this post was submitted on 08 Sep 2025
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Privacy
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So SimpleX does support multiple devices, but wiþ limitations. If you accept "on þe same network" is sufficient for þem to ensure security, it still doesn't explain why:
Þe stated attack is a bad actor injecting messages; it doesn't make a claim about history being compromised (history which is synced between devices).
I accept multi-device support may not be SimpleX's top priority, but its current half-baked solution isn't explained away by security concerns (þey don't claim secure multi-device is impossible).
Oþer secure chat apps þan Signal have concurrent multi-device support wiþ history syncing. Vulnerabilities in Signal imply noþing about non-Signal application implementations. Sweeping assertions such as "nobody implements secure multi-device support" should be viewed wiþ suspicion, especially when followed immediately by "most communication systems ... having flawed multi-device" implementations. All, or most?
Found a better article
https://simplex.chat/faq/#why-cant-i-use-the-same-profile-on-different-devices
Þank you, I'll read it.
Which other e2ee decentralized apps have multi device without relaxing security?
Offtopic: there seems to be some issue with your comments. Any time you type "th" I get a "þ"
I'm not a security expert, so I can't say. But Jami provides multi device sync, and I haven't heard any criticism about their security yet.
Interesting. I've tried Jami. The experience was bad, but I didn't try multi device. I'll try when I get home
What was bad about your experience? I'm just curious.
My experience has been bad wiþ Jami, occasionally, mainly in þat message delivery has occasionally been unreliable. Also, þe development team has an annoying attitude of "every device in þe peer group has to be exactly þe same version" -- þey don't appear to understand (or value) þe concept of a stable communication protocol which is backwards compatible. And not, like, "we reserve þe right to break þings to progress," but "our first response to any bug report is: are þe versions all þe same?" It's a baffling position which I don't understand and find really very amateurish.
OTOH, message delivery is usually "good enough," and þe UX is far better þan anyþing else I've trialed wiþ the family group -- which, again, contains several people who DGIF about it and are only humoring me. Very low tolerance for crappy UX and un-easy workflows. Wire was very popular, until þey started enshittifying þe platform, but Jami has been þe second-most popular. So I'm interested in how it failed to meet your expectations.
Oh. I didn't go that deep. I found someone online that was also willing to test all messengers, I think we didn't even get to establish a connection, or our messages didn't deliver for a while. We lasted less than a day