Duolingo Ninja

Duolingo Ninja helps people learn and review Duolingo vocabulary while browsing the web, with a browser extension for inline translations and flashcards for spaced-repetition practice.

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Overview

Duolingo Ninja is a browser-based language learning product built around Duolingo vocabulary. It uses a Chrome extension to translate text on webpages using the words you have already learned, so reading the web becomes part of your study routine.

The product also includes flashcards for vocabulary practice. According to the site updates, the current app is now called DuoNinja and is focused on flashcards and spaced repetition, while the extension still supports exporting vocabulary from Duolingo.

Features

Sync Duolingo vocabulary

Synchronize the words you have learned in Duolingo and keep them available inside the extension and flashcards workflow.

Translate browsing content

See translations inserted into webpages as you browse so you encounter your target language in context.

Spaced-repetition flashcards

Practice the vocabulary with flashcards built around spaced repetition, so missed items come back more often.

AI sample sentences

Review AI-generated sample sentences in flashcards to see words used in context.

Vocabulary export

Download your vocabulary list and reuse it with Duolingo Ninja or another flashcards tool.

Translation controls

Control what gets translated by choosing source language, adjusting translation depth, and ignoring selected domains.

Use cases

Learn while browsing
Read webpages in your target language and see vocabulary translated inline, so you can learn from normal articles, posts, and documentation without leaving the browser.
Practice words you rarely see
Review less common words with flashcards when browsing alone is not enough to keep them fresh.
Reuse vocabulary elsewhere
Export a Duolingo vocabulary list for use in another flashcards app or personal study system.
Skip specific domains
Adjust translation behavior for work-related or otherwise sensitive sites by excluding domains from translation.
Study with flashcards
Use spaced repetition and sample sentences to strengthen recall when you want more structured practice than web reading provides.

Pros and Cons

Pros

Learns vocabulary in the context of normal web browsing instead of requiring a separate study app.
Supports flashcards with spaced repetition for words you may not encounter often while browsing.
Lets you download or reuse your Duolingo vocabulary outside the product.
Includes controls for translation depth and domain exclusion, which helps tailor the workflow to different sites.

Cons

The updates page says the website translate function has been removed from the new DuoNinja app, at least for now.
The free plan translation limit was reduced from 20,000 to 3,000 characters in an update note.
The site does not publish a full current pricing table or complete billing details on the pages provided.

FAQ

How do I use Duolingo Ninja?

Duolingo Ninja installs as a browser extension. The home page says you can install it from the Chrome Web Store, and the flashcards page says it works with Google Chrome, Microsoft Edge, Brave, and Opera.

Who is Duolingo Ninja for?

The product is aimed at people who want to keep learning Duolingo vocabulary while browsing the web. It is especially useful if you want more exposure to your learned words in real reading contexts instead of only in lesson-style practice.

Is Duolingo Ninja still the current app name?

No. The pricing page says Duolingo Ninja is now DuoNinja, subscriptions have carried over, and existing users need to reset their password before logging in.

Does the app still translate webpages?

Yes, but the product has changed. The updates page says DuoNinja is now focused on flashcards and spaced repetition, and it no longer has the website translate function.

Can I export my Duolingo vocabulary?

The home page says you can download your Duolingo vocabulary and use it with Duolingo Ninja or another tool. The flashcards page also notes that some language lists exist on the site, but the safest route is to sync your words from Duolingo.

Quick Facts

Category: Language learning
Primary mode: Browser extension + flashcards
Browsers mentioned: Chrome, Edge, Brave, Opera
Current app name: DuoNinja
Source domain: duolingoninja.com
Pricing note: Free and paid plans are mentioned, but full pricing details were not published on the provided pages