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Grammarly vs Textglow

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, Textglow at $4.99. Both have a free tier.

GrammarlyGrammar, tone and rewriting help inside every appTextglowBrowser tool that rewrites a draft into one of ten tones in about a second, inside Gmail, Slack, or LinkedIn.

Side by side

FactGrammarlyTextglow
CategoryGrammar & ProofreadingParaphrasing & Rewriting
Pricing modelFreemiumFreemium
Starts at$12 month$4.99 month
Public APINoNo
PlatformsWeb, Chrome Ext, Windows, macOS, iOS, AndroidWeb
CompanySuperhumanTextglow
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

Textglow

Textglow does one thing narrowly well: rewrite whatever is already typed into a different tone without switching tabs, across ten preset tones from professional to flirty. At $4.99 a month it is priced as an impulse purchase rather than a serious productivity subscription, and the free tier's 10-rewrites-a-day limit is generous enough to actually test it.

Pros

  • Works directly inside Gmail, Slack, LinkedIn, and other sites without copy-pasting
  • 10 distinct tone options from professional to flirty
  • Sub-one-second response time claimed for rewrites
  • No signup required for the free tier, and no text is stored

Cons

  • Free tier caps rewrites at 800 characters, too short for longer emails
  • No company or founder name disclosed anywhere on the site

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 Textglow if you need

  • Anyone who writes frequently in Gmail, Slack, or LinkedIn and wants quick tone changes
  • Non-native English speakers wanting a fast tone check before sending
  • Users who want a cheap, narrow tool rather than a full writing suite

More comparisons

Browse all Grammar & Proofreading →