7 Best Free Grammar Checkers in 2026 (Tested — Grammarly Isn't the Only Option)

Grammarly Premium costs $30/month. For that price, you get a grammar checker, an AI writing assistant you didn't ask for, a tone detector that's wrong half the time, and constant upsells for Grammarly Business.

Grammarly's free tier is still decent, but it only catches basic errors. The moment you need comma splice detection, word choice suggestions, or style corrections, you hit the paywall.

Good news: there are free alternatives that handle grammar just as well — and some that do specific things better. I tested 7 of them with the same 500-word text containing 23 deliberate errors (grammar, punctuation, spelling, style, and word choice).

The Test

I wrote a 500-word essay about climate policy with 23 planted errors: - 8 grammar errors (subject-verb agreement, tense shifts, pronoun issues) - 5 punctuation errors (missing commas, comma splices, semicolon misuse) - 3 spelling errors (commonly confused words: affect/effect, their/there, its/it's) - 4 style issues (passive voice, wordiness, redundancy) - 3 word choice problems (wrong preposition, informal in formal context)

I scored each tool on: errors caught out of 23, false positives (flagging correct text), and speed.

Results Overview

1. LanguageTool — Best Overall Free Grammar Checker

LanguageTool caught 19 of 23 errors, the highest of any tool tested. It nailed the grammar and punctuation categories, missed one passive voice instance and one word choice issue, and caught things the others didn't — like a subtle tense consistency error across paragraphs.

Strengths: - Open-source core, so the community contributes rules - Excellent multilingual support (30+ languages with actual grammar rules, not just spell check) - Browser extension works on any text field - The 10,000 character free limit is generous for most documents - Privacy-friendly: offers a self-hosted option

Weaknesses: - Two false positives — it flagged a stylistic inversion as an error and a correct semicolon as questionable - The premium suggestions that pop up (but can't be applied) on the free tier are annoying - No tone or readability scoring on free

Best for: Multilingual writers, privacy-conscious users, anyone who wants the highest accuracy without paying.

2. Coda One Grammar Checker — Best for Quick Checks + Extra Tools

Coda One caught 18 of 23 errors with only 1 false positive — the best accuracy-to-noise ratio in the test. It missed two style issues (one passive voice, one redundancy) and one complex punctuation case.

Strengths: - Clean, fast interface — paste text, get results in under 2 seconds - Only 1 false positive, which means you can trust the suggestions without second-guessing - The free tier (3 checks/day, no signup) is enough for daily use if you're not editing all day - Same subscription that covers grammar also gets you the AI humanizer, summarizer, PDF tools, and 50+ other tools - Runs entirely in-browser for the grammar analysis, so your text stays on your device

Weaknesses: - 3 free checks per day is limiting for heavy editing sessions - No browser extension yet — you have to go to the site - Doesn't catch as many style issues as LanguageTool or ProWritingAid

Best for: People who need occasional grammar checks and also use other writing or productivity tools.

3. Grammarly Free — The Default Choice (But Increasingly Limited)

Grammarly Free caught 16 of 23 errors. It handled spelling and basic grammar well but missed most style and word choice issues — those are locked behind Premium.

Strengths: - Browser extension is everywhere: Gmail, Google Docs, social media, text fields - Inline suggestions are smooth and non-intrusive - Spelling correction is near-perfect - The largest user base means it's been trained on the most data

Weaknesses: - Style, tone, and advanced grammar are paywalled. You see the suggestions grayed out, taunting you - $30/month is expensive for a grammar tool, especially one that's been piling on AI features - The "AI assistant" keeps popping up when you just want grammar checks - Sends your text to their servers — not great for confidential content - Missed all 4 style issues and 2 of 3 word choice problems on the free tier

Best for: People who want always-on basic grammar checking across every app and website.

4. ProWritingAid Free — Best Style Analysis (If You Can Live with 500 Words)

ProWritingAid caught 17 errors — but more importantly, it was the only free tool that identified all 4 style issues (passive voice, wordiness, redundancy). It's built for writers who care about how their text reads, not just whether it's grammatically correct.

Strengths: - Outstanding style analysis: readability score, sentence variety, sticky sentences, vague language - 20+ writing reports on the paid tier (some available free) - Integrates with Scrivener, which matters for book authors - Caught errors others missed, especially in sentence structure

Weaknesses: - The 500-word limit on free is brutal. That's less than one page. You'll hit it halfway through any real document. - 3 false positives — the most of any tool except Hemingway. It's trigger-happy on style suggestions - Slow. Noticeably slower than every other tool on this list - The interface feels cluttered compared to LanguageTool or Coda One

Best for: Fiction writers and long-form content creators willing to work within the 500-word free limit (or upgrade for $10/month).

5. Microsoft Editor — Best if You're Already in the Microsoft Ecosystem

Microsoft Editor caught 15 errors with zero false positives. Zero. Every suggestion it made was correct. It's conservative — it won't flag something unless it's confident — which means fewer errors caught but complete reliability.

Strengths: - Zero false positives in testing - Built into Edge browser and Microsoft Word (no installation needed) - Free with any Microsoft account - Clean integration that doesn't feel like a third-party add-on

Weaknesses: - Only caught 15/23 — it skipped most style issues and two punctuation errors - Basically Edge/Word only. The Chrome extension exists but is less reliable - Advanced suggestions require Microsoft 365 subscription - Doesn't support as many languages as LanguageTool

Best for: People already in the Microsoft ecosystem who want zero-noise grammar checking.

6. Ginger — Functional but Dated

Ginger caught 14 errors. It was a major Grammarly alternative five years ago, but the tool hasn't kept pace. The interface feels like it was designed in 2019 and never updated.

Strengths: - Sentence rephrasing feature (unique among free tools) - Translation built in - Text-to-speech for proofreading by ear

Weaknesses: - 14/23 detection rate is below average - The free version limits how many corrections you can make per day (they don't specify the exact number — it just stops working) - Interface is slow and cluttered with ads - The browser extension conflicts with other writing extensions

Best for: ESL learners who benefit from the rephrasing and translation features.

7. Hemingway Editor — Not a Grammar Checker (But People Use It as One)

Hemingway caught 9 errors — the worst score by far. That's because Hemingway isn't a grammar checker. It's a readability analyzer. It highlights long sentences, passive voice, adverbs, and complex phrases. It's excellent at what it does, but it's the wrong tool for catching grammar mistakes.

Strengths: - Best readability scoring of any tool on this list - Grade-level assessment is genuinely useful - Instant results — no server processing - Completely free for the web version

Weaknesses: - Caught fewer than half the errors - 4 false positives — flagged correct complex sentences as "hard to read" - No spelling check at all - No punctuation analysis

Best for: Reducing complexity and improving readability after you've already fixed grammar with another tool. Use it second, not first.

My Recommendation

For most people: LanguageTool as your daily driver (browser extension, high accuracy, generous free tier) plus Coda One for the extra writing tools you get with it.

If you only need quick grammar checks a few times a day and you're already interested in AI writing tools, Coda One's grammar checker is the most efficient option — one tool, one subscription, 53 features.

If you write fiction or long-form content, add ProWritingAid for the style analysis that no other free tool matches.

And if you're still paying $30/month for Grammarly Premium, ask yourself: are you using any of the new AI features they keep adding? If not, you're overpaying for a grammar checker.