It is made by the guys at netlify.com and works really well if you are hosted with them.
I believe you can set it up to work with just about any host though as it just hooks up to a git repo and lets you make changes via a UI that you host wherever you have the rest of your site.
I believe you can set it up to work with just about any host though as it just hooks up to a git repo and lets you make changes via a UI that you host wherever you have the rest of your site.