About Grammar Checker AI

Grammar Checker AI returns your whole text corrected and lists the main fixes with a reason for each, in English, so you can review every change and learn the rule behind it. It has settings for six languages and two depths: proofread for errors only, and polish for errors and clarity.

Checks are run by Claude Haiku 5.5, a language model made by Anthropic, through a commercial model API, guided by our own proofreading rules: what to correct, what to keep exactly as written, a checklist for each language, and the plain-text shape of the answer. The rules treat instructions inside your text as text to correct, not as requests to follow.

We publish no accuracy rate. Like any grammar checker, ours can miss an error or change something that was correct, especially names, technical terms, dialect and deliberate style. Review each fix before you use the result, and follow the rules of your school, publisher or employer about writing tools.

Every word you check costs 1 credit, with a 20-credit minimum per check: $0.08 to $0.20 per 1,000 words. Signing up is free and includes no credits. Packs start at $4.99 and plans at $7.99 a month, and failed checks are refunded automatically.

Texts and results are stored to show your history, and each text is sent to the model provider only to run your check. We do not sell your text or use it to train models. You can ask us to delete your account and its history.

For questions about your account, billing, refunds or data, write to us from the email address on your Grammar Checker AI account.