It's mainly between HarpJS.com and harp.io, where on HarpJS there's a command line utility that works like a static site generator, and on harp.io it's hosted.

It's mainly between HarpJS.com and harp.io, where on HarpJS there's a command line utility that works like a static site generator, and on harp.io it's hosted. I think it works pretty well that way, just like Wordpress has a self-hosted platform as well as a hosted one.