Tampermonkey alternatives in 2026: 6 options compared

Tampermonkey is the best-known way to run userscripts, but it isn't the only one. Some alternatives are open source, some run in browsers Tampermonkey doesn't, and a newer kind writes the script for you instead of running one you found.

Everything said here about other products comes from each product's own website or store listing as read on 23 October 2026. We haven't tested claims we couldn't see, and these products change often, so check before you decide.

First, what kind of tool do you need?

There are two different jobs here:

• Running scripts that already exist. You've found a script on Greasy Fork, or written one, and you need something to run it. That's a userscript manager: Tampermonkey and the first four options below.
• Getting a script that doesn't exist yet. You know what you want a site to do and can't find a script for it. That's an AI builder: the last two options.

If you're not sure what a userscript is, start with What is a userscript?

Violentmonkey

Violentmonkey's site calls it "an open source userscript manager". It's available for Chrome, Firefox and Edge, and the site notes that the Chrome Web Store version has moved to Manifest V3. It also says the extension contains no ads.

Pick it if you want an open-source manager for the browsers most people use, to run scripts you already have.

ScriptCat

ScriptCat describes itself as an "open-source userscript engine" that is "Tampermonkey-compatible", supporting the usual userscript format and GM functions so existing scripts move over unchanged. It runs on Chrome, Edge and Firefox. Its stand-out claim is that scripts can keep running without an open tab, including on a timed schedule.

Pick it if you want an open-source, Tampermonkey-compatible manager, or you need scripts that run on a timer rather than on a page you're looking at.

Greasemonkey

Greasemonkey is the original userscript manager, and it's for Firefox, including Firefox for Android. Its listing on Mozilla's add-ons site gives an MIT licence and doesn't mention a Chrome version.

Pick it if you use Firefox and want the classic option.

Userscripts (for Safari)

Userscripts is "an open-source userscript manager for Safari", for macOS and for iPhone and iPad, installed from Apple's App Store. Its project page lists macOS 12 with Safari 14.1 or later, and iOS 15.1 or later.

Pick it if you use Safari, especially on an iPhone or iPad, where the others don't run.

Robomonkey

Robomonkey's Chrome Web Store listing, as read in October 2026, describes an AI-powered extension and userscript builder for automations and web scraping. It says it works as a userscript manager too, and that it works with most scripts written for Tampermonkey and Greasemonkey. It's free to install with in-app purchases.

Pick it if you want an AI builder that can also run the scripts you've collected. We compare it with ScriptPanda in detail in Robomonkey alternative: ScriptPanda compared.

ScriptPanda

ScriptPanda is our Chrome extension, so weigh this section accordingly. It builds the script from a description: you open its side panel on the site, say what you want in plain English, and it reads a trimmed outline of the page, writes the userscript, installs it and runs it. If the site changes and the tool breaks, you ask it to fix the tool for the page as it is now.

It isn't a manager for scripts you've collected. It doesn't run existing Tampermonkey scripts, and it builds one tool per page, which runs while the page is open. It has paid plans, shown on the pricing page.

Pick it if you know what you want a site to do and there's no script for it. Many people keep Tampermonkey for published scripts and use ScriptPanda for the rest, as ScriptPanda vs Tampermonkey explains.

Side by side

	Runs existing scripts	Writes scripts for you	Browsers	Open source
Violentmonkey	Yes	No	Chrome, Firefox, Edge	Yes
ScriptCat	Yes	No	Chrome, Edge, Firefox	Yes
Greasemonkey	Yes	No	Firefox	Yes, MIT
Userscripts	Yes	No	Safari on macOS, iPhone, iPad	Yes
Robomonkey	Most, it says	Yes	Chrome	Not stated
ScriptPanda	No	Yes	Chrome 138+	No

One setting they all share in Chrome

Whichever you choose, Chrome only lets an extension run scripts you supply once you've turned on Allow User Scripts for it, on its details page in chrome://extensions. If a new manager seems to do nothing, that's almost always why. See Userscripts not working in Chrome?

The short version

To run scripts that exist, choose a manager for your browser: Violentmonkey or ScriptCat for Chrome, Edge and Firefox, Greasemonkey for Firefox, Userscripts for Safari. To get scripts that don't exist yet, try an AI builder on the exact page you want to change.