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Posted by no_creativity_ 1/19/2026

A decentralized peer-to-peer messaging application that operates over Bluetooth(bitchat.free)
636 points | 339 commentspage 3
JulianHart 1/19/2026|
This would've been useful during the Iran shutdowns last week. Bluetooth mesh is one of the few things that keeps working when carriers go dark.
dominicrose 1/19/2026|
The regime in Iran has so much to hide it's unlikely that they will enable unsupervised international communication ever again. Other countries don't seem ready to do anything about it.
Kapura 1/19/2026||
choosing to build an application on top of bluetooth is like saying, "we've constructed a highway over the most stable terrain known to man: volcanic marshes prone to seasonal flooding."

how do you know when the messaging app is broken, and how do you know when bluetooth is just exercising its ability to hate mankind?

coffeebeqn 1/19/2026||
What else would they use? This is for when your government has turned off all sensible networks.
fnands 1/19/2026||
Funny, but I think you're missing the point here.

This is not meant to be an efficient, every day messaging platform.

It's for people who are afraid of the government turning off the internet/cell network (kinda justified if you live in Iran or Uganda), or those networks going offline due to natural disasters (see Jamaica)

brk 1/19/2026||
It's a neat concept, but in critical scenarios where you are trying to distribute information because traditional wireless methods are down, methods like this can make it easy for users to be targeted via RF transmissions.

Hard to imagine things like this getting much beyond the "cute" stage.

rm30 1/19/2026||
The project is interesting, the concept too, the idea of indipendent communication tools also.

I'll tell you a story.

Usain Bolt, the world 100/200m recordman, is not faster than cheeta. He needs a motorbike or a car to be beat a cheeta. But even with a car or motorbike is unlikely is going to overtak a cheeta on the ground of savannah.

This to tell you are thinking about optimizations of a system while you need to choose the right system for the environment.

A 433 MHz based link and a strong modulation is much suitable solution than a BT class 2 device included in the phone.

And here the real hack, most of phones has an integrated FM receiver, higher sensibility than BT, a simple FM transmitter (88-108 MHz) and problem solved.

deknos 1/19/2026|
but for that to work, you need to attach an antenna, no? and where do i get such an FM transmitter? AND android does not support it in the software level, and there's no protocol for the waves?
rm30 1/19/2026||
To have an FM receiver work on a phone, you do need an antenna, the wired headphones serve that purpose perfectly. An FM transmitter is easy to find; you can use the simple 'Jack-to-FM' adapters designed for car radios, or much better, a USB SDR (which can range from a few kHz to GHz).

Regarding the 'protocol for the waves,' you'll need to play with modulation. That’s the fun part. In technical literature, there are many well-defined modulations (like AFSK or FSK) with clear suggested applications for low-SNR environments.

As for Android support, I have no idea. I understand that in this thread, 'free' sounds like 'freedom,' but freedom has a cost. The freedom of communication requires investment: in hardware, software, and the time to learn the physics of the environment.

deknos 1/19/2026||
hm, than i think it's better to use the LORA stuff, no? if i need an external device with my device anyway, i can use one of them.

because the fun thing is cool, but people want some usable...

rm30 1/19/2026||
It depends on which step of the staircase, from pure hardware to pure software, you want to position yourself. Some projects require staying closer to the metal, while others can be purely software. I move up and down this staircase depending on the specific requirements.

If the requirement is to communicate where consumer standards like Bluetooth fail, like in a ship, you have to choose the system for the environment. I evaluate these choices like an architect building a robust system, rather than just using what is available at the nearby shop.

bilsbie 1/19/2026||
I open bitchat once a week. Someday I’ll find someone nearby and we’ll be best friends.
anidsiam 1/19/2026||
Jack Dorsey is definitely a smart guy, I believe there is a big reason behind it. I wish he will surprise us to make it capable global communication. But my question is how long it will take to work it for a long distance?
Kina 1/19/2026|
I think he’s just a guy who got a lot of money who can pay people to implement his sometimes weird, sometimes useful, often ill-conceived obsession with decentralization and a very lame version of “freedom”.

Like, he quit BlueSky because he wanted it to be completely unmoderated which is, frankly, asinine. His view of what “censorship” means exists in a world along with spherical cows and no bad actors.

russnes 1/19/2026||
Why are these apps on bluetooth? I'm surprised no one has come up with a way to transmit data over local ad hoc wifi networks, it must surely be more simple if you could make some sort of transient hot spot
erlend_sh 1/19/2026|
Bluetooth works most reliably across all devices (within its limited range), but all these p2p apps are indeed moving towards multi-transport support to diversify and widen the connectivity grid: https://hackmd.io/@grjte/bitchat-wifi-aware
h4kunamata 1/19/2026||
Reading some comments, people do not understand.....

Anything that does not involve having govs and the middle man, will never be allowed, legally.

Long frequency radios, phone-to-phone communication, decentralized payment systems, anything. If the gov cannot track you or cannot make you pay tax for it, it will never become popular for obvious reasons.

It is legal in 2026 for Sony and others to delete digital content you bought and paid tax for because it doesn't belong to you, yet, it is illegal to download such content via torrent. That tells you a lot.

StephenMelon 1/19/2026||
The problem with the App Store model is that the app could just be switched off by the powers that be. It would be better if something like this could be built into the OS. If one decentralised use case took off, then there could be other applications, like hosting the internet archive, wikipedia or LLMs, or digital cash. Might need waystations to get into rural areas but it sounds like the best long term way to secure the free internet.
Angostura 1/19/2026|
I work at a hospital. I think this could be a really interesting emergency fallback system in the event that there is catastrophic failure of mobile, bleep and WiFi
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