Your details stay on your phone.

Tilde has no account, no internet and no tracking. This is what it stores, where, and when anything leaves your phone.

what the app can do

Tilde asks for two permissions: NFC and vibration. It has no internet permission, so it can’t send anything anywhere.
No analytics, no ads, no accounts and no tracking. The app writes no logs of your details.

Your cards, their photos and your Met list are stored only on your phone. Tilde opts out of Android’s cloud backup.
A backup is a file saved wherever you choose. It isn’t encrypted, so keep it somewhere private. The Guest Wi-Fi password is only included if you tick it.
Delete all data (Settings → About) removes everything from the phone, as uninstalling Tilde would.

Nothing leaves your phone until you share it: when you tap phones, when someone scans your code, or when you use Send.
A contact card you Send includes your photo only if you switch on Include your photo when you send your contact card (Settings → Sharing). It’s off by default, and a tap or the code never includes it.
By default, Tilde only answers taps while it’s on screen. Answer taps when Tilde is closed (off by default) lets it answer while the phone is unlocked. Taps are never answered from the lock screen.
Guest Wi-Fi: the password is stored only on your phone, but the Wi-Fi code contains it. Anyone who scans it, or taps your phone while you share it, can join your network.

The code is open source under the MIT license, so anyone can read what the app does: source on GitHub.
Every release is built from the public code and signed with the same key.

~ Tilde is free and open source.