Seal

Sealed digital envelopes of letters and passwords that open for your family if you go quiet

Mobile appfreeglobal

Seal is a free, open-source iOS app that seals letters and passwords, releasing them to chosen recipients only if the user goes inactive for a set period, acting as a digital dead man's switch. It has no backend server and uses hardware-backed security (Secure Enclave, security keys) and Shamir secret sharing to protect sealed content. It's for people who want a way to pass on important information to family if something happens to them.

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Behind the summary, Matchbox keeps a richer profile of Seal - the signals our matcher actually reads to decide when to surface it. It stays private; claim the listing to see and control it.

Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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