instant messaging for professionals

What is zipper?

instant messaging

zipper is a modern instant messaging system, similar to WhatsApp® in usability, but mainly conceived for the desktop and not strictly mobile-based. It offers text messaging, file transfer, and high-quality voice and video communication. It is browser-based, so there is no need for users to install any software or driver on the desktop, and it works on any operating system. The mobile apps will soon be available in the Android® and Apple® app stores.


zipper is the first instant messaging system to offer certified mail (or registered letters) for the digital age. We are leveraging the blockchain technology for storing cryptographic reception receipts. Proof-of-reception is ensured by users applying their digital signature using a YubiKey®, a cryptographic USB key used for secure user authentication by Google®, Dropbox®, Facebook®, Apple®, Microsoft® and others.


Link your zipper account with your preferred cloud storage provider, so that all documents received through zipper get automatically uploaded to your storage account. This is a simple solution for backing up and conveniently accessing, searching and managing documents. We currently support Dropbox®, but plan to support other major storage providers such as Google Drive®, Microsoft OneDrive®, as well as Switzerland-based providers.


zipper uses end-to-end encryption (double ratchet algorithm based on the Signal protocol) for all text messaging traffic, file transfer, voice calling and video calling. The encryption keys stay on the users devices, and are not saved on the zipper servers; the keys can be easily backed-up by users within the application if needed, for example when re-installing a computer’s operating system. The zipper servers for front and back-end are hosted in Switzerland.

About us

Join us in making business communication more direct, more secure, and more convenient.

zipper Instant Messaging is a startup from Switzerland aiming to challenge the current business communication model.

Our goal is to offer a cutting-edge alternative to paper and email: An instant messaging system focused on security and convenience. With zipper, complex technologies such as authentication, encryption, and digital signature, are proposed in their easiest and friendliest forms to users.

Our prototype is ready for testing. Simply create a new account, get a friend or colleague to do the same and start chatting, exchanging documents, and making audio/video calls. You will need a Yubikey to test blockchain-certified documents and digital signatures.


jean-françois alarie

Electrical engineer / MBA, worked in aerospace and later in banking. Has the startup bug and is committed to make this venture fly!

dr. bernhard distl

PhD from ETH Zurich, cyber-security and cryptography expert, world traveler.

dr. daniela brauckhoff

Security Advisor
PhD in network security from ETH Zurich. Expert on all matters related to cybersecurity. Kick-ass product manager.

lucas betschart

Blockchain Advisor
Co-founder Blockchain Source. President Bitcoin Association Switzerland.

latest news

contact us

...and follow us on Twitter (@zipperIM)