Grammarcheck.ai vs ProWritingAid

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 $10/mo for ProWritingAid
Free plan: Both have one
Higher Trust score: ProWritingAid — 96 vs 84 for Grammarcheck.ai
Best fit: Grammarcheck.ai: Students and bloggers wanting a low-cost checker with extras bundled in · ProWritingAid: Fiction authors editing a full manuscript before querying or self-publishing
Platforms: Grammarcheck.ai: Web · ProWritingAid: Web, Chrome extension, Windows, macOS

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.

ProWritingAidManuscript editor for fiction authors with grammar, style and pacing reports, AI rephrasing and chapter critiques

Side by side

Fact	Grammarcheck.ai	ProWritingAid
Category	Grammar & Proofreading	Grammar & Proofreading
Pricing model	Freemium	Freemium
Starts at	$2.50/mo	$10/mo
Trust score	84 / 100	96 / 100
Platforms	Web	Web, Chrome extension, Windows, macOS
Company	Grammarcheck.ai	Orpheus Technology Ltd
Launched	—	2013
Last verified	Oct 15, 2026	Sep 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

ProWritingAid

For novelists, ProWritingAid is the editor that looks at pacing, repetition, dialogue tags and chapter structure rather than just commas, and the yearly price is a third of the monthly one. The reports take time to learn and the newer AI critique features are rationed by daily caps even on paid plans. If you write emails and reports rather than manuscripts, you are paying for depth you will not use.

Pros

Reports on style, readability, repetition, pacing and dialogue, not just grammar
Chapter and manuscript critiques, character analysis and a virtual beta reader on paid plans
Integrations across Word, Google Docs, Scrivener, browsers, Notion, Pages and a desktop editor
Yearly Premium at $10 a month, plus a lifetime option at $399

Cons

Monthly billing is three times the yearly rate ($30 versus $10)
AI critique and Sparks are capped per day even on Premium (1 chapter critique, 5 Sparks)
Free tier checks only 500 words at a time
Report density is overwhelming at first and takes time to learn

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 ProWritingAid if you need

Fiction authors editing a full manuscript before querying or self-publishing
Writers who want structural feedback (pacing, chapter critique, beta-reader style notes) alongside grammar
Scrivener, Word and Google Docs users who want checks inside their existing tool