GrammarBot 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

Free plan: Both — GrammarBot is free to use, ProWritingAid has a free plan
Higher Trust score: ProWritingAid — 96 vs 69 for GrammarBot
Best fit: GrammarBot: iPhone users wanting free grammar and tone help outside the browser · ProWritingAid: Fiction authors editing a full manuscript before querying or self-publishing
Platforms: GrammarBot: iOS · ProWritingAid: Web, Chrome extension, Windows, macOS
Status: Both up at our last check — GrammarBot Sep 1, 2026, ProWritingAid Sep 6, 2026

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

GrammarBotFree iOS app for grammar checks, message rewrites, tone changes, and translation across several languages.

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

Side by side

Fact	GrammarBot	ProWritingAid
Category	Grammar & Proofreading	Grammar & Proofreading
Pricing model	Free	Freemium
Starts at	—	$10/mo
Trust score	69 / 100	96 / 100
Platforms	iOS	Web, Chrome extension, Windows, macOS
Company	Yevhenii Filatov	Orpheus Technology Ltd
Launched	—	2013
Last verified	Sep 1, 2026	Sep 6, 2026

What our research says

GrammarBot

A free, narrowly scoped iOS grammar and rewrite app rather than a browser tool, useful mainly for someone who wants grammar help built into their phone keyboard workflow. Being a free solo-developer app rather than a funded product is worth weighing against needing consistent long-term support.

Pros

Free to download with no visible in-app purchase pricing
Covers rewriting and tone shifting, not just spelling and grammar
Supports translation across six other languages in the same app

Cons

iOS only, no Android, web, or desktop version
Built and maintained by a solo developer rather than a company, per the App Store listing
Easy to confuse with the unrelated GrammarBot.io API product of the same name

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 GrammarBot if you need

iPhone users wanting free grammar and tone help outside the browser
Multilingual users needing translation alongside grammar checks

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