The cryptography is sound, however, it's also frequently changing, in addition to straying from standards more or less. This makes it difficult to give a firm answer.
This ETH (i.e. Zurich) paper[0] identified several exploitable vulnerabilities (bad), which were quickly addressed by delta chat (good).
So overall, I'd see it as a good messenger, but with downsides.
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The cryptography is sound, however, it's also frequently changing, in addition to straying from standards more or less. This makes it difficult to give a firm answer.
This ETH (i.e. Zurich) paper[0] identified several exploitable vulnerabilities (bad), which were quickly addressed by delta chat (good).
So overall, I'd see it as a good messenger, but with downsides.
[0]: https://www.usenix.org/system/files/usenixsecurity24-song-yu...