Enno is a web-based Japanese error checker from BPS Inc. It scans text for obvious mistakes like typos, spacing errors, conversion mishaps, and character corruption using a database of known error patterns rather than AI. The tool prioritizes precision over recall, flagging only clear errors to minimize false positives.

Text entered into Enno is not stored on servers or logged, keeping documents private. The service handles formal documents, science and engineering texts with specialized punctuation, and AI-generated content. Enno works well alongside other proofreading tools, catching straightforward mistakes that pattern matching handles reliably.

Enno is completely free with no registration required and no paid tiers or premium features.