Pumble is a work chat app designed specifically to be a direct "clone" of Slack, with a very similar look and feel.
How it compares to Slack
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Familiar interface: There is virtually no learning curve for teams who are already used to Slack's interface.
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Generous free plan: It directly solves Slack's biggest free plan problem by offering unlimited message history.
Keep in mind
By copying Slack, Pumble also inherits the potential for a noisy, distracting environment.
As a follower, not an innovator, it lacks the polish, stability, and robust library of integrations that more established platforms offer.
The user experience
Pumble’s user experience feels much like using Slack.
This means it’s familiar for Slack users, but it also means it has the same issues of a noisy, fast-paced, and notification-heavy environment that can be distracting.
Bottom line
A practical option if your only goal is to find a free tool that looks like Slack, but it's not a strategic choice for a business looking for a truly better, easier, or more innovative tool.