Learn Japanese contextually while browsing
Hi 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…
Learn Japanese contextually while browsing launched on December 17, 2025 with 92 votes, #333 of 11,628 launches that month and more than 95% of that year's launches.
In plain words
Lingoku is a browser extension that helps Japanese learners acquire vocabulary passively while browsing the web. It replaces selected English words with Japanese vocabulary matched to the user's proficiency level, allowing them to understand context while naturally picking up new words. An AI backend ensures translations fit contextually, distinguishing between different word meanings. The tool is designed for language learners who spend significant time online and want to incorporate study into their daily browsing habits. A free plan with daily credits is available alongside paid options.
written from the facts on this page · September 2026
From the sources
Most apps trap you in "student mode"—memorizing lists & drills. Lingoku.AI lets you acquire languages naturally by consuming real-world content (News, YouTube & Netflix). No lessons, just immersion. Absorb vocabulary and nuance directly from what you watch and read.
Watch anime & J-dramas and Lingoku adds furigana, explains kanji in context, distinguishes keigo politeness levels. Learn real Japanese, not textbook Japanese.
No kanji drills. No grammar workbooks. No habit changes. Install Lingoku and every anime episode, every J-drama, every Japanese article builds real skills that last. AI adds furigana readings, explains kanji in context, and distinguishes keigo politeness levels — so you learn real Japanese, not textbook Japanese. Meaning, usage, and tone are interpreted from the full line. Lingoku runs as a browser extension — no app switching, works instantly on every platform you use. See an unfamiliar kanji? Don't pause, don't screenshot, don't open Jisho. Hover over it — 0.2 seconds later, AI gives you the reading (furigana), meaning, and exactly what it means *in this line of dialogue*. Whether it's 手紙…from lingoku.ai
In the maker’s words, at launch
Hi 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…
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