Hi Product Hunt 👋 I'm Ryota, the indie maker behind Suikou AI. I built Suikou AI after seeing how often an AI draft could be grammatically correct yet still feel unnatural—especially in Japanese. Small choices in verb endings, particles, and the balance of kanji and kana can make the difference between writing that flows and writing that feels translated. Suikou AI gives you three editing modes—casual, academic, and business—so you can revise a draft for its actual audience. It is designed to keep citations and important terms intact, but the result always remains something you should read, verify, and own. This is an editing aid, not a promise to bypass detectors or a substitute for following a school, publication, or workplace policy. My goal is simply to make revision faster while keeping the writer responsible for the final words. I'd especially value feedback from people who write in Japanese or move between languages: where does an AI-assisted draft still sound least natural to you? — Ryota

Suikou AI

Make AI writing sound natural — strongest in Japanese

Make AI writing sound natural — strongest in Japanese