- Delta Chat 2.48+ releases minimize metadata exposure to servers via full header protection.
- Outer Date header is randomized to prevent timestamp correlation attacks.
- SecureJoin v3 hides cryptographic identities and ensures forward/backward compatibility.
- OpenPGP anonymous recipients are enabled, requiring upgraded clients for decryption.
- Chatmail profiles use random addresses without personal data collection.
- Audio/video calls now run in background like native calls using WebRTC.
- Support for alternative mobile ecosystems like DeltaTouch on Lomiri platforms.
- End-to-end encrypted group descriptions sync with member additions.
- Audio messages can be played in background on Desktop and Android.
- Reimplemented 'download on demand' to handle zero-metadata, splitting messages into small/large parts.
- Multi-path message delivery uses multiple relays for resilience against blockages or failures.
- Delta Chat aims for usability and privacy, contrasting with centralized services like Telegram.