best ai tools: grammar checker
Four grammar checkers, ranked by whether they fix writing or just underline it.
quick answer
Our top pick for grammar checker is Grammarly (freemium). This page compares 4 options side by side, 4 of them with a free plan, checked by hand in november 2026.
last checked november 2026, pricing can change, confirm on the official site before you pay
how we pick
Every app on this page was tried on the same real grammar checker task, with the same input, so the ranking is a fair comparison.
result quality
Does the output actually finish the job, or does it just look busy? Quality decides the ranking.
speed and effort
How long from opening the app to a result you can use, and how much fixing it needs after.
the free print
What the free plan really gives you: limits, quality caps, and watermarks, in plain words.
questions people ask
What is the best free grammar checker?
Grammarly's free plan covers everyday mistakes almost everywhere you type. LanguageTool is the best free option for multiple languages and privacy-conscious users.
How do we rank the tools on this page?
We try each tool on the same real task, check what the free plan actually gives you, and rank by results for a typical US user, not by who pays us. Nobody can pay to move up this list.
sources
Pricing and plan details on this page were checked against the official site of each app in november 2026: