BonPatron vs Grammarly

This is the defining split. Grammarly shows you the correction and moves on — great for fluent writers who just want clean output. BonPatron explains the grammatical rule behind each error, which is exactly what a language learner needs. Getting a red underline fixed for you is useless if you make the same mistake on the next sentence.

Grammarly lives in your browser, your Google Docs, your email client, your Word document. It's ambient. BonPatron is a standalone web tool you paste text into. For a learner doing focused practice, that's fine. For anyone writing professionally across multiple apps all day, BonPatron's workflow is a dealbreaker.

BonPatron is built for French — that's its entire identity and the source of its depth. It has nearly 20 years of refinement specifically for French grammar edge cases. Grammarly is built for English, full stop. If you're writing in French, Grammarly's support is surface-level at best. If you're writing in English, BonPatron is irrelevant.

Grammarly's free tier is genuinely good, but the product is engineered to make you feel its limits constantly — advanced suggestions, tone detection, and plagiarism checks are all locked behind a premium plan that's expensive relative to alternatives. BonPatron is simply free, no upsell, no account required. For a student or learner on a budget, that's a real advantage.