Grammarix

At a glance

• Editor score
  6.5 / 10
• Pricing
  Free plan
• Best for
  Free checks for sentence structure and grammar rules
• Free plan
  Yes
• Paid from
  Free
• Facts checked
  24 Sep 2026

• Where it wins

  • Checks grammar, spelling, punctuation and word choice
  • Flags run-ons, passive voice and overused words
  • Covers more than 400 grammatical rules

• Where it doesn't

  • Web-only access requires an internet connection
  • No browser extension or downloadable app
  • Automated checks offer a narrower workflow than human proofreading

Our verdict on Grammarix

Grammarix is a browser-based proofreading tool for students, professionals and other writers who want quick checks of English text. Writers paste text into the site and receive feedback on grammar, spelling, punctuation, word usage, sentence structure and flow. The free checker also highlights possible plagiarism, run-on sentences, passive voice and overused words, with explanations for highlighted issues. It is designed for individual writing tasks rather than a broader editing workflow, and submissions are described as handling approximately 1,800 words at a time.

The checker’s range is its main distinction: Grammarix says it checks against more than 400 grammatical rules, and it can suggest active-voice alternatives and replacements for overused words. Checks are described as running in real time, with no download required. This can suit someone who wants immediate feedback on a draft in a browser, especially when sentence construction and rule-based grammar are the main concerns. Plagiarism flagging is also included, using the service’s internal checking software; it should be treated as a flag for review rather than a substitute for a dedicated originality workflow.

Grammarix is free, with a Free plan covering the listed checking features. Its web-only delivery means there is no browser extension or offline mode, so it is less suited to writers who want editing support embedded in other tools or available without an internet connection. Support is listed through email and documentation. The product is a reasonable fit for solo writers and small-scale needs that call for a quick browser check, but those seeking deeper workflow integrations or human editing should consider alternatives; Grammarix’s homepage links separately to an external paid human proofreading service.

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Grammarix pricing

All 1 Grammarix plans and prices →

Grammarix fact sheet

Alternatives to Grammarix

• GrammarlyA broad writing assistant with free checks and paid rewrites, detection, and team controls.9.4
• LanguageToolA flexible proofreading assistant for multilingual writing, with free and Premium plans.9.2
• DeepL WriteA flexible proofreading assistant for style and phrasing across devices.9.0

See all Grammarix alternatives →

Featured on iTechGuides

Grammarix is listed in our Proofreading Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update