Looks like this is the source code.
https://github.com/digi-monkey/flycat-web
Looks like they already have some community support built in. The ecosystem is going so fast. I’ve hardly opened up a text file to start my own and there are like 4 others. The nip isn’t even merged.
This one is super simple. You can create a user, create a community and start posting.
Running a trusted cell phone app is pretty safe like Amethyst. For web apps it’s recommended to use a browser plugin. The plugin signs your messages locally and offers them to the website so the webserver never needs to see your private key. I don’t think this webapp supports them yet. I use NOS2X-FOX and it works well with https://primal.net I believe it works with https://iris.to as well.