Hey WondTech readers! We just heard about a neat new web app that could really help Japanese language learners. It's designed to measure your Japanese read-aloud speed and fluency, giving you instant, personalized feedback. What this means for you is a practical, immediate way to practice and improve your spoken Japanese without needing a human coach for every session. This innovative app works in a simple way. You read a short Japanese passage aloud into your microphone — typically the opening lines of classics like 'The Tale of the Heike' or 'Hōjōki' — for up to ten seconds. After you're done, the app measures your performance. It uses the AmiVoice API, a powerful speech recognition tool, to accurately pinpoint your pure speaking speed in characters per minute and even detect any pauses or hesitations, known as your stagnation rate. But it doesn't stop there. This is where the AI coaching comes in. The app leverages Claude Haiku, an AI, to give you a concise piece of feedback. You'll receive one compliment about your reading and one specific area for improvement. This «two-stage» design is clever: the code handles the raw calculations, and the AI focuses solely on crafting helpful, encouraging words. The developer behind this project is an ex-Java engineer currently diving into TypeScript and Python. This app was a personal milestone, marking their first deep dive into «AI-collaborative development». They've shared insights into how they designed the evaluation logic using AmiVoice's per-word timestamps and how they built a Backend for Frontend (BFF) to keep API keys secure. It's a great example of how modern development is incorporating AI not just for features, but as a genuine partner in the creation process. For anyone learning Japanese, or even developers interested in AI-powered language tools, this app offers a promising look into the future of self-improvement.