1
Element Free Open Source

Decentralized, end-to-end encrypted messaging built on the Matrix protocol.

Free Privacy-focused teams and cross-organization communication
End-to-End Encryption Matrix Protocol Bridges Self-Hosted
2

Slack feature for connecting channels between different organizations securely.

Paid from $7.25/user/mo Organizations needing secure inter-company messaging
Cross-Org Channels Security DMs Workflows
3
Chanty Free tier

Simple team messaging with tasks, video calls, and unlimited message history on the free plan.

Free for up to 5 members · Free Small teams wanting simple, affordable team chat
Unlimited History Tasks Video Calls Threads
4
Flock Free tier

Team messaging with built-in to-dos, polls, notes, and file sharing.

Free for up to 20 users · Free Teams wanting messaging with built-in productivity tools
To-Dos Polls Notes Video Calls

Quick comparison: Zulip vs Element

Feature Zulip Element
Starting price Free Free

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