Because your conversations deserve access control — and an emergency exit.

Altnine gives you the choice to protect your app with a PIN-based lock. Once enabled, you'll need to enter your chosen PIN each time you open the app. It's a simple way to add a layer of control over your private messages.

But we didn’t stop there. We also introduced something unique: the Flush PIN.

This special PIN works like a normal app lock — but with a twist. If you ever unlock your app using the Flush PIN, it will instantly wipe all local data on your device. Chats, messages, and stored info vanish, and the app opens as if freshly installed.

It’s the perfect feature for emergency privacy — a fast, silent way to clear everything without needing to explain.

And as for biometrics? We don’t reinvent the wheel. iOS and Android already offer system-level biometric authentication, so we focus on what matters most: giving you PIN-based control that’s there when you need it.