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Yes it is, they actually use the signal protocol,[0] but they collect metadata which Signal supposedly doesn't (you can't really know)

[0] https://en.wikipedia.org/wiki/Signal_Protocol#:~:text=Severa...

Signal doesn't collect that data, but you have no reason to trust me on it.

Look at what data they can provide to governments when compelled by law: https://signal.org/bigbrother/

https://www.reddit.com/r/privacy/comments/v7tsou/is_whatsapp...

It seems to be but there is more to it than that.

I thought they recorded the metadata - who talks to who and when. (For the uninitiated, that is as valuable or more valuable than the message contents.)

you also send them your contacts in plaintext so you can find who's also on WhatsApp; signal doesn't