Checked here.Never sent.
Wordwarden underlines spelling and grammar mistakes as you type, in any text box, and fixes them in one click. It all runs on your
Spellingcompter → computerNothing changes until you pick a fix. This is the card you get on any website..
Free, with no account.
Every check runs in your browser, offline. No servers, no tracking.
Accuracy, release by release
Brackets show the change from the release before. Held-out test data, never used for tuning.
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Every release, postmarked
Each bigger release and the newest. Pick a stamp to read what changed; a dot means its accuracy was measured.
The newest release next to LanguageTool's latest version at the time of that release, in its default setup, on five spelling sets and a set of learner essays. Hover a bar for the details.
Spelling
Grammar learner essays
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All your tabs share one checker, it uses no CPU while you are not typing, and there is nothing to install besides the extension. Measured against your own LanguageTool server, checking the same text on the same machine.
Resource use
GitHub’s Linux machine, 2 cores. Memory is private memory. Each row has its own scale; LanguageTool is the full bar, and its own browser extension is not counted.
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Install it
Free for good: no account, no premium tier. Every version has US, UK, Canadian or Australian English, your own dictionary, and per-site on and off.
Chrome, Edge, Brave
On its way to the Chrome Web Store. Until then, download the chrome zip, unzip it, open chrome://extensions, turn on Developer mode and choose Load unpacked. This copy does not update itself.
LibreOffice
The same spelling and grammar engine for Writer. Download the file for Windows, macOS or Linux and double-click it, then restart LibreOffice.
Download from GitHub