This app looks very promising, but it lacks many english words in interface even if you've switched to english in the setting. And I doubt that you will get any support, and the app will be in constant development in the near future or ever.
On GitHub, there are a lot of reported issues, almost all of them in an Asian language, not English, so I can’t understand. Thus I think trying out this blogging system would be a waste of time for me.
Our users have written 2 comments and reviews about Gridea, and it has gotten 3 likes