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You pair once with someone you trust (scan each other's QR code in person, or send a one-time invite link). Then, during any call, video, or chat, you both open the app and tap Verify Now — both phones show the same short code (two words and four digits). Read it aloud; a match proves you're really talking to their paired device with a live person behind it.

No. Countersign.me never has access to your calls, video, or messages. It runs alongside whatever app you're already using and only handles the verification itself.

You get an immediate alarm advising you to hang up and reach the person another way. A mismatch is exactly the warning you want — it means the device or person on the other end isn't who they claim to be.

That contact was paired remotely (via an invite link) rather than in person, so it's trusted on a first-use basis. Upgrade it to full trust by scanning each other's QR code in person, or by comparing a verification code over a channel you both already trust.

Make sure notifications are enabled for Countersign.me in your phone's Settings, and that you're online. The app also polls as a fallback, so requests still arrive even if a notification is missed.

Your identity key lives in your phone's secure hardware and can't be moved, so a new phone means re-pairing with your contacts. That's deliberate — a changed key is treated as untrusted until you re-pair, the same way Signal handles safety-number changes.

The free plan includes up to 3 paired contacts. The one-time "Unlimited" purchase lets you add as many contacts as you like. Responding to verifications and accepting invites is always free for everyone. Purchases restore on any device signed into your Apple ID.

Almost nothing — no accounts, no contact list, no message content, just a sealed, unreadable message queue that clears within minutes. See our Privacy Policy for the full detail.