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Grammarcheck.ai vs Grammarly

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors. Grammarcheck.ai starts at $2.50, Grammarly at $12. Both have a free tier.

Grammarcheck.aiGrammar, spelling, and punctuation checker with one-click fixes plus a plagiarism checker and humanizer.GrammarlyGrammar, tone and rewriting help inside every app

Side by side

FactGrammarcheck.aiGrammarly
CategoryGrammar & ProofreadingGrammar & Proofreading
Pricing modelFreemiumFreemium
Starts at$2.50 month$12 month
Public APINoNo
PlatformsWebWeb, Chrome Ext, Windows, macOS, iOS, Android
CompanyGrammarcheck.aiSuperhuman
Launched—2009
Last verifiedSep 1, 2026Sep 6, 2026

What our research says

Grammarcheck.ai

Grammarcheck.ai covers the basics, grammar, spelling, punctuation, plus a paraphraser, plagiarism checker, and humanizer bundled into the same credit pool. Pricing is clearly published and cheap relative to the bigger names in this space, though the credit system means heavier tools like the humanizer burn through an allowance much faster than plain grammar checking.

Pros

  • Clear, published pricing with both monthly and yearly options
  • Free tier includes a real usage allowance, not just a trial window
  • Bundles a paraphraser, plagiarism checker, and humanizer alongside grammar checking
  • Accepts common payment methods including PayPal and Apple Pay

Cons

  • Credit costs vary a lot by tool, so the humanizer and plagiarism checker drain an allowance far faster than grammar checking
  • No company name or location disclosed beyond the product's own brand

Grammarly

Still the default for catching mistakes inside other people's software, but the free tier has quietly become an AI-prompt meter and the honest price is $30 unless you commit to a full year.

Pros

  • Runs inside the apps people already write in rather than as a separate editor
  • Free tier still covers spelling, grammar and tone detection with no time limit
  • Pro folds in plagiarism and AI-text detection that rivals charge for separately

Cons

  • The $12 headline is the annual rate; paying monthly costs $30
  • Free AI allowance is 100 prompts a month and depletes quickly
  • No public API, so it cannot be embedded in another product
  • Enterprise pricing is not published anywhere on the site

Which one fits

Choose Grammarcheck.ai if you need

  • Students and bloggers wanting a low-cost checker with extras bundled in
  • Non-native English speakers who want one-click fixes rather than just flags

Choose Grammarly if you need

  • Anyone writing in a browser, Word or email who wants corrections in place
  • Teams enforcing a house style guide across people who are not writers
  • Non-native English speakers who want fluency rewrites, not just error flags

More comparisons

Browse all Grammar & Proofreading →