Word prediction that is grammar smart and inventive spelling aware. Speech recognition allows you to speak it, and we'll write it.

Co:Writer promo image
What is Co:Writer?

Co:Writer is a very popular Chrome extension by This extension has 3,500,036 weekly active users, an average user rating of 2.82, and is most similar to Extensity and Read&Write for Google Chrome™. The latest version,, was updated 13 days ago.

Stats date:
Rating: 2.82 (105)
Version: (Last updated: 2023-05-15)
Creation date: 2020-06-06
Manifest version: 2
  • <all_urls>
  • tabs
  • notifications
  • unlimitedStorage
  • contextMenus
  • webRequest
  • webRequestBlocking
  • webNavigation
Size: 37.72M
Email: Click to see
Risk impact: Very high risk impact
Risk likelihood: Low risk likelihood

Other platforms

Not available on Firefox
Co:Writer (v4.9.2.519)
5 126,647
Co:Writer® Universal Extension for Chrome™ helps you write with proper grammar and spelling using topic-specific vocabulary. It integrates with the Chrome™ browser for word prediction and speech recognition just about anywhere you write online including Google Drive™, Microsoft Word, blogs, Learning Management Systems, testing, social networks, and email.

Try it for free and see if it works for you. Pricing and more information can be viewed at 

How Does Co:Writer Work?
As letters are typed, Co:Writer predicts the intended word with a selection of word suggestions using powerful grammar-smart word prediction. These suggestions can be read aloud by moving the cursor over the words. Selecting the intended word places it into the built-in writing document. For feedback while writing (and after writing) built-in text to speech can be used to read letters, words, sentences, and any selected text.  If the microphone is chosen, you can speak and we'll convert your speech into text.  

4+ Million Topic-Specific Dictionaries:
Co:Writer has access to a main prediction dictionary (that includes core words) and Topic Dictionaries (that includes topic specific words).  Co:Writer can access over 4 million topic-specific dictionaries which are activated based on the writing task.

A small sampling of the variety of topic dictionaries:
  ✔ America's Cup
  ✔ Compare and Contrast
  ✔ Dinosaurs
  ✔ Grumpy Cat
See more
User reviews
User reviews summary
These summaries are automatically generated weekly using AI based on recent user reviews. Chrome Web Store does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
  • Great predictive text
  • Useful for academic writing
  • Helpful for students with learning differences
  • Can assist with spelling and sentence structure
  • Slows down computer for some users
  • Doesn't work on some platforms
  • Lack of customization
  • Can be annoying with automatic capitalization
Most mentioned
  • Slows down computer
  • Useful for students with learning differences
  • Predictive text
  • Doesn't work on some platforms
View all user reviews
Risk impact

Co:Writer requires a lot of risky permissions and is not safe to use. Avoid installing this extension unless you absolutely trust this publisher.

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypass your security settings, and access your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Risk likelihood

Co:Writer has earned a fairly good reputation and likely can be trusted.

Risk likelihood measures the probability that a Chrome extension may turn malicious. This is determined by the publisher and the Chrome extension reputation on Chrome Web Store, the amount of time the Chrome extension has been around, and other signals about the Chrome extension. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Chrome extension, especially ones with higher risk impact and/or higher risk likelihood.

Subscribe to the premium plan to see more risk analysis details
Promo images
Co:Writer marquee promo image
Marquee promo image
Co:Writer large promo image
Large promo image
Co:Writer small promo image
Small promo image
Similar extensions

Here are some Chrome extensions that are similar to Co:Writer:

Extensity Extensity
User count: 350,341
Rating: 1,603
Quickly enable/disable Google Chrome extensions
Read&Write for Google Chrome™ Read&Write for Google Chrome™
User count: 10,000,000+
Rating: 1,910
Boost reading and writing confidence across all types of content and devices, in class, at work, and at home.
Atomic AI Atomic AI
User count: 1,415
Rating: 14
You Make a Lot of Content, We Make it Great.