Nativra vs Language Reactor

Language Reactor overlays dual subtitles on Netflix and YouTube in your browser; Nativra is a separate study app with saved cards and spaced repetition.

Written by Ali HosseiniUpdated September 14, 2026(published September 2, 2026)

In shortLanguage Reactor is a Chrome extension that adds dual-language subtitles, hover dictionaries, and phrase saving to Netflix and YouTube, and it is excellent at exactly that. Nativra is a standalone web app that takes a YouTube link or subtitle file and builds a study session around it: synchronized read-along, CEFR-tagged lookups, sentence cards with timestamps, built-in SM-2 review, and Anki export. Use Language Reactor if you want to watch Netflix with better subtitles; use Nativra if you want to turn videos into a review system.

Feature by feature

Feature	RYUN	Language Reactor
Netflix support	No	Yes (its main strength)
Dual subtitles while watching	Target-language read-along with click lookups	Machine-translated second subtitle track shown simultaneously
Spaced repetition	Built-in SM-2 scheduler	Saved items list; export for review elsewhere
Anki export	TSV with sentence, meaning, CEFR, timestamp	Export available with limited fields
Custom subtitle files	Upload any SRT/VTT	Limited; primarily works with the site's own subtitles
Browser and device	Any modern browser, including mobile	Chrome-family desktop browsers
Install	None	Extension
Maturity	Open beta, one developer	Established, very large user base

Netflix support

RYUN

Language Reactor

Yes (its main strength)

Dual subtitles while watching

RYUN

Target-language read-along with click lookups

Language Reactor

Machine-translated second subtitle track shown simultaneously

Spaced repetition

RYUN

Built-in SM-2 scheduler

Language Reactor

Saved items list; export for review elsewhere

Anki export

RYUN

TSV with sentence, meaning, CEFR, timestamp

Language Reactor

Export available with limited fields

Custom subtitle files

RYUN

Upload any SRT/VTT

Language Reactor

Limited; primarily works with the site's own subtitles

Browser and device

RYUN

Any modern browser, including mobile

Language Reactor

Chrome-family desktop browsers

Install

RYUN

None

Language Reactor

Extension

Maturity

RYUN

Open beta, one developer

Language Reactor

Established, very large user base

When to choose the alternative

You watch mostly Netflix and want better subtitles in place.
You want to see a translation line at the same time as the original.
You want a mature product with a large community.

When to choose RYUN

You want saved words to become scheduled reviews, not a list.
You want to study subtitle files from any source.
You use a phone or a non-Chrome browser.

Overlay versus study session

Language Reactor lives inside the video player. It makes watching easier (two subtitle tracks, hover definitions, playback that pauses at line ends) and it does that very well on the sites it supports. It is the tool to use when the goal is to watch more comfortably.

Nativra is the tool to use when the goal is to retain what you watched. Words you click become cards with the sentence and the moment in the video; those cards are scheduled by SM-2 or exported to Anki. The read-along view is deliberately target-language only, with lookups on demand, because simultaneous translation lines tend to pull attention away from the audio.

Frequently asked questions

Can I use both?

Yes, and many learners do: Language Reactor for comfortable Netflix watching, Nativra for YouTube study sessions and review.

Does Nativra show a translated subtitle line?

Not as a permanent second track. Click a word or line for its meaning; the design keeps your eyes on the target language.

/solutions/convert-youtube-subtitles-to-anki /vs/migaku-alternative /solutions/practice-listening-comprehension-video

Build a review deck from a video