Smithy is described as 'App for Slack that allows channels to be designated as threads-only, making threads mandatory and surfacing decisions taken in discussions' and is a Group Chat app in the office & productivity category. There are 2 alternatives to Smithy for a variety of platforms, including Mac, Windows, Linux, Web-based and Android apps. The best Smithy alternative is Zulip. It's not free, so if you're looking for a free alternative, you could try Zulip or Twist.
Zulip is the only modern team chat app that is designed for both live and asynchronous conversations. Zulip topics create a separate space for each discussion, so different conversations will never get in each other's way.
Twist is a team communication service that emphasizes conversation organization and work relevance. It does so in a way that promotes asynchronous communication for more thoughtful discourse.
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