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Hollo vs Holos: catalog facts
Hollo	Holos
Free Free to self-host from the GitHub repository.	Free Free and open source under the AGPL-3.0 licence.
Self-hosted	Android
Federates with Mastodon and the wider fediverse Works with existing Mastodon client apps	Your device is your ActivityPub server End-to-end encrypted direct messages
Single-user only You must run and maintain the server yourself	Relies on a relay to stay reachable while the device is offline New project, version 1.0.0 released in 2026
Self-hosted	Downloadable app
Closed source	Open source
License not stated	License: AGPL-3.0-only
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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