I've been trying to find a Slack replacement since Salesfarce started ruining it and I must have tried out maybe 50 potential replacements, paid and free. This is the first self-hostable, open source one I've seen that doesn't look like design is the very last item on an amorphous future roadmap. In fact, there's some really nice design and UX touches in Chatto. Congrats on the launch, I'm absolutely certain we'll move off Slack to this when the dedicated apps arrive, maybe even before.