Compose AI and ParagraphAI both speed up everyday writing with AI autocomplete, but they differ in scope and platform reach: Compose AI is a narrowly focused,…
Best for Compose AI: Users who primarily type in the browser and want unlimited, free sentence and email autocomplete that learns their personal writing voice, without needing mobile or translation features.
Best for ParagraphAI: Users who write across mobile and browser, need grammar correction, tone editing, or translation in 40+ languages, and are willing to pay for unlimited daily use beyond the capped free tier.
At a Glance
Compose AI
ParagraphAI
Primary category
AI
AI
Rating
Not documented
Not documented
Pricing model
Freemium
Freemium
Starting price
Free
Free (Pro plan from $12.49/month billed annually)
Free plan
Yes
Yes
Free trial
Not documented
Not documented
Platforms
Web
iOS, Android
Team collaboration
Not documented
Not documented
AI features
Yes
Yes
Public API
Not documented
Not documented
Key Differences
Platform Breadth
Compose AI: Only available as a Chrome browser extension.
ParagraphAI: Available as a Chrome extension plus iOS and Android mobile apps with cross-device sync.
Mobile availability matters for users who write on the go, such as texting or mobile email.
Free Tier Depth
Compose AI: The core autocomplete plugin is free to use forever with no stated usage cap.
ParagraphAI: The free plan is capped at 5 daily uses of Create/Fix/Reply/Edit and a 1,000-character input limit.
Free-tier usage limits affect how much daily writing volume a non-paying user can realistically get done.
Language & Translation Support
Compose AI: No language or translation support is documented beyond English autocomplete.
ParagraphAI: Supports 40+ languages for input, output, and translation.
Multilingual writers and translators need broad language coverage.
Feature Scope
Compose AI: Focused narrowly on autocomplete and personalized phrase suggestion.
ParagraphAI: Documents a wider range of writing features: grammar correction, tone/length editing, AI humanization, summarization of web pages and PDFs, and templates.
Broader feature scope suits users who need more than sentence completion, like summarizing documents or adjusting tone.
Pricing Transparency
Compose AI: Premium plan pricing is not publicly disclosed.
ParagraphAI: Publishes clear pricing: $24.99/month or $12.49/month billed annually for Pro, plus a custom Enterprise tier.
Transparent pricing helps buyers budget without contacting sales.
Feature-by-Feature
Writing Assistance
Feature
Compose AI
ParagraphAI
Sentence/email autocomplete
Available
Available
Grammar correction
Not documented
Available
Tone/formality/length editing
Not documented
Available
AI humanization
Not documented
Available
Summarization
Not documented
Available
Personalized writing voice
Available
Not documented
Platforms & Language Support
Feature
Compose AI
ParagraphAI
Browser extension
Available
Available
Mobile app (iOS/Android)
Unavailable
Available
Multi-language translation
Not documented
Available
Pricing & Plans
Feature
Compose AI
ParagraphAI
Free forever tier
Available
Available
Published premium pricing
Unavailable
Available
Enterprise plan
Not documented
Available
Pricing Compared
Starting price reflects the lowest paid tier, not the full cost for every team size or usage level.
Compose AI
Free — Free N/A
Premium — Not publicly disclosed N/A
ParagraphAI
Free — $0 N/A
Pro — $24.99/month billed monthly, or $12.49/month billed annually ($149.88/year) Monthly or annual
Enterprise — Custom (contact sales) Custom
Pros & Cons
Compose AI
Pros
Free to use indefinitely for core autocomplete functionality
Works across virtually any website rather than being locked to one app
Lightweight and fast compared to switching to a full separate AI writing tool
Backed by Y Combinator with a large reported user base (400,000+ users)
Cons
Limited to the Chrome browser, with no native desktop, iOS, or Android app
Narrower feature set than full AI writing platforms (no long-form generation, grammar scoring, or SEO tools)
Premium tier pricing is not publicly disclosed
Company size and update cadence are not transparently published, making long-term support harder to verify
ParagraphAI
Pros
Works across mobile apps and the browser via a keyboard and extension, not just a single editor
Simple four-function model (Create, Fix, Reply, Edit) is easy to learn
Annual Pro pricing undercuts some comparable writing assistants
Broad language support (40+) for non-English writers
Free plan available to try core features before upgrading
Cons
Free plan is limited to a small number of daily uses and a 1,000-character cap
Smaller brand recognition and integration ecosystem than Grammarly
Enterprise pricing is not publicly disclosed
Character limits even on Pro (10,000) may constrain long-form writing use cases
Keyboard-based mobile writing tools can raise data-privacy considerations for sensitive text
Use Cases
Choose Compose AI: Users who primarily type in the browser and want unlimited, free sentence and email autocomplete that learns their personal writing voice, without needing mobile or translation features.
Choose ParagraphAI: Users who write across mobile and browser, need grammar correction, tone editing, or translation in 40+ languages, and are willing to pay for unlimited daily use beyond the capped free tier.
Need both: Someone who wants free, always-on browser autocomplete from Compose AI for daily typing but also needs mobile writing support and translation for specific tasks might keep both installed.
Compose AI
Faster email replies — Generate a full email draft from a short phrase or set of bullet points instead of typing the whole message manually.
Consistent tone across web writing — Rephrase drafts to be friendlier, more professional, shorter, or longer directly inside whatever website you're writing in.
ParagraphAI
Everyday mobile writing help — Texting, email and social replies polished on the go from a phone keyboard.
Professional email and business writing — Drafting and polishing work correspondence quickly across apps.
Brand-consistent team writing — Enterprise brand-voice customization keeps team writing on-tone.
Frequently Asked Questions
Is Compose AI or ParagraphAI free?
Compose AI's core Chrome plugin is free to use forever. ParagraphAI also has a free plan, but it's capped at 5 daily uses of Create/Fix/Reply/Edit and a 1,000-character input limit.
Which tool works on mobile devices?
ParagraphAI is available as iOS and Android mobile apps in addition to a browser extension. Compose AI is only available as a Chrome browser extension.
Which tool supports more languages?
ParagraphAI supports 40+ languages for writing and translation. Compose AI does not document language or translation support.
How much does ParagraphAI's Pro plan cost?
$24.99/user/month billed monthly, or $12.49/user/month billed annually ($149.88/year).
Is Compose AI's premium plan pricing public?
No, Compose AI's premium plan pricing is not publicly disclosed on the site; only the free core plugin's availability is confirmed.