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Oooh, you should make this into a cheaper version of intercom. It's way too pricey for me and all the other alternatives are ugly

Funny you say that, that's how this project started! I've got the work in progress here https://github.com/kingofthestack/slackchat

If you are you using it for your personal project. I can offer you a free plan on https://www.getchannel.co/

disclaimer: I am the maker.