Sloth Coach uses an in-browser Gemma model to explain exam mistakes for Japan's construction visa test

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A developer who runs a study site for foreign workers preparing for Japan's Specified Skilled Worker construction exam built Sloth Coach, a tool that explains missed questions. When a user answers incorrectly, a small Gemma model running locally in the browser gives a short explanation in the learner's language, including Chinese, English, Vietnamese, Indonesian, or simplified Japanese. At the end of each session, the tool produces a review list for the next day based on past mistakes. The project runs entirely client-side with WebLLM and WebGPU, requiring no server, API key, or account, and stores results in local browser storage. It was submitted to the DEV Hacktoberfest Open-Source AI Challenge.

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