Compose AI

Browser writing extension that automatically completes sentences where you type and provides personalized suggestions in your tone. Officially, it can save about 40% of writing time. It has been used by more than 10,000 teams and 400,000 users, and is available for free installation.

AI Text Tools#Writing#Browser Extension#Completion

Updated: 2026-10-26

What is Compose AI?

Compose AI is an AI writing tool and browser extension, officially positioned as "auto-completing right where you type" — it's suitable for writing emails, creating documents, and chatting. It can auto-complete sentences in almost all web input boxes and provide personalized wording suggestions based on your writing tone. The official claims it can reduce writing time by about 40%. Official data shows that more than 10,000 teams and 400,000 people use it, and it can be installed and used for free. This "on-the-spot completion" form complements independent writing software: you don't need to change your work habits or move content around; you can get AI assistance in the original input box with almost zero learning cost. The official FAQ also specifically answers questions about pricing and privacy. It's worth reading before installation to clarify the free scope and data usage methods.

Who is it for?

Knowledge workers who frequently write emails, customer service replies, documents and messages on web pages; ordinary users who want to quickly generate English (and other languages) text without switching to independent writing software; and enterprises that hope to unify team writing experience and improve reply efficiency. For positions that need to handle a large number of repetitive English replies every day (customer service, sales, operation), such tools bring intuitive time savings and make it easiest to quantify input and output.

Key features

Global Auto-Completion

Automatically completes sentences in various web input boxes, covering email, document and chat scenarios without the need to switch tools.

Personalized Tone

The official claims that the platform will learn your tone and provide wording suggestions that match your personal style, making the output more like your own.

Text Generation

Use AI to generate any paragraph content. It is not limited to completion and can also handle the need to generate an entire paragraph.

Seamless Integration

The official emphasis is on not disrupting existing tools and workflows; after installing the extension, it takes effect directly where you originally work.

Free to Use

The official version allows free installation and usage, and many teams also promote it as a unified writing tool within enterprises.

How to use Compose AI

Position it as a "typing accelerator" rather than a "content author": start the sentence yourself first and let it complete the content within the sentence, which achieves the best efficiency and controllability.
For team scenarios, conduct a pilot on a small scale first, unify the conventions for handling sensitive information, and then decide whether to promote it to all members.
Spend a little time getting familiar with its shortcut keys and toggle methods after installing the extension.
You can quickly turn off the completion when privacy protection is needed to avoid accidental triggers.
In addition, remember to regularly clean up the extension cache and history, and keep an eye on whether the official has updated the data usage policy.

Things to know

As a browser extension, it needs to read the text context of the current page to provide completion suggestions. For input boxes containing sensitive information (passwords, financial data, privacy content), it is recommended to turn off completions or use them cautiously.

The differences in quotas and functions between the free version and the paid version shall be subject to the latest official website instructions. The official claims it is "free", but there may be limits on usage and advanced features.

The quality of auto-completion suggestions depends on the quality of the context; if sentences are too vague or contain many typos, the suggestions may deviate significantly.

It is recommended to manually verify the facts and tone of the generated content, especially for official emails sent externally and customer communications, as the AI's wording may be overly enthusiastic or inappropriate.

The extension stays resident with the browser. Keep an eye on its updates and permission changes, and check the authorization scope on the extension management page if necessary.

It runs on a browser environment, requiring reinstallation and relogin when switching browsers or devices, and its cross-device workflow is not as smooth as that of cloud-based writing tools.