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Compose AI vs Jetwriter AI

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. Jetwriter AI publishes a starting price ($18); Compose AI does not. Both have a free tier.

Compose AIFree Chrome extension that autocompletes sentences and email replies as you type across the webJetwriter AIBrowser extension that drafts emails and replies anywhere

Side by side

FactCompose AIJetwriter AI
CategoryAI Writing AssistantsEmail Writing
Pricing modelFreemiumFreemium
Starts at—$18 month
Public APINoNo
PlatformsChrome ExtWeb, Chrome Ext
CompanyCompose AI, Inc.Jetwriter AI
Launched20212022
Last verifiedSep 6, 2026Sep 6, 2026

What our research says

Compose AI

A low-friction way to speed up routine email and doc writing, since the free tier installs in a minute and completes sentences anywhere in Chrome. The catch is stagnation risk: the site's own copyright is frozen at 2024 and browser-native AI features increasingly do the same job for nothing.

Pros

  • Basic extension is free with no time limit
  • Autocomplete works across most web text fields, not one app
  • Learns personal writing style for suggestions

Cons

  • Chrome-only, with no API or desktop apps
  • Official pricing was unreadable in this check, an odd sign for a paid product
  • Site freshness signals suggest limited ongoing development

Jetwriter AI

The right shape if your writing happens inside Gmail, LinkedIn and support tools and you resent tabbing out to a chat window. For long-form documents it is the wrong tool entirely.

Pros

  • Learns tone from your own Gmail history rather than a generic style picker
  • Three model vendors covered by a single subscription
  • Works on arbitrary web pages, not just a fixed list of supported apps
  • Free tier is genuinely usable for occasional drafting

Cons

  • Free plan is 15 responses a month with no advanced-model access
  • $18/month is steep beside assistants already bundled into Gmail and Outlook
  • No developer API
  • Safari and Firefox builds still have not shipped

Which one fits

Choose Compose AI if you need

  • Heavy email writers who churn out routine replies in Gmail
  • Non-native English speakers who want inline phrasing help
  • Anyone testing writing autocomplete without paying

Choose Jetwriter AI if you need

  • High-volume email and LinkedIn reply drafting
  • Support agents composing responses inside Zendesk or Outlook
  • People who want GPT, Claude and Gemini from one extension

More comparisons

All Compose AI alternatives →All Jetwriter AI alternatives →Browse all AI Writing Assistants →