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Might still be a good alternative to companies that want Slack, but cannot afford to pay for it? (Assuming they're not finding what they need in the free version.)

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Or that don't want third parties to have access to their internal communications.

This is an important point. It surprises me that many non-US companies use slack for their internal and secret communication.

We found Mattermost to be more expensive than a paid version of Slack for our team of 16 after factoring in the costs of hosting, maintaining, and securing our own servers. It shifts the engineering cost burden onto your team.

As others point out, Mattermost vs. Slack is more a discussion of self-hosted vs. 3rd party cloud-hosted.

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