This looks cool. I think it could resolve some of the noise at the company I work for. For example, a lot of #javascript-specific chat happens in the #developers channel, but we have a #javascript channel. This is actually really annoying. I think people would more easily recognize they should put the message into #javascript if they could clearly see the dev -> javascript stream structure. Hopefully anyway. There's no way our company would migrate to Zulip though.

> Zulip has modern apps for every major platform, powered by Electron and React Native.

I'm not sure the underlying technologies matter to most users. This might not be good marketing, but I don't know. I know someone could have chosen to use this language with reason but figured I'd put it out there just in case.