They were prepared in advance, and live transcription will rarely beat them.
- You watch on a phone, a tablet or a TV. Fraze runs on macOS 14 or later on Apple silicon and on Windows 11, and there is no mobile, TV or browser version.
- You want to click a word to look it up. Some extensions add a popup dictionary. Fraze writes lines and saves transcripts to your computer. It has no dictionary or word lookup.
Fraze is for the rest of your listening practice: the stream, the call, the lecture, the film with no subtitle track, the site the extension does not support.
What it costs
Every account gets the first 30 minutes free, with no card. After that it is $29.99 once or $2.99 a month, both unlimited. There is no per-minute meter. A free Fraze account is required and it carries the plan. It never sees your audio or your transcripts.
Questions
Does YouTube have dual subtitles?
Not as a built-in feature that Google documents. Google's help pages describe choosing one caption language, with Auto-translate for languages that are not listed, and nothing about two at the same time. People add the second line with a browser extension.
Can Netflix show two subtitles at once?
Not as a built-in feature that Netflix documents. Its help pages describe opening Audio & Subtitles and picking a subtitle language, and nothing about a second track at the same time. A browser extension is the usual way people do it, and it only works in a browser.
What is the best way to get dual subtitles?
It depends on what you are watching. If the site already has good subtitles in both languages, use them with an extension, because subtitles prepared in advance are usually more accurate than live transcription. If there is no subtitle file, or the video is not in a browser, Fraze builds both lines from the audio.
Can I get dual subtitles on a livestream or a video call?
Yes, with Fraze. It listens to whatever your computer plays, so a live broadcast, a Zoom, Teams or Meet call in any app or browser, or a talk in the room through your microphone all work. No subtitle file has to exist and no bot joins. In some places you have to tell people before you transcribe a conversation.
Can I use dual subtitles on my phone or TV?
Not with Fraze. It is a desktop app for macOS and Windows, with no phone, tablet, TV or browser version. On those screens, the YouTube and Netflix help pages describe a subtitle menu where you choose one language at a time.