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

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