Show HN: No Trace Chat – secret code, no signup, messages disappear after read

No Trace Chat is a private messaging app we built for people who want to chat without leaving a trace: no account, no phone number, no discovery—just a secret code (or QR) you share with someone. Messages are E2E encrypted and disappear after the other person reads them.

How it works: you create or join a “room” with a 16+ character code (or scan a QR). Only people with that code can see the conversation. Keys are derived from the code on device; we never have the key. “Seen & delete” removes the message for everyone after it’s read.

We added optional privacy levels (e.g. don’t save codes on device), screenshot blocking by default, and no push notifications so usage stays as private as possible.

Android and iOS, freemium (free tier + one-time unlock). Would love feedback from anyone who cares about minimal-footprint messaging.

Landing: https://apps.teamzlab.com/no-trace-chat Android: https://play.google.com/store/apps/details?id=com.teamzlab.n... iOS: https://apps.apple.com/us/app/no-trace-chat-private/id675886...