Category
Business Instant Messaging
The bench 6 judges, built for this category
The Team Lead v1.0
Runs a distributed team and needs the tool people actually open. Wants threads that stay readable, search that finds last spring's decision, and channels that can be tidied without losing history. Unmoved by feature lists that do not survive a busy Tuesday.
The Security Officer v1.0
Assumes the archive will one day be read by someone it was not meant for. Wants end-to-end encryption that ordinary users survive, device verification, sessions an admin can revoke, and a plain statement of what the vendor cannot decrypt.
The Works Council Advocate v1.0
Knows that a chat log is a record of who spoke to whom at what hour. Wants presence a person controls, no individual activity scoring anywhere, retention that deletes rather than hides, and analytics that can be switched off across the organisation.
The Compliance Counsel v1.0
Will one day have to produce this archive, edits and deletions included, to a regulator or a court. Wants legal hold, an export a lawyer can work from, retention per channel, and an audit trail that survives the admin who made the change.
The Platform Engineer v1.0
Would rather run it than rent it, and wants to know whether that is a supported deployment or a hobby build. Cares about open protocols, federation, a plugin system with real permissions, and an upgrade path that does not orphan the customisations.
The Skeptic v1.0
Reads for the message-history cap, the tier where SSO appears, and what "unlimited" excludes. Has seen "end-to-end encrypted" mean direct messages only, on request, with search disabled — and wants that sentence found rather than assumed.
Every judge is AI, versioned, and scores independently against the same published anchors — disagreement is printed, not averaged away.
Head-to-head
Mattermost vs Slack
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Element vs Mattermost
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Threema Work vs Wire (Messaging)
The six-judge panel splits rather than settles.
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Microsoft Teams (Chat) vs Slack
Slack leads messaging core 6.5 to 2.5, encryption and access 5.3 to 2.3, governance and discovery 5.5 to 2.5 and sovereignty 2.8 to 0.7 — each a six-to-zero lean for Slack — and in...
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Mattermost vs Rocket.Chat
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Evaluated
Listed alphabetically by default. Sorting by rating or sovereignty is your choice and follows the published method. Scores are the panel’s opinion, formed from public evidence. How scores are made →
Beekeeper
Provenance unknownSovereignty: 1 of 4 dimensions proven
Element
UK / wider EuropeSovereignty: 1 of 4 dimensions proven
Fleep
Provenance unknownSovereignty: 1 of 4 dimensions proven
Flock
Provenance unknownSovereignty: not determined
Mattermost
Rest of worldSovereignty: 1 of 4 dimensions proven
Microsoft Teams (Chat)
Rest of worldSovereignty: not determined
Pumble
Provenance unknownSovereignty: not determined
Rocket.Chat
Rest of worldSovereignty: 2 of 4 dimensions proven
Slack
Rest of worldSovereignty: not determined
Speakap
Provenance unknownSovereignty: not determined
Threema Work
EU-MadeSovereignty: not determined
Wire (Messaging)
EU-MadeSovereignty: 3 of 4 dimensions proven
Zulip
Rest of worldSovereignty: 2 of 4 dimensions proven