Write a letter to your future self, a birthday surprise, or anything worth preserving. Set an unlock date — it stays sealed until that exact day. Not even we can open it early.
"By the time you read this, I hope you've become everything you dreamed of today..."
How it works
A letter to your future self. A birthday surprise. A promise. Anything worth preserving.
Choose exactly when it opens — tomorrow, next year, or a decade from now.
On that day and only that day, the message unlocks. No waiting, no chasing.
Privacy & security
Your message is encrypted in your browser before it ever leaves your device. No single party holds the key. No early access — for anyone.
Not us. Not a hacker. Not a court order. The unlock date is enforced by cryptography — not a server setting that can be changed.
Your message's key is split across independent servers. All of them must agree before anything can be decrypted — and only on the unlock date.
Your message is encrypted on your device before it is ever transmitted. We store only the encrypted bytes — we cannot read the contents.
Use cases
Capture who you are today. Let future-you discover it at exactly the right moment.
Write a message that opens on someone's birthday, anniversary, or graduation — automatically.
A business pact, a personal promise, or a life goal. Delivered when the moment arrives.
A note to open after the journey ends. A capsule for the day everything changes.
FAQ
A digital time capsule is a message you write today and seal until a date you choose. With Aion, your message is encrypted in your browser the moment you seal it — it becomes readable only on or after your chosen unlock date.
Sign in to Aion, write your message, enter your own email as the recipient, and pick a future date. Aion seals it instantly. When that day arrives, visit your vault and open it.
Yes. Enter the recipient's email when composing. They sign in to Aion on or after the unlock date to read it. You can write birthday surprises, milestone messages, or anything meant for someone else's future.
No. Not us, not a hacker, not a server breach. Your message is encrypted in your browser before it leaves your device, and the decryption key is split across independent servers that only cooperate on the unlock date.
Yes — Aion is currently free to use.
Nothing — your message stays available in your vault and can be opened any time after the unlock date. There's no expiry on already-unlocked messages.