Text, audio, and photos — encrypted and locked until your date.
ERP Mobiles · Capsule
A letter to your future self.
In Capsule you write a note today and lock it until a future date. This is what it looks like when one of those capsules finally lands in someone's inbox.
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Preview the capsule-opening landing
SEAL
Tap the envelope to open the capsule.
Highlighted features
A letter to your future self.
What this app does and why it exists.
Even the app's developer can't read the contents before the unlock date.
Multiple recipients: send the same capsule to yourself + loved ones.
Export an encrypted .capsule file as backup — survives device changes.
Details
What happens behind the scenes
- How it works
- Write or record today → pick the open date → lock it. On that date the app fires a notification and reveals the contents.
- How it's built
- .NET 10 Blazor Server + MAUI. A shared codebase running as a Windows service with a thin web demo. All state stays server-side and local.
Lock a real capsule on your phone.
Capsule stores audio, photos, and text — and only unlocks them on the date you picked.
Other apps
Other mobile apps
The other live apps in the ERP Mobiles family.