You will always find problems associated with every thing but here’s some recommandations :

For a good start, Signal and his forks (molly…)

For daily basis and better than Signal, choose SimpleX (SimpleX is only feature incomplete for the mainstream app, but in it you can send texts, voices, photos, videos, live messages, have a PP, a alias for your contacts…)

Important stuff and activism, use Briar

Kind of limited due to there not being an iOS version, but Briar is pretty decent. It was made to be usable in repressive areas by press and other groups, as well as in areas where bad weather has taken out cell and regular wifi. Can be used with phone data, but also offline via ad-hoc wifi and bluetooth. But stuff like Signal and SimpleX are more overall useful to more people (and I think SimpleX also supports offline local immediate area of each other like wifi and bluetooth but I don’t remember atm).

If you really need it to be secure and private, and are communicating mostly with known acquaintances within a reasonable radius, with low bandwidth requirements, LoRA with encryption is the best bet.

It is a higher bar of entry but at least you can be confident your messages won’t be intercepted in any useful form.

Conversations for android is an example of a good XMPP client.

Just out of curiosity: why is nobody recommending Tox?

The German technology blog Kuketz has a comprehensive overview and comparison of all major messenger services.

Use Signal or Simplex.

Signal does require a phone number. However, as long as you understand what that means you are fine.

People say this over and over “depends on your threat model” and yet people seem to have a hard time understanding that. Your threat model is “who is your adversary and what he is willing/able to do”. Your security goal is what do you want to keep from your adversary.

As others said, if you are an activist or sth important, perhaps you might want to build a working knowledge of cryptography yourself. If you just want META not being able to see your NSFW chat with your romantic partner Signal might be more than enough. In fact, people way more relevant than me also suggest that Signal is good even for bounty hunter vulnerability reporting.

Having said that, what bugs me most is that people think the instant messaging format as suitable for everything: activism, jobs, crimes, broadcasting 1970’s prog rock for extraterestrials , whatever lmao. Do you really want to use your phone for all that? Like, just carrying the phone around in the first place nullifies your other precautions, for all advanced threat models beyond privacy of non-critical social messaging.

Persistent/resourceful adversaries can eventually get to you, using a set of penetration and intelligence techniques, which means, if you are involved, the convenience of messaging your partners in crime from the phone in your pocket while waiting for a bus is a convenience you probably can’t afford.

reasons not to use signal

Has this been updated in awhile?

Wire is the best for security (it literally won’t let you send messages unencrypted), cost (its free), privacy (no phone number required), and usability for the masses (Foss client on all the platforms, messages sync between each client like you’d expect)

I haven’t found anything that checks all those boxes other than Wire (though I do wish we had other options that came close)

https://Wire.com

https://tox.chat/

It has no central servers, is completely open source and all messages are E2E encrypted. It also has video calls and file sharing which are E2E encrypted as well.

There are a few that do a good job of protecting our messages with end-to-end encryption, but no single one fits all use cases beyond that, so we have to prioritize our needs.

Signal is pretty decent at meta-data protection (at the application level), but has a single point of failure/monitoring, requires linking a phone number to your account, can’t be self-hosted in any useful way, and is (practically speaking) bound to services run by privacy invaders like Google.

Matrix is decentralized, self-hostable, anonymous, and has good multi-device support, but hasn’t yet moved certain meta-data into the encrypted channel.

SimpleX makes it relatively easy to avoid revealing a single user ID to multiple contacts (queue IDs are user IDs despite the misleading marketing) and plans to implement multi-hop routing to protect meta-data better than Signal can (is this implemented yet?), but lacks multi-device support, drops messages if they’re not retrieved within 3 weeks, lacks group calls, and has an unclear future because it depends on venture capital to operate and to continue development.

I use Matrix because it has the features that I and my contacts expect, and can route around system failures, attacks, and government interference. This means it will still operate even if political and financial landscapes change, so I can count on at least some of my social network remaining intact for a long time to come, rather than having to ask everyone to adopt a new messenger again at some point. For my use case, these things are more important than hiding who is talking to whom, so it’s a tradeoff that makes sense for me. (Also, Matrix has acknowledged the meta-data problem and indicated that they want to fix it eventually.)

Some people have different use cases, though. Notably, whistleblowers and journalists whose safety might depend on hiding who they’re talking to should prioritize meta-data protection over things like multi-device support and long-term network resilience.

Conversations?

good messenger for what?

if you want a solution for you and a bunch of your henchmen to coordinate and discuss totally-not-crimes with ephemeral comms, practically any E2EE solution will work; once the not-crimen is done, burn your accounts and toss the devices for good measure and you’re scot free.

if you want a secure messenger that’s part of a widely used communication platform where you can also do normal people shit and also convert normal people to actually use it (think getting contact deets from cute boy/girl at a bar or giving yours to a business correspondent without an elaborate powerpoint presentation on how to use it) and you want to enjoy the fruits of 20+ years of continuous IM development, like having top-notch UX, battery efficiency, network resiliency, quality voice/video calls, etc., without being spied on then such a thing doesn’t exist.

how come? meredith baxter recently stated that it costs signal $50MM/yr to run their infra. that money has to come from somewhere. if there are no advertising dolts dumping cash on spying on your social graph and convos, the remaining avenues for financing are few and far between.

in closing, there aren’t any super awesome messengers you weren’t aware of, everything is shit.

The SimpleX battery drain issue does not affect everyone. At least for me, it has been perfectly fine.