Shum / decentralized messenger

Conversations
start nearby

A messenger with no phone number and no central server. Over Bluetooth nearby, even without a network, and over the internet at any distance.

Get Shum Getting started

One message. Two paths.

Alice

Bob

↔ BluetoothNearby, no internet

Nostr relaysOver the internet, any distance

Only the recipient can read the message.

IdentityA key on your device

ContactsQR code, link or meeting in person

SpecificationOpen protocol

All about Shum

Apps

Where Shum runs today and how to install it.

Open section 02

Docs

How to create a profile, find people and keep your keys safe.

Open section 03

Protocol

How keys, messages and delivery work. For anyone writing their own client.

Clients and versions

iOS	In App Store review	Mobile
Android	In development	Mobile
macOS	In development	Desktop
Windows	In development	Desktop
Linux	In development	Desktop
Browser	In development	Browser, internet only
CLI for macOS	Preview 0.1.8	CLI, via Homebrew or curl
CLI for Linux and Windows	In development	CLI

Security

Know who
you trust.

Messages are encrypted on your device, and relays only see sealed envelopes. We are also upfront about what Shum does not hide yet.