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.

The short answer

Cheaper paid plan: Grammarcheck.ai — $2.50/mo vs $12/mo for Grammarly
Free plan: Both have one
Public API: Grammarcheck.ai has one; not confirmed by us for Grammarly
Higher Trust score: Grammarly — 94 vs 84 for Grammarcheck.ai
Best fit: Grammarcheck.ai: Students and bloggers wanting a low-cost checker with extras bundled in · Grammarly: Anyone writing in a browser, Word or email who wants corrections in place

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

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

Fact	Grammarcheck.ai	Grammarly
Category	Grammar & Proofreading	Grammar & Proofreading
Pricing model	Freemium	Freemium
Starts at	$2.50/mo	$12/mo
Public API	Yes	Not confirmed
Trust score	84 / 100	94 / 100
Platforms	Web, API	Web, Chrome extension, Windows, macOS, iOS, Android
Company	Grammarcheck.ai	Superhuman
Launched	—	2009
Last verified	Oct 15, 2026	Oct 16, 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