Greasemonkey Alternative for Chrome — An Honest Guide
Greasemonkey is one of the best-known browser customization tools — but it runs only on Firefox. If you are on Chrome and searching for a Greasemonkey alternative, this honest guide explains what Greasemonkey is, what the Chrome-world equivalents are, and how to pick the one that fits how you work.
What Greasemonkey is
Greasemonkey is the original userscript manager. A userscript is a small piece of JavaScript that runs automatically on the pages you choose — to tweak layout, add a feature, remove an annoyance, or automate a click. Greasemonkey popularized the format so thoroughly that userscripts are still sometimes called "Greasemonkey scripts."
It deserves credit: it is open source, it created a standard that other tools adopted, and it is still maintained for Firefox. The only real limitation for our purpose is the obvious one.
The catch — Greasemonkey is Firefox only
Greasemonkey is a Firefox extension and is not available for Chrome, Edge, Brave or other Chromium browsers. There is no official Chrome port and no plan for one. So if you are on Chrome, you are not looking for "Greasemonkey for Chrome" — there is no such thing — you are looking for a tool that does the same job. Good news: several do.
Tampermonkey — the popular Chrome choice
Tampermonkey is the most widely used userscript manager on Chrome. It runs the same standard userscript format Greasemonkey uses, so the vast majority of scripts from catalogs like Greasy Fork install and run without changes. It has a mature editor and supports the privileged GM_* APIs.
Pick Tampermonkey when: you want the closest Chrome equivalent to Greasemonkey and your main goal is installing community userscripts.
Violentmonkey — open source, same model
If being open source matters to you — and for many Greasemonkey users it does, since Greasemonkey itself is open source — Violentmonkey is the natural pick. It is MIT-licensed, runs the same userscript format, supports the common GM_* APIs, and works across Chromium browsers and Firefox. In day-to-day use it is very close to Tampermonkey.
Pick Violentmonkey when: you want the userscript workflow on Chrome with a fully open-source codebase.
JustZix — a rule-based approach
JustZix solves the same underlying problem — "make this page behave the way I want" — with a different design. Instead of script files carrying a // ==UserScript== metadata header, you create rules matched on URL patterns, and each rule can hold both CSS and JavaScript. It is free, works on Chrome and other Chromium browsers, and needs no account.
A userscript and a JustZix rule express the same idea in different shapes. The userscript way:
// ==UserScript==
// @match https://example.com/*
// ==/UserScript==
document.querySelector('.ads').remove();The JustZix way — URL pattern https://example.com/* set in the rule, and in the JS pane simply:
document.querySelector('.ads').remove();What JustZix adds on top of the basic injection:
- Folders, groups and rules — a real hierarchy rather than a flat list of scripts.
- In-tab developer windows — a CSS pane, a JS pane, a JS Console REPL and a six-tab Output Console with Network and DataLayer views — so you build and debug on the live page.
- A one-click action bar and a
window.JZAPI for triggering things on demand. - Optional cross-device sync via a locally generated key — the backend keeps only a SHA-256 hash of it — and rule-bundle sharing through short links with a 1–48h TTL.
- No telemetry.
See the full list on the features page. Pick JustZix when: you want CSS and JS together, prefer URL-pattern rules over script headers, and value built-in dev tools plus no-account sync and sharing.
One honest difference — the script catalog
We will be straight about this. Greasemonkey, Tampermonkey and Violentmonkey all tap into the same large catalog of community userscripts on Greasy Fork. If your plan is "install scripts other people wrote," a userscript manager is the right tool, and Tampermonkey or Violentmonkey is your Chrome answer. JustZix does not aim to replace that catalog — it is built for writing and organizing your own CSS and JS as rules.
How to pick
| You want to... | Use |
|---|---|
| Install community userscripts on Chrome | Tampermonkey or Violentmonkey |
| Same, but fully open source | Violentmonkey |
| Write your own CSS + JS, organized as rules | JustZix |
| Sync and share tweaks without an account | JustZix |
| Stay on Firefox specifically | Greasemonkey (or Violentmonkey) |
The short version
There is no Greasemonkey for Chrome — but there are good equivalents. For the classic userscript experience, Tampermonkey and Violentmonkey are excellent and well respected. If you would rather manage your own CSS and JavaScript as URL-pattern rules with built-in dev tooling, JustZix is worth a look. None of these is "the loser" — they just suit different habits.
See also
If the rule-based approach matches how you like to work, JustZix is free and installs in a couple of minutes — visit the download page to try it, no account required.
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