Dev Tools · 1h ago
Developer Builds AI Tool for Real-Time Mandarin Tone Grading
A developer created ToneTutor, a free web app that uses Gemini 2.5 Flash to assess Mandarin speaking levels in real time. The tool grades tone accuracy, grammar, and vocabulary, then estimates HSK level and identifies weak points. It processes audio via Web Audio API and FastAPI backend, overcoming iOS Safari's lack of WebM support.
Meridian48 take
While the tool is a clever proof of concept, its limited free sessions and reliance on Gemini's speech-to-text accuracy may restrict practical use for serious learners.
Read the full reporting
"Building an HSK Speaking Test AI: Real-time Tone Grading with Gemini →
DEV Community
ai-language-learningspeech-recognition