Google PlayWeek 1
Planning and design
First, we planned the structure, the user flows and an interface that stays simple despite the security underneath.
WhisFai — A privacy-focused messaging app for people you have met
Mobile app · Privacy
WhisFai is a privacy-focused messaging app for Android and iPhone. It encrypts every message on your phone before it leaves. You add friends by meeting them in person, and you never need a phone number. We built the first version in one month.
The problem
A messenger that knows less about you.
Most messaging apps start with your phone number and a public directory. So anyone can find you, and the server knows more than it needs to. WhisFai had to work the other way around.
Your number is the key
Signing up with a phone number means strangers, spam and data brokers can reach you.
Nearby, but not findable
Two people in the same room still had to type usernames to connect, and they often typed them wrong.
Who am I really talking to?
Without a way to verify a contact in person, an account can be anyone.
Calls and files elsewhere
Private chats, calls and file sharing lived in different apps, so privacy ended at the chat window.
What we built
A privacy-focused messaging app where trust starts in person.
We built a privacy-focused messaging app where trust starts in person. Two people meet and find each other over Bluetooth. Then they scan each other's code, and both phones show the same 60-digit safety number. From then on, the phones seal every message between them.
Encrypted on your device
The phone encrypts every one-to-one message before it leaves, each with its own key. Our servers only ever see ciphertext.
Found over Bluetooth
People in the same room find each other over Bluetooth, so nobody types a username by mistake.
Verified by a shared number
Both people scan a code, and both phones then show the same 60-digit safety number. No key travels over Bluetooth or inside the code.
Calls, groups and a vault
Voice and video calls over encrypted connections, group chats and a Contact Vault, all inside the same private messenger.
How it came together
One month, from plan to store release.
We planned the flows in week one and built messaging and discovery in week two. Then we added verification and calls, and finally tested until release.
Week 2
Messaging and discovery
Core messaging, accounts without phone numbers, and Bluetooth discovery of people nearby.
Week 3
Verification and calls
QR verification with the shared safety number, then voice and video calls through the encrypted call servers.
Week 4
Testing and release
Finally, we tested every flow on both platforms and shipped the app to Google Play and the App Store.
The result
Private by design, live in both stores.
The WhisFai app is live on Google Play and the App Store, and the same account also opens WhisFai Meet in the browser. The app encrypts every one-to-one message on the device with an open-source Olm session, so the servers only ever store ciphertext. A username and a password are enough to start.
KTKamal TizfaiCEO & Founder
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