Grammarly vs ParagraphAI

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: Grammarly — $12/mo vs $24.99/mo for ParagraphAI
Free plan: Both have one
Higher Trust score: Grammarly — 94 vs 87 for ParagraphAI
Best fit: Grammarly: Anyone writing in a browser, Word or email who wants corrections in place · ParagraphAI: Heavy mobile emailers and messagers
Platforms: Grammarly: Web, Chrome extension, Windows, macOS, iOS, Android · ParagraphAI: Web, iOS, Android, Chrome extension

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

ParagraphAIKeyboard-level writing help for phones, browser and email replies

Side by side

Fact	Grammarly	ParagraphAI
Category	Grammar & Proofreading	AI Writing Assistants
Pricing model	Freemium	Freemium
Starts at	$12/mo	$24.99/mo
Trust score	94 / 100	87 / 100
Platforms	Web, Chrome extension, Windows, macOS, iOS, Android	Web, iOS, Android, Chrome extension
Company	Superhuman	ParagraphAI Inc.
Launched	2009	2022
Last verified	Oct 16, 2026	Oct 16, 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

ParagraphAI

The keyboard is the whole argument: if you write serious volume from a phone it beats copy-pasting into a chatbot. On desktop it is hard to justify $24.99 a month against Grammarly or a general LLM subscription that does more.

Pros

Native iOS and Android keyboard works inside any app, not just a web editor
40+ languages with per-user fluency settings
Free tier is workable for light use at five uses per action per day
Annual billing halves the effective rate to $12.49 a month

Cons

$24.99 on monthly billing sits above Grammarly's consumer tier for a narrower feature set
10,000-character input cap even on Pro, which rules out long documents
No developer API, and team controls only exist on the custom Enterprise plan
Marketing leans on unverifiable Fortune 500 adoption claims

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 ParagraphAI if you need

Heavy mobile emailers and messagers
Non-native English speakers wanting tone and formality control while typing
Sales and support reps replying from a phone between meetings