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

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