Why Zitrone?

Long before modern encryption, people trusted lemons to hide their words.

For centuries, lemon juice was one of the most trusted ways to hide a message. Write with it, let it dry, and the page looks blank. Hold it to heat, and the words rise up out of nothing. Spies used it for generations — a message hiding in plain sight, invisible until the right person knew to look.

We loved that history.

Because a lemon has always been two things at once: an ordinary fruit sitting on a kitchen counter, and a tool capable of hiding a secret in plain sight.

A lemon also protects what's inside.

Beneath the rind is the pith. Beneath the pith are the segments. Layer by layer, everything at its center is protected. Nothing is exposed by accident.

That's not a bad way to describe how Zitrone is built.

Layer after layer, each designed with the assumption that another layer could someday fail. End-to-end encryption. Secure key exchange. Ephemeral messages. Optional privacy networks. Defense in depth. Every layer exists for one reason:

To protect what you said.

And who you said it to.

We're not interested in the black hoodies, skull logos, and bunker aesthetics that privacy software often embraces. Surveillance is serious enough. We don't believe defending yourself has to look intimidating.

Privacy should feel normal.

Fresh.

Bright.

Privacy, with zest. 🍋