GreaseKit is a SIMBL plugin, that adds user scripting to Safari, Mailplane, Diet and all WebKit applications.

Google Groups

Nils Werner created GreaseKit-Users and GreaseKit-Developers on Google Groups.

Security Vulnerability

Sorry, GreaseKit 1.2-1.3 and Creammonkey 0.9-1.1 have security vulnerability. Please upgrade to a newer version.


GreaseKit-1.7.dmg (2008-09-22)


Past versions


First, Please install SIMBL.

Please copy "GreaseKit" bundle from the downloaded Disk Image.

And paste the copy in the ~/Library/Application Support/SIMBL/Plugins.

Relaunch your Safari.

Menu bar

If the installation is successful, you'll see "GreaseKit" on the menubar!


GreaseKit is hosted at Google Code.