Violentmonkey is not available for Mac but there are a few alternatives that runs on macOS with similar functionality. The best open source Mac alternative is FireMonkey. If that doesn't suit you, our users have ranked more than 10 alternatives to Violentmonkey and three of them are open source and available for Mac so hopefully you can find a suitable replacement. Other interesting open source Mac alternatives to Violentmonkey are Userscripts and Man in the Middle.
Firemonkey is a totally new combined user-Scripts and user-Style manager. While it has similar functions to other user-Script managers like GreaseMonkey/Tampermonkey/Violentmonkey, and user-CSS managers like Stylish/Stylus/xStyle, there are also differences.
