Written and checked by The Sada Team · How we check

A Language Reactor alternative for speaking practice

Choosing a tool alongside Language Reactor starts with the exercise you want to do. Sada provides browser practice with captioned YouTube lines, recording, and feedback on words and timing; it does not grade individual sounds.

Try one line nowListen to one short line, record your take, then play it beside the original. Free, with no account.

Last checked: 30 September 2026. Prices and limits change; confirm them on the tool’s own site or in your country’s store.

Does Language Reactor work on a phone?

There is no store app. Language Reactor staff wrote on 5 March 2026 that it has no mobile app for iOS or Android and that the website can be opened in a mobile browser at languagereactor.com. Its browser extension runs in Chrome on Windows and Mac computers, per its Chrome Web Store listing, and its home page says it works on your phone and tablet too (read 7 October 2026). Apps with “Language Reactor” in their name in the stores are not confirmed as made by Language Reactor; we found no statement from it that they are its apps. Sada runs in a phone’s browser for speaking practice.

An alternative for Safari, Firefox and Android

Sada is a web page, not an extension, so there is nothing to install. It works in Safari on an iPhone or a Mac, in Chrome on an Android phone, and in Chrome, Edge or Firefox on a computer. Open a captioned YouTube video in Sada, listen to one line and press Record. The first time, your browser asks for the microphone. Your recording stays on your device.

Sada does not add subtitles to YouTube or Netflix themselves. To see which browsers and phones each of the other tools supports, see the tables on this page, with the dates we checked them.

Language Reactor vs Sada

Compared on	Language Reactor	Sada
Main job	Understand Netflix and YouTube with dual subtitles and lookups	Practise saying a YouTube video’s lines
Listens to you	Its store listing describes no check of your speech	Yes: words heard, words missed, timing
Netflix	Yes	No, YouTube only
On a phone	No store app; the extension is for Chrome on a computer, and its site says it works on phone and tablet	Yes, in the phone’s browser
Price	Free features; Pro from €5.39 a month (shown to a visitor in Portugal, 3 October 2026)	Free, no paid plan

Language Reactor alternatives compared

Which alternative fits depends on what you want to do while you watch. Prices change by country and season, so this table says only whether there is a free tier; follow the links below for current prices.

Tool	Main job	Works with	On a phone	Checks your speaking	Free tier
Language Reactor	Dual subtitles and word lookups	Netflix, YouTube, imported text	Extension for Chrome on a computer; its site says it works on phone and tablet, with no store app	Not stated	Yes; Pro is paid
Trancy	AI bilingual subtitles and translation	YouTube, Netflix, HBO Max, Disney+, TED, Coursera, Udemy and more	iOS and Android apps; extensions for Chrome, Edge, Firefox, Brave, Arc and Safari	Yes: “AI Pronunciation Evaluation” in Premium	Yes; Premium is paid
Lingopie	A streaming service of shows for learners	Its own library of 5,000+ shows; a Chrome extension for select titles on Netflix and Disney+	iOS, Android and TV apps	Lists a “pronunciation coach” without saying how it works	No; 7-day trial
Migaku	Turns videos and web pages into flashcards	YouTube, Netflix, Disney+, Viki and more	iOS and Android apps; Chrome extension	Not stated	No; 10-day trial
Linglass	Dual subtitles and click-to-translate, with saved words turned into flashcards	YouTube and Netflix	Its app plays YouTube with two subtitle lines on iPhone, iPad and Android; Netflix needs the extension on a computer	Not stated; it plays each word’s pronunciation	Yes; Premium is paid
LingQ	Reading and listening lessons built from imported content	YouTube videos with captions, imported as lessons with the transcript	iOS and Android apps	Not stated	Yes, with 5 imported lessons; Premium is paid
Sada	Saying a video’s lines and checking them	Any YouTube video with captions	Yes, in the phone’s browser	Yes: words heard, words missed, timing	Free, no paid plan

In short: to understand Netflix with two subtitle lines, Language Reactor or Trancy; for two subtitle lines on YouTube in a phone app, Linglass. For a ready-made library of shows, Lingopie. For flashcards from what you watch, Migaku. To read and study a YouTube video’s transcript as a lesson, LingQ. To practise saying what you hear, on any phone and for free, Sada; it works well beside any of the others.

What Language Reactor does better

Understanding: dual subtitles, instant word lookups, playback controls, imported text, Netflix support and many interface languages (27 listed). If comprehension and vocabulary are your goal, keep it.

If you also want flashcards or Netflix

Sada is YouTube-only, with no flashcards and no vocabulary export. Language Reactor is the better tool for Netflix and for building vocabulary while you watch.

What Sada adds

Speaking. Sada splits a YouTube video into lines, plays each one, records you saying it with the speaker or after them, and shows which words were heard and how far behind you were — on a phone as well as a computer, with no extension and no account. Your recordings never leave your device.

Using both

On a computer, watch the video in Chrome with Language Reactor until you understand the line.
Open the same YouTube video in Sada, on your phone or computer.
Say the line after the speaker, then with the speaker, and compare your take. How to shadow a YouTube video.

Other comparisons

Sources

Checked 30 September 2026: Language Reactor on the Chrome Web Store (browsers, in-app purchases, 27 languages), staff reply on phones, Language Reactor Pro (prices), Language Reactor help (sites and devices). Read 7 October 2026: Language Reactor’s home page (phone and tablet), Linglass on phones and tablets and on Netflix, LingQ’s YouTube import and free vs Premium and apps. Checked 3 October 2026: Trancy pricing and downloads, Lingopie pricing and home page, Migaku pricing and downloads. Features and prices change; check each site.

Practise one line, step by step

Open an exercise from this guide. Choose a captioned video for this guide’s topic and a line whose meaning you understand.
Listen and read the caption, then say the line after the speaker in Repeat mode.
Try saying the line with the speaker in Shadow mode, following the rhythm and pauses.
Record a take, then open Compare and play your recording and the original. Review words and timing; Sada does not grade individual sounds.
Repeat the line while focusing on one difference you heard, then move to another line.

Questions people ask

Is there a Language Reactor app for phones?

There is no store app, according to its staff (March 2026). Its extension runs in Chrome on Windows and Mac, and its home page says it works on phones and tablets too. Sada runs in the phone’s browser, for speaking practice on YouTube.

Is Language Reactor free?

Its core features are free. Pro is paid: its Pro page showed €5.39 for one month to a visitor in Portugal on 3 October 2026; the price you see may differ by country.

What is the best Language Reactor alternative?

It depends on the job. For dual subtitles on more streaming sites, Trancy. For dual subtitles on YouTube in a phone app, Linglass. For a library of shows made for learners, Lingopie. For flashcards, Migaku. For studying a YouTube transcript as a reading lesson, LingQ. For practising speaking on YouTube videos, free and on a phone, Sada.

Can Language Reactor check my speaking?

Its store listing describes no check of your speech; it helps you understand videos. Sada is built for saying the lines and checking which words came across.

Can I use Language Reactor subtitles in Sada?

No. Sada uses the video’s own captions or a transcript, SRT or VTT file you paste.

Is there a Language Reactor alternative for Safari, Firefox or Android?

For speaking practice, Sada: it is a web page, not an extension, so it works in Safari on an iPhone or a Mac, in Chrome on an Android phone, and in Chrome, Edge or Firefox on a computer. It does not add subtitles to YouTube or Netflix themselves.

Start practising