---
title: "About – Extension Tracker"
description: "Extension Tracker is a free, public record of the Chrome Web Store for researchers and journalists, run by Web Iterate."
url: "https://extensiontracker.com/about"
---

# About

Extension Tracker is a public record of the Chrome Web Store. For every extension in the store, we record its number of users, rating, version, permissions and listing details. Extensions with 1,000 or more users are checked again every week, and the rest every month. We keep the full history, so you can see what changed, when it changed, and when an extension was removed from the store.

The site is built for researchers and journalists who study or report on browser extensions.

## Who we are

Extension Tracker is run by Web Iterate ([webiterate.dev](https://webiterate.dev/)), a lab that studies the technologies and decisions shaping the modern web, including privacy and security, browsers, extensions and open web standards.

## What we don't do

The site has no accounts and no paid tier. The data is free, and it will stay that way.

We don't publish developers' contact details, and we don't copy full descriptions, screenshots or reviews from store listings.

We don't judge whether an extension is safe. The site reports facts, such as permissions, changes and removals, and leaves the conclusions to you.

We never host or distribute extension packages. To read an extension's code or download it, extension pages link to [CRX Peek](https://crxpeek.com/), a separate tool we run, which fetches the package from Google.

## Funding

Extension Tracker doesn't take outside funding. If we ever add ads or sponsored links, they'll be clearly labeled, and they won't affect the data, the rankings or what we say about any extension.

## Reusing the data

You're free to reuse the data under the [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) license, as long as you credit Extension Tracker. Every extension page has a citation you can copy.

## AI agents and assistants

AI agents and assistants are welcome to read the site, and [/llms.txt](https://extensiontracker.com/llms.txt) gives them an overview. Every page except search is also available in Markdown. To get it, send `text/markdown` in the `Accept` header, or add `?format=md` to the address. The license applies to AI answers too, so an answer that uses the data should credit Extension Tracker and link to the extension's page.

## See also

[How the data is collected](https://extensiontracker.com/methodology) · [Collection status](https://extensiontracker.com/status) · [Data downloads](https://extensiontracker.com/data/) · [Contact and takedowns](https://extensiontracker.com/contact) · [Terms of use](https://extensiontracker.com/terms)

Extension Tracker isn't affiliated with Google. Chrome is a trademark of Google LLC.

---

From Extension Tracker, a public record of the Chrome Web Store: <https://extensiontracker.com/about>. It isn't affiliated with Google. The data is free to reuse under CC BY 4.0 (<https://creativecommons.org/licenses/by/4.0/>), crediting Extension Tracker. Every page except search comes as Markdown too: add `format=md` to the address, as in `https://extensiontracker.com/extension/{id}?format=md`.