Our take: Flags grammar and spelling mistakes instantly with no account. It caught 3 of the 4 errors we planted and wrongly flagged one brand name. Your text is sent to LanguageTool’s servers.
- ✓ Checks without sign-up — tested
- ✓ Caught 3 of 4 errors — tested
- Auto language detection
- ! Text sent to server
- ? China access — not tested yet
Our test
Tested 28 Sep 2026 · Chrome desktop · English sentence with 4 planted errors “This are a test sentence with a eror. SiteCurio check it for free.”
How we checked privacy: Typing sent check requests to api.languagetool.org, so your text is processed on its servers. Check the privacy policy before pasting work documents.
Data sheet
Every row shows how we know it
| Free limit | Checks in the web editor without an account Tested |
|---|---|
| Sign-up | Not required Tested |
| Caught | Subject-verb agreement, a/an, spelling Tested |
| Missed | “SiteCurio check” (verb agreement) Tested |
| Input handling | Sent to api.languagetool.org Tested |
| Extras | Picky Mode, style suggestions (some paid) Official |
| Access from China | — Not tested |
When to use it
A quick grammar and spelling pass before sending an English email or report.
Before you use it
It doesn’t catch everything (3 of 4 in our test) and may flag brand names — don’t accept suggestions blindly. Text is sent to its servers.
How to use it
- Open languagetool.org (no sign-up).
- Paste your text — the language is detected automatically.
- Click underlined parts to review and apply suggestions.
Alternatives
Last verified 28 Sep 2026 · Found something outdated? Tell us. · Official site