Show HN: Seal – Letters and passwords that open for your family after you die

Seal is an iOS app that allows users to create encrypted digital envelopes containing letters, passwords, and secrets for family members to access after death. The app uses cryptographic keys distributed among trusted people that can only unlock the envelopes after the user's death, with no central server or company access to the encrypted contents. It's currently in TestFlight and scheduled for App Store submission in September 2026 as a one-time purchase with no subscription required.