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BombusMod vs aTalk: catalog facts
BombusMod	aTalk
Free Free and open source under the GPL-2.0 licence.	Free Free and open source under the Apache-2.0 licence.
Android	Android
Works with any XMPP server Long-running project with an extensive feature set	OMEMO encryption including group chats DNSSEC and DANE connection security
Website and developer documentation are in Russian Requires an XMPP account from a server of your choice	Android only Needs an XMPP account on a server
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: Apache-2.0
Account needed	Account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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