Greasemonkey is not available for Mac but there are some alternatives that runs on macOS with similar functionality. The best Mac alternative is Tampermonkey, which is free. If that doesn't suit you, our users have ranked more than 10 alternatives to Greasemonkey and six of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Greasemonkey are FireMonkey, Stay - Userscripts Extension, Userscripts and Macaque.
Tampermonkey is a free browser extension and the most popular userscript manager for Blink- and WebKit-based Browsers like Chrome, Opera Next and Safari.
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.
Stay is a new generation browser script manager on Safari. It supports both native scripts and tampermonkey and violentmonkey scripts.
Macaque is a UserScript Manager Browser Extension. Macaque provides you the ability to add, edit, remotely edit, as well as view the console logs for each UserScript!.
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