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…
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
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 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 translations fit the context (so it distinguishes between different meanings of the same word). since it uses paid AI APIs for the words replacement, I couldn't make it 100% free (server costs are real, unfortunately). However, there is a "forever free" plan with daily credits that doesn't require a credit card. it should be enough for casual daily browsing. I built this because I struggle with Anki burnout and wanted a way to review words without feeling like i am "studying" It supports Chrome, Edge, and Firefox now. would love any feedback or feature requests! https://lingoku.ai/learn-japanese
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