They claim to have secure end-to-end encryption. In fact, I would say using wire.com is better than Signal because Signal does not make any guarantee of anonymity.
With the wire desktop app you can take steps to anonymize your connection to their server, although on a mobile device it's probably roughly equivalent to Signal.
Also, here is a handy chart that compares the differences between these two services (and other similar competitors). https://wire.com/privacy/
You're promoting Wire for anonymity? Check out their privacy policy, Wire maintains a server side copy of your entire contact list, all the groups that you're in, the plaintext metadata for your groups (membership, plaintext group title, plaintext group avatar), etc etc.
They have broken voice encryption, and leak enough data to reconstruct the audio of your calls. They leak tons of plaintext directly back to themselves, like GIF searches, and rolled their own messaging crypto that experts say is broken.
They have been caught lying about what kind of encryption they provide, they lied about being open source for years, they lied about being based in switzerland. From what I can tell, the only people promoting Wire after all that are usually on Wire's marketing team.
They did in another comment on this page. I do not see any evidence that worries me. Perhaps if you're a famous terrorist, you won't want to use it, because your GIF searches might expose your evil plans. But I only needed a way to talk to family and friends that was more private than Facebook and Google, while not sacrificing features and usability. I think Wire has done an excellent job. I've not found anything else that checks all the boxes.
Just wondering, but why not just use XMPP? You can choose any server that you like or trust, or run your own (on your own or third party infrastructure, up to you), and use OTR for end-to-end encryption if you feel you need to¹.
I have been using XMPP since 2000/2001. My current address is nine years old (and I control the server). I have a choice of clients on every platform that I use. All my contacts have the same set of choices regarding provider, accounts, and clients. As a bonus, not just my human contacts but also my infrastructure uses it for messaging and monitoring, so I can literally control some of my servers from my XMPP clients.
There must have been at least thirty major IM "solutions" going in and out of fashion during these 16 years. Individually, each might have been somehow "more convenient", but if start counting the cumulative migration effort, I'm not sure the convenience argument holds much water.
¹ I used it in anger once myself, initiated by one of my contacts. It was an interesting experience.
For one thing, XMPP does not have the same features. Try Wire and see for yourself. There's audio, video, voice messages, multiple device encryption. Maybe XMPP has improved, but it didn't work as well for mobile use.
> Is OTR really a practical option? You message seems unclear about it.
It depends on your threat model, like other alternatives.
I have never initiated an OTR session myself, but I have received one from a contact in anger (whistleblowing).
> Also, how do you get all your contacts to use XMPP
In my case, I have been using XMPP for the last sixteen years, so my contacts have "grown organically", to use an en vogue marketing term.
It appears that Mac computers come with an XMPP client preinstalled (and possibly pre-configured?) Linux, the same. Android, there are a number of clients available. Windows, I think there is Gajim, ...
As far as a stereotypical common user is concerned, they are quite happy to install whatever applications their peers are using, which is how they end up with so much cruft on their computers, phones, etc. :-)
> and your server?
Nobody needs to use my server. It is like email, you can use whichever provider you like.
With the wire desktop app you can take steps to anonymize your connection to their server, although on a mobile device it's probably roughly equivalent to Signal.
Also, here is a handy chart that compares the differences between these two services (and other similar competitors). https://wire.com/privacy/