Grammarly

Grammarly’s defining feature isn’t any single capability but its reach — it runs as a browser extension, desktop app, mobile keyboard and direct integration inside Google Docs and Microsoft Word, which means it catches errors wherever you’re actually typing rather than requiring you to paste text into a separate tool. That ambient presence is what makes it stick as a daily habit rather than an occasional check.

It suits almost anyone who writes regularly and wants fewer typos and clearer sentences without becoming a grammar expert themselves — students, professionals drafting emails, non-native English writers, and teams that want a consistent baseline of polish across everyone’s writing. The tone detection feature adds something a plain spell-checker doesn’t: a read on whether a message might land as too blunt or too casual before it’s sent.

The free tier genuinely covers the basics well, which is unusual in this category — most competitors gate core functionality behind a paywall. Paid tiers unlock generative rewriting and more nuanced tone and clarity suggestions, and Business/Enterprise plans add the governance and admin controls larger teams need, at a real price jump from the individual plan.

The recurring complaint is over-flagging: Grammarly can treat a deliberate stylistic choice — a sentence fragment for effect, informal phrasing on purpose — as an error to fix, and it takes a moment of judgment each time to decide whether to accept, ignore or override a suggestion.