Time Capsule

Choose a way to begin

What are you saving it for?

Some people already know what they want to say. Some need questions. Some want to keep something for someone they love.

A letter for my child Sealed until they turn 18. A grandparent's story For the grandkids still to come. An anniversary A message that waits for the date. A newborn A letter for someone who cannot read yet. Graduation For the day they finally cross the stage. A farewell Some goodbyes arrive later. Instructions for when I'm gone Where everything is, for the person you trust.

Three ways to beginWrite something now, come back to capsules you already have, or send one forward as a gift.

Create a capsule Go straight into the full builder. Find my capsules Use your email to get back into your dashboard. Gift a capsule Make something meant for someone else to receive later.

Start guided with questions →

Don't have a moment in mind? Start from a question

Prediction templates

Privacy, security, and how it works

Our promise

Private by designYour capsule is encrypted before it leaves your device.

Stored safelyEncrypted payloads are stored with multiple recovery mechanisms in mind.

Locked until the futureYour capsule stays closed until your chosen unlock time.

Email used carefullyYour email is used only for delivery and reminders.

How it works

Timelock encryption via the drand network · Encrypted payload stored on Cloudflare · Capsule metadata in Cloudflare D1 · A scheduled Worker checks for unlocks · Email confirmation and unlock reminder when configured.

Policy & ownership

Read the long-form commitment we make to people who trust us with something sealed, plus a practical guide to leaving the right access behind for the people you love.

Read our pledge → Digital legacy guide →

Book of Lives

Time Capsule is the private layer. Memory Pages are the collective one.

Time Capsule lets one person send something forward. Memory Pages do the opposite emotional job: they gather what many people remember about one life, so those stories do not fragment and vanish.

Memorial pages, retirement tributes, milestone pages, and community remembrance all belong here.

Explore Memory Pages Create a Memory Page

For museums, universities & events

Running a collective memory project?

Time Capsule works at institutional scale — exhibits, enrollment rituals, alumni archives, community events. Get in touch.

Learn more →

Time, memory, and human history

Time capsules are older than the phrase “time capsule”

Long before modern capsules were sealed in steel, humans were already leaving memory objects for the future: foundation deposits, tomb objects, inscriptions, memorial books, and messages meant to outlast their makers.

We pulled together a short history of why people do this at all, how the modern time capsule became popular, and what this project is really continuing.

Before the 20th century Egyptian tombs, Greek inscriptions, church memorials, and early foundation deposits.

Modern popularity The Century Safe, the Crypt of Civilization, and the Westinghouse capsules turned the idea into a public ritual.

Why it matters now People still want context, continuity, and a way to speak across time, not just store files.

Read: Time Capsules and memory saving in human history

Some words are meant to arrive later. This is for those.

Built with love for memories, by emot.