New in 0.6: post-quantum chats, linked devices, profile photos and files up to 50 MB Encrypted messaging

A private messenger without the catch.

Your identity is three words, made on your phone and known to nobody else.

No phone numberNo emailNo account

Android, Windows, Linux. Free and open source, GPL-3.0.

9:41···
Marina
wren·velvet·march
Verified
3
Vouches
2y
Chatting
Keys verified in person · Apr 2
can't sleep. the rain is loud here
sunny and loud here
Message
01 · The problem

Every private messenger asks for something.

Encryption is the easy part. Privacy leaks through what gets collected around it.

The usual catch

Your phone number

In most countries it is tied to your ID.

The usual catch

Your address book

That hands over who you know, and who they know.

The usual catch

Push notifications

Google learns who messages you, and when.

Kryfo

None of them

No number, no contacts upload, no push service or directory unless you opt in. Nothing is collected.

02 · How it works

Serious cryptography, explained in plain words.

The Signal Protocol, Tor and Nostr relays, and an app that says what it does in plain words.

Three words

Your name is made on your phone.

Nothing is registered. Three words nobody can trace to you and a face you pick: that is the whole account.

9:4102 / 07
This is you

Made on this phone. Nothing is sent anywhere.

wren·velvet·march
Nobody can look this up. You share it, or you don't.
Continue
You choose the route

It tells you what each route costs.

Slower and hidden from everyone, or faster and seen by a relay. You pick.

9:4104 / 07
How your messages travel.

You can change this any time.

DEFAULT
Private
Slower to start. Your address stays hidden from everyone, including us.
IP HIDDEN both sides
Fast
Quicker. Our relay sees when you connect.
IP HIDDEN from contacts
Continue →
No strangers

Nobody reaches you unless you let them.

No one finds you unless you pick a public @name. People reach you through a code, a link, or an introduction.

9:41Requests
Sarah
Wants to connect
Introduced by Tom
Nadia
Wants to connect
Tom
Wants to connect
Name matches your contact Tom
Rooms that end

Some conversations should disappear.

A burner room expires and takes everything with it, on every phone in it.

9:41burns in 18h
This room and everything in it disappears in 18 hours
did the scans come through?
all of them. thanks
good. see you thursday
Screenshots don't work in here
03 · A look inside

The app, as it is.

Real screens from Kryfo 0.6.0, on a test phone with made-up names.

Your chats
Animated stickers
Advanced protection
Hidden chats
A chat with Marios
Polls in groups
The first start
Speed & privacy
04 · Useful alone

Useful before anyone else joins.

They need nobody else and no internet, and everything stays on your phone.

What a photo gives away

See what a photo says about you.

See where a photo or video was taken, on what phone and when. Then get a clean copy that looks the same.

9:41Tools
Photo cleaner

Read on this phone. The photo went nowhere.

Near Neukölln, Berlin · accurate to about 5 metres
Samsung Galaxy A12
The phone that took it
Sunday 14 September, 18:42
To the second
23 more fields
Lens, software, orientation
Remove all of it
Tool

Private QR codes

Wi-Fi, links, contacts and text, made on your phone. No website sees your password.

Tool

Lock a file with a password

It opens in Kryfo, or on any computer with the free tool age.

05 · The other side

What it isn't.

It hasn't been audited yet

No outside firm has reviewed Kryfo yet. Its building blocks are well studied, the way Kryfo combines them is not.

Goal €15,470Help fund the audit

It is early

It works and is used every day, but it is young and changes between releases.

06 · Get it

Free, open, and nothing to sign up for.

Only install Kryfo from Google Play, F-Droid, GitHub or kryfo.app. Copies on other sites are not ours, even when they look the same: where to get Kryfo.

Check what you installed

Every package we sign carries this key. Check yours before you trust it.

SHA-256 signing fingerprint 10:92:8A:61:64:2C:5C:C4:71:A9:98:69:E2:EA:4E:2D:4D:70:02:6E:79:7D:FB:A4:8C:0F:30:6B:5B:34:73:DB

How to check a download, and how F-Droid builds Kryfo: kryfo.app/download.