Skip to content
effecthub

Grammarly vs RewriteCmd

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, RewriteCmd at $5. Both have a free tier.

GrammarlyGrammar, tone and rewriting help inside every appRewriteCmdHighlight text in any Mac app, hit a hotkey, and get it rewritten in place by Claude, GPT, or Mistral.

Side by side

FactGrammarlyRewriteCmd
CategoryGrammar & ProofreadingParaphrasing & Rewriting
Pricing modelFreemiumFreemium
Starts at$12 month$5 month
Public APINoNo
PlatformsWeb, Chrome Ext, Windows, macOS, iOS, AndroidmacOS
CompanySuperhumanHyperstack Studio
Launched2009—
Last verifiedSep 6, 2026Sep 1, 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

RewriteCmd

RewriteCmd's whole value is staying out of the way — no browser tab, no copy-paste round trip, just select text and hit a hotkey. Storing API keys locally in the Keychain instead of routing them through a vendor server is a real, checkable privacy choice, but it also means you need your own API key and are paying the model provider separately from the $5 app fee.

Pros

  • Works inside any Mac app via a global hotkey rather than a single integration
  • Supports three model providers (Claude, GPT, Mistral) instead of locking you into one
  • API keys stay local in the Keychain rather than passing through the vendor's own servers

Cons

  • Requires bringing and paying for your own API key on top of the app's $5/month fee
  • macOS 13+ only — no Windows, Linux, or mobile version exists

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 RewriteCmd if you need

  • Mac users who rewrite text across many different apps and want one shortcut everywhere
  • Anyone who already has a Claude, OpenAI, or Mistral API key and wants a lightweight front end for it

More comparisons

Browse all Grammar & Proofreading →