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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. Grammarly starts at $12, ParagraphAI at $24.99. Both have a free tier.

GrammarlyGrammar, tone and rewriting help inside every appParagraphAIKeyboard-level writing help for phones, browser and email replies

Side by side

FactGrammarlyParagraphAI
CategoryGrammar & ProofreadingAI Writing Assistants
Pricing modelFreemiumFreemium
Starts at$12 month$24.99 month
Public APINoNo
PlatformsWeb, Chrome Ext, Windows, macOS, iOS, AndroidWeb, iOS, Android, Chrome Ext
CompanySuperhumanParagraphAI Inc.
Launched20092022
Last verifiedSep 6, 2026Sep 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

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
  • Anyone who needs inline translation mid-conversation

More comparisons

All ParagraphAI alternatives →Browse all Grammar & Proofreading →