It's a web app - the Mac app is only an Electron wrapper. It works well on Windows/Mac/Linux/iOS/Android in the browser (I would know, I use it on all of those

It's a web app - the Mac app is only an Electron wrapper. It works well on Windows/Mac/Linux/iOS/Android in the browser (I would know, I use it on all of those personally). Self hosted would certainly be nice - I use their 'Export All' feature to keep a copy of my spaces for myself. Incidentally I got lazy a while back and my very basic homepage (https://tekacs.com/ https://tekacs.com/) on the web is actually a redirect to a page on Notion (yes it requires JavaScript and doesn't SEO well, but amusingly I can update it in realtime whilst you're looking at it ;P)