Supabase is an open source Firebase alternative. We're building the _features_ of Firebase using open source tools: Postgres Database, Authentication, auto-generated APIs (PostgREST), Realtime subscriptions, and File Storage.
It is not clear to me what Coda is. They certainly do not mention it at the site. It looks like some form of IDE but there no other information. I am not going to go through the tutorials without some simple explanation of what it is and where it is applicable.
The Mac App Store icon infers that it's a Mac app. As for languages, you're right that it isn't clear. Having said that, the main window is a text editor which performs highlighting on all of the major web languages (in Coda 1.x anyway).
If you're not a Mac user, how would you know what the App Store icon looks like?
There was nothing in the Help/FAQ either, so it wasn't until I manually navigated to panic.com, seeing that they do Apple apps, that I finally got pretty sure it wouldn't be available for my platform.
There comes a point where preparing for all levels of pedantry isn't wise and it's fine for people to assume a certain level of knowledge/experience from their target audience especially if their target audience isn't everyone.
