Straight to them
If the person you're messaging is within Bluetooth range, the message goes directly to their phone. Nothing else is involved.
Works with zero bars
Messaging that doesn't
need the internet.
byte-chat passes your messages phone to phone over Bluetooth, hopping through nearby devices until they arrive. No servers. No phone number. No account. When there is internet, it quietly uses that too.
- No SIM
- No signup
- No servers
- End-to-end encrypted
How it works
Your message takes whatever road is open.
Three paths, one app. You never have to choose — byte-chat picks, and tells you honestly which one it used.
Through the crowd
Out of range? Other byte-chat phones relay it forward, hop by hop, until it reaches them. Relays can't read a thing — it's sealed end to end.
Over the internet
For people you've both marked as favorites, byte-chat can also deliver across the world over public relays — still encrypted, still no account.
What's inside
A normal messenger. Unusual plumbing.
Everything you'd expect from a chat app, built on infrastructure that keeps working when the towers don't.
Sealed end to end
Every private message is encrypted with the Noise protocol before it leaves your phone. Relays carry ciphertext they can't open.
Nobody to hand over
There is no company account, no address book upload, no phone number, and no server holding your messages. There's nothing to subpoena.
Rooms by place
Drop into an open channel scoped to your block, neighborhood, or city. Great for events, campuses and neighborhoods — no invite links.
Voice, photos, files
Hold to record a voice note. Send images and documents. They queue and re-send themselves when a path opens up.
Verify a person, once
Scan a friend's code in person and they're verified forever — a seal on their name. No key ceremonies, no jargon.
Panic wipe
One deliberate gesture clears every message, key and trace from the device. Instant, local, irreversible.
Honest delivery
We never fake a checkmark.
Most messengers show you two ticks and hope. On a mesh, the truth is more interesting — and more useful. byte-chat shows you exactly where your message actually is, in plain words.
Try it- ◷SendingOn your phone, looking for a way out.
- ✓Sent into the meshIt's on the air. Nobody has confirmed yet.
- ✓✓DeliveredTheir phone confirmed receipt.
- ✓✓ReadThey opened it.
- ◷QueuedNo path right now. It'll go the moment there is one.
Where it earns its keep
The places your bars go to die.
Festivals & stadiumsSixty thousand phones, one cell tower. Bluetooth doesn't care.
Flights & subwaysAirplane mode with Bluetooth on is a working network.
Outages & stormsWhen the grid is down, the phones in your building still aren't.
Trails & backcountryKeep the group talking well past the last bar of signal.
Campuses & conferencesLocal channels for the people actually in the room.
Travelling without dataNo roaming plan, no local SIM, still reachable.
Put a network in your pocket.
byte-chat is in active development. Builds are available for iOS and Android — grab one, or watch the repo.
Open source · public domain · no telemetry, ever.
Questions
The obvious ones.
Does this really work with no internet at all?
Yes. Bluetooth Low Energy is the transport. Two phones in range talk directly; further away, other byte-chat phones pass the message along. No Wi-Fi, no cell, no server anywhere in that path.
How far does it reach?
A single Bluetooth hop is roughly 30–100 metres depending on phones and walls. Range compounds with every relaying phone in between, so a dense crowd stretches much further than any one device could.
Can the phones in between read my messages?
No. Private messages are encrypted end to end. A relaying phone sees an opaque blob it can't decrypt, and it can't tell what's inside or who ultimately wrote it.
Do I need a phone number or an account?
Neither. You pick a display name on first launch. Your identity is a cryptographic key generated on the device — nothing is registered anywhere, and nothing is uploaded.
What does it do to my battery?
Bluetooth Low Energy is designed for exactly this and the impact is modest. Relaying for others costs more, so at big events it helps to keep the app open and the phone charged.
Is it a replacement for WhatsApp?
It's the app you're glad to have when WhatsApp can't send. Everyday reach still depends on who's nearby or who you've favorited — but in the moments that matter, it's the one that works.