Compose AI
Compose AI is a Chrome extension that writes with you: type // anywhere to generate text, press Tab to accept autocompletions, and rephrase or reply to emails in a click. The plugin is free, with a paid premium tier.
What is Compose AI?
Compose AI is an AI writing assistant delivered as a Chrome extension by COMPOSE.AI, INC., a company based in San Francisco, California. Rather than opening a separate editor, you keep writing where you already write and the tool works inside the page. Typing // in any input field opens a prompt and generates text on the spot; pressing Tab accepts an autocompletion the extension has suggested. The homepage sums the promise up as a personal writing assistant that cuts your writing time by 40%, and organises the product around three claims: autocomplete everywhere, personalisation of your writing style, and unobtrusive integration with the tools you already use.
Beyond raw generation, the extension carries a small set of well-defined functions. Compose Now, opened with Option+G or Alt+G, drafts messages from a short instruction. Easy Email Reply answers an incoming email in one click, reusing the original message as context. Rephrase reworks a highlighted passage to make it shorter, longer, friendlier or more formal. Chat with Compose reads the page you are on, which is how the recruiting scenario works when you write to a candidate from their profile.
The tool is designed for the places people actually type. Gmail, Google Docs and WhatsApp are named explicitly, and LinkedIn, Facebook and Instagram each get a dedicated page on the site, alongside four use-case pages covering copywriting, blogging, recruiting and social media. Requests for new site integrations go through a public feedback board.
The audience is real rather than aspirational: the Chrome Web Store listing showed 300,000 users, a 4.1 out of 5 rating across 244 reviews and a Featured badge when this record was compiled, while the homepage claims 10,000 teams and 400,000 people. Commercially, the model is freemium — the plugin is described as free forever, with a premium tier unlocking advanced features including part of the personalisation. One caveat belongs in any description of the product: the extension is at version 2.1.1, last updated on 2 January 2025, the site still carries a 2024 copyright and the privacy policy dates from 2021.
What it does
- Generate any text on the spot by typing // in whatever field you are already writing in
- Autocomplete sentences as you type and accept a suggestion with the Tab key
- Draft a full email from a few words with Compose Now, opened with Option+G or Alt+G
- Reply to an incoming email in one click, with the original message used as context
- Rephrase a highlighted passage to make it shorter, longer, friendlier or more formal
- Use the content of the page you are on, such as a candidate profile, through Chat with Compose
- Learn your personal writing style over time and suggest phrasing that sounds like you
When to use Compose AI / When not to
A quick filter to help you decide if Compose AI is the right fit.
When to use Compose AI
- Recruiters and sourcers who write job adverts and personalised candidate outreach directly inside LinkedIn
- Copywriters and marketers producing headlines, product descriptions and calls to action all day long
- Bloggers and content managers who need help finding angles, structuring posts and tightening drafts
- Social media and community managers drafting posts and replies across Facebook, Instagram and LinkedIn
- Anyone who lives in Gmail, Google Docs or WhatsApp inside Chrome and spends most of the day typing
When not to use Compose AI
- People who work in Firefox, Safari or Edge: only a Chrome extension is offered
- Mobile-first users, since there is no iOS or Android app and no desktop application
- Developers looking to call the tool from their own product: no API and no developer documentation exist
- Organisations with a European compliance checklist, as the site never mentions the GDPR and publishes no DPA
- Teams that need to know the price before committing, because no amount is published in readable form
How to use Compose AI
A typical end-to-end flow, from setup to results.
- Install the extension from the Chrome Web Store using the Install Extension or Add to Chrome button
- Create an account with Sign Up or connect an existing one; the Terms mention signing in through a third-party account such as Google
- Open welcome.compose.ai to try the tool live before using it in your own tools
- Place your cursor in any text field, on any site where you normally write
- Type // to open the prompt, write your instruction and press Enter to generate the text
- Press Tab whenever an autocompletion appears and you want to accept it
- Press Option+G, or Alt+G on Windows, to open Compose Now and draft a full message
- Highlight an existing passage to trigger Rephrase and pick a shorter, longer, friendlier or more formal version
- Turn on Chat with Compose from the settings, or type // and scroll down the popup, to use the current page as context
- Manage billing through the Chrome puzzle icon: Manage Extensions, then Compose AI, then Update Plan at the bottom
Pros & Cons
Pros
- The plugin is described as free forever, so trying it costs nothing
- One trigger, //, works across every site: no tool switching and no copy-pasting
- It runs inside the tools people already use, from Gmail and Google Docs to LinkedIn and WhatsApp
- Installation takes one click from the Chrome Web Store, with no configuration and no API key
- A genuine installed base of 300,000 users and a Featured badge on the Chrome Web Store
- Google's own badges confirm the extension is published by the owner of the site, with no record of violations
- A published 7-day refund policy and a step-by-step cancellation guide in the help centre
Cons
- Chrome only: no other browser, no mobile app and no desktop application
- No price is readable anywhere, because the pricing page renders its amounts in JavaScript
- No API and no developer documentation, so the tool cannot be embedded elsewhere
- Signs of ageing: extension last updated on 2 January 2025, a 2024 site copyright and a privacy policy from 2021
- No GDPR coverage at all: no mention, no DPA, no Article 27 representative, no hosting country
- A single published contact address and no contact or about page on the site
- Only English is declared as an interface language on the Chrome Web Store listing
Pricing & Plans
A permanent free plan is available: the plugin is described as free to use forever, and the Chrome Web Store listing indicates that in-app purchases are offered. A paid premium tier exists and unlocks advanced features, including part of the personalisation capability. No entry price can be quoted here: the pricing page publishes no amount in its served content, and none was found on the help centre, the use-case pages or their FAQs. Payments are processed by Stripe, subscriptions renew automatically, no pro rata refund is given for an interrupted period, and a 7-day refund policy is documented in the help centre.
- Free plugin
- presented as free to use forever
- Premium version
- with advanced features including part of the personalisation capability
- no plan name
- amount or billing period is published
Data, GDPR & hosting
A consolidated view of how Compose AI handles your data.
GDPR overview
There is no GDPR implementation to report, and the absence is total rather than partial: the words GDPR and General Data Protection Regulation appear nowhere on compose.ai, in the visible text or in the underlying HTML of the fifteen pages collected. The privacy policy is written entirely for United States law and cites the California Consumer Privacy Act, California Civil Code sections 1798.83 to 1798.84 and Nevada Revised Statutes chapter 603A. No Article 27 representative is designated, no data protection officer is named, no Data Processing Agreement is published or offered, no subprocessor list is maintained and no standard contractual clauses are mentioned. Every privacy request goes to a single address, support@compose.ai. The only European element found anywhere is the trader declaration on the Chrome Web Store listing, which is a marketplace requirement rather than a data protection commitment.
Who owns the data?
The Terms make Compose AI the owner of the Services themselves, while users remain responsible for the content they contribute and warrant they hold the rights to it. Users get a worldwide, non-exclusive, non-transferable licence to use the Services, nothing more. On personal data, the privacy policy in force since 5 May 2021 lets the company collect, use and share information with hosting and communication providers, the payment processor Stripe and analytics partners including Google Analytics, Mixpanel and Segment.io. The homepage promises the company will never sell user data, and the Nevada section confirms no sale currently takes place. One clause matters: in a merger, acquisition or bankruptcy, all personal data may pass to the acquiring party.
Reuse rights
Nothing in the Terms restricts what users do with the text Compose AI produces for them: the restrictions target the Services and the site's own Content, which may not be copied, resold, reproduced or exploited outside normal use of the product. There is no separate output-ownership clause, no attribution requirement and no commercial-use licence for generated text. The one caveat is broader: the Terms state that the Services are for the user's own internal, personal and non-commercial use, and not on behalf of a third party, which sits awkwardly with the recruiting and copywriting scenarios the site itself promotes. On the company's side, text typed by the user is described as serving only to produce the best possible autocompletions, and improving the Services through testing, research and internal analytics is listed as a declared purpose. Anonymised or aggregated data may be shared with third parties.
Data retention & training
Hosting summary
The vendor documents nothing about where data is hosted. The privacy policy refers only to categories of suppliers, namely hosting, technology and communication providers, without naming a single one or identifying a country or region. There is no trust page, no security page and no subprocessor list on the site. What is known comes from named third parties rather than a hosting statement: Stripe processes payments, and Google Analytics, Mixpanel and Segment.io handle analytics on the website and the extension. A network lookup carried out for this record resolved the domain to 216.150.1.1, geolocated in the United States on Amazon infrastructure, with the address flagged as anycast; this is an observation about the public website, not a declaration by the company, and it says nothing about where user text is processed or stored. Since the company is Californian and its Terms are governed by the law of the State of California, United States jurisdiction is the reasonable working assumption, but it is not stated anywhere.
Things to keep in mind
Risks and trade-offs to weigh before adopting Compose AI.
- The extension declares broad Chrome permissions covering personal communications, browsing history, website content, user activity and location: it sees what you write and where you write it
- No published position on whether the text you type is used to train AI models, which leaves an important question open
- Leaning on autocompletion for every message gradually erodes the habit of composing your own sentences, and the loss shows up first in the writing that matters
- Generated text reads fluently whether or not it is accurate: replies drafted from an email thread still need to be read before they are sent
- The tool inserts itself in professional contexts such as candidate outreach and client email, where a generic phrasing can be recognised for what it is
- Personalisation that learns your voice implies your past writing is retained and analysed; the privacy policy sets no time limit on retention
- Signs of a stalled product: last extension update in January 2025, 2024 copyright, 2021 privacy policy, so budget for the possibility that support fades
Setup & Integrations
Technical difficulty
Very easy. Installation is a single click from the Chrome Web Store for a 24.73 MB extension, followed by creating an account or signing in through a third-party account. There is no configuration step, no API key and nothing to deploy. A live try-out page and a tutorial video are available for the first steps. The only detail that catches people out is billing: there is no web customer area, and subscription management runs through the Chrome extensions panel instead.
Deployment
Integrations
Supported languages
Behind Compose AI
Fundraising
Social
Resources
All the official URLs gathered for verification and reference.
Frequently asked questions
What is Compose AI?
How do I activate it while writing?
Is Compose AI free?
Which sites and apps does it work on?
Is there a mobile app?
Is there an API?
How do I contact support?
Is there a minimum age?
How do I manage or cancel my subscription?
Is my text sold or used to train models?
Should you pick Compose AI?
Compose AI does one thing and keeps its scope deliberately narrow: it puts an AI writing assistant inside the browser tab you are already working in, behind a single // trigger, and adds autocompletion, rephrasing and one-click email replies around it. That focus is its main strength. There is nothing to configure, no API key, no second window, and the free plugin makes the cost of trying it effectively zero. With 300,000 users and a Featured badge on the Chrome Web Store, it is a real product with a real audience, not a landing page.
The reservations are just as concrete. The extension has been at version 2.1.1 since 2 January 2025, the site still carries a 2024 copyright and the privacy policy has not moved since 2021, which is a long time for a product category that changed completely in between. Anyone in Europe should note that the GDPR is never mentioned anywhere on the site, that no Data Processing Agreement or subprocessor list is published, and that no hosting country is disclosed. Pricing is opaque in a specific and avoidable way: the pricing page exists but renders its amounts in JavaScript, so no figure can be quoted without opening it in a browser. The claims on the four use-case pages, which promise real-time analytics, interview scheduling and multilingual translation, are corroborated nowhere else and should be treated as marketing rather than documented features.
For an individual who types all day in Chrome and wants faster drafts, it is worth the ten seconds the install takes. For a team with a procurement checklist, a compliance requirement or a need to budget the spend in advance, the missing documentation is a genuine obstacle.
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