PromptTutor: AI English coach with vocabulary-aware translation

Practice English by asking AI questions, with auto glosses and bilingual lines based on your vocabulary

Problem

A user insists on asking AI questions purely in English to learn, but writing standard sentences every time is exhausting, long English replies are harder to read than Chinese, and they often manually look up words. Existing language learning tools either detach from real AI conversations or fail to adapt to the user's vocabulary level.

Solution

A browser extension or chat frontend that intercepts English messages sent to AI, first corrects grammar and expression, then automatically adds Chinese glosses to unfamiliar words in AI replies based on the user's set vocabulary level (e.g., CET-4/6, IELTS). It supports one-click toggle between English-only and bilingual lines.

Users

Developers, students, and professionals who want to improve English through real AI conversations

MVP

Browser extension or standalone web input box; call LLM for grammar correction and vocabulary-level tagging; show hover translations for words beyond the user's vocabulary list; support saving a word book.

Revenue

Free tier with limited daily corrections; subscription for unlimited corrections, custom vocabulary lists, and word review; or pay-per-use API.

Why now

AI chat has become a daily learning tool, but the layer for language learners is still thin. Indie developers can quickly integrate existing LLM APIs to build niche tools.