Sorry about that, I am currently updating it and I will upload some questions the following days.

There's an open source instance you can self-host on your home server or work, but there's also a cloud version.

About obsidian.md now, it's a great, smart and extensible piece of software but its type of usage is slightly different from wreeto. I don't know If obsidian.md has a cloud or a server version to be honest. Plus the roadmaps of the two (will upload wreeto's as well) is different.