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Violentmonkey

An open-source userscript manager that runs your scripts in order and syncs them with the cloud service you pick.

Reviewed by Xplorekit's independent developer · Last checked · How we choose

Add to Chrome Open source (MIT) · Chrome Web Store · Official site · Source on GitHub

Why it's a strong pick

Violentmonkey is open source under the MIT licence, and its code is public on GitHub. The Chrome Web Store build is Manifest V3, as the official site states. The listing shows version 2.49.0, updated 16 September 2026. The trade-off: the store build needs a recent Chrome, and the developer shows no price.

What it does

Violentmonkey is a userscript manager. It runs small scripts that customize pages and automate tasks. It updates scripts automatically from their metadata and runs them in the order shown in your script list. It supports GM functions, which scripts use to talk to the extension, and it works with external editors.

Key features

  • Automatic updates. Scripts update from their own metadata.
  • Script order. Scripts run in the order shown in the list.
  • GM functions. The listing says GM functions are supported.
  • Import and export. Move your scripts as a zip file.
  • Sync. Sync with Dropbox, OneDrive, Google Drive or WebDAV.
  • External editors. The official site says it works with them.

Who it's for

Violentmonkey suits people who prefer an open-source userscript manager and script authors who want a clear script order. If you want the longest feature list with a built-in editor and sync options, compare Tampermonkey. If you need background or scheduled scripts, see ScriptCat.

Is Violentmonkey open source?

Yes. The code is public on GitHub, and the repository's licence file is MIT ("Copyright (c) 2017 Gerald"). The Chrome Web Store listing and the official site both describe it as open source. That lets anyone read how it works before installing.

Does Violentmonkey work with Manifest V3?

Yes. The official site says the Chrome Web Store build "has been updated to ManifestV3". Its release notes mention MV3 fixes between v2.46.2 and v2.49.0. Beta and MV2 builds are separate downloads on the developer's get-it page. The MV3 build needs Chrome 135 or newer, per the project's build script.

What permissions does Violentmonkey ask for?

The Chrome Web Store page does not list them. The project's build script for the MV3 build asks for access to all sites, plus tabs, webRequest, notifications, storage, unlimitedStorage, clipboardWrite, contextMenus, cookies, alarms, declarativeNetRequestWithHostAccess, identity, offscreen, userScripts and webNavigation. Downloads is optional. Check the install prompt for the current list.

FAQ

Is Violentmonkey free? The developer shows no price on the store listing or the official site. It is open source under the MIT licence.

Do I need an account? The developer does not say that an account is required. Cloud sync is optional.

What data does it collect? We did not read a privacy statement from the developer, so we make no claim. Read it before you install.

Good to know

The store build needs Chrome 135 or newer. If your Chrome is older, the MV2 build is a separate download from the developer's site, not from the store. The permission list is broad because userscripts need to run on many sites, so add only scripts you trust.

Other userscript managers to compare

Violentmonkey is one of 3 picks in our userscript managers guide:

  • Tampermonkey: built-in editor, many sync options. Source licence not stated.
  • ScriptCat: Tampermonkey-compatible, with background and scheduled scripts. Open source (GPL-3.0).

Related: developer tools.

Official sources

This is a third-party extension, not built or maintained by Xplorekit. We link to the official Chrome Web Store listing — install and permissions are entirely between you and the extension's own publisher.