Grammarly 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: ProWritingAid — $10/mo vs $12/mo for Grammarly
Free plan: Both have one
Higher Trust score: ProWritingAid — 96 vs 91 for Grammarly
Best fit: Grammarly: Anyone writing in a browser, Word or email who wants corrections in place · ProWritingAid: Fiction authors editing a full manuscript before querying or self-publishing
Platforms: Grammarly: Web, Chrome extension, Windows, macOS, iOS, Android · 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

GrammarlyGrammar, tone and rewriting help inside every app

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

Side by side

Fact	Grammarly	ProWritingAid
Category	Grammar & Proofreading	Grammar & Proofreading
Pricing model	Freemium	Freemium
Starts at	$12/mo	$10/mo
Trust score	91 / 100	96 / 100
Platforms	Web, Chrome extension, Windows, macOS, iOS, Android	Web, Chrome extension, Windows, macOS
Company	Superhuman	Orpheus Technology Ltd
Launched	2009	2013
Last verified	Sep 6, 2026	Sep 6, 2026

What our research says

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

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 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

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