Compare software

Holos vs snac: catalog facts
Holos	snac
Free Free and open source under the AGPL-3.0 licence.	Free Free and open source.
Android	Linux, Self-hosted
Your device is your ActivityPub server End-to-end encrypted direct messages	Very small footprint in portable C Actively maintained with frequent releases
Relies on a relay to stay reachable while the device is offline New project, version 1.0.0 released in 2026	Minimal feature set compared with Mastodon Requires running your own server
Downloadable app	Self-hosted
Open source	Open source
License: AGPL-3.0-only	License not stated
Not stated if an account is needed	No account 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 September 23, 2026

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