Duolingo Ninja
Learn your Duolingo vocabulary while browsing the web
Duolingo Ninja launched on June 28, 2023 with 82 votes, #896 of 4,655 launches that month and more than 50% of that year's launches. The site was still online in September 2026, 3 years on.
What it does
Use the Chrome extension to translate text on web pages based on your Duolingo vocabulary. Sync your vocabulary from Duolingo and choose between word and sentence translation. That's how easy it is.
Take existing courses or create your own, with customizable learning, flashcards, and spaced repetition.
Learn through content you actually love—news, books, and stories. Authentic headlines and reporting — the kind of language you'll actually encounter online. Hover a word to peek its meaning. Las nuevas exigencias afectarán a sistemas usados en sanidad, infraestructuras críticas y herramientas que puedan influir en decisiones judiciales o laborales. Use spaced repetition system (SRS) to help you remember better. Helpful when you need it, but not the whole experience. Start with an existing course, or create one around your interests and goals. Use the language variant you care about (e.g. Brazilian Portuguese, Mexican Spanish). Choose from many high-quality voices per language for example…from duoninja.com
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Learn Languages with Google Translate2019 · chromewebstore.google.com · ▲93Learn the words you translate with one click
Learn Japanese contextually while browsingDec 2025 · lingoku.ai · ▲92Hi HN, Just wanted to share a tool i've been working on to help with my own study routine. It’s a browser extension called Lingoku. The idea is simple: we spend hours browsing the web in English every day. This tool replaces some of the english words with Japanese vocabulary based on your japanese level (Similar to Toucan, but with a better user experience). It’s basically an attempt to make the "i+1" method actually passive, you understand the sentence because it's mostly english, but you pick up Japanese words naturally from the context. It uses an LLM in the backend to make sure the…
Personalized Duolingo (kind of) for vocabulary building2025 · github.com · ▲161Hi! Wanted to share the project I really wanted to have. TLDR; this app lets you create your own list of words and you get a Duolingo-like experience (kind of, still needs a lot of features) practicing those words in their context. My English is not the best but not the worst either. But I realized I can't boost it up after a certain level! In my belief, in order to truly learn a language, you need to be exposed to that language often. Vocabulary is the key factor here if you really want to improve in any language. My experience is that when I read a book to improve my English vocabulary, I…
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