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Mastodon vs Holos: catalog facts
Mastodon	Holos
Free Free and open source under the AGPL. Hosting is separate.	Free Free and open source under the AGPL-3.0 licence.
Android, Web, Self-hosted	Android
Chronological timelines with no engagement ranking Federated, so moving servers does not mean losing your network	Your device is your ActivityPub server End-to-end encrypted direct messages
Your experience depends heavily on which server you join Running a server has real moderation and maintenance cost	Relies on a relay to stay reachable while the device is offline New project, version 1.0.0 released in 2026
Self-hosted, Web application	Downloadable app
Open source	Open source
License: AGPL-3.0	License: AGPL-3.0-only
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.