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