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Holos vs Ktistec: catalog facts
Holos	Ktistec
Free Free and open source under the AGPL-3.0 licence.	Free Free to download and run on your own server.
Android	Web, Self-hosted
Your device is your ActivityPub server End-to-end encrypted direct messages	Built for single users and small groups Federates with Mastodon and other ActivityPub software
Relies on a relay to stay reachable while the device is offline New project, version 1.0.0 released in 2026	Not designed for large public communities Requires running and maintaining your own server
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.