Pick the open day
Choose any date in the future — a birthday, a New Year, ten years out. The countdown starts the moment you seal.
A private time capsule for your phone Say it now.
Say it now.
Read it later.
Write a note, add photos, pick the day it opens — a message to whoever you become. Once you seal a capsule, not even you can open it early.
Future you is listening.
Choose the open day and let it go. Capsule brings it back right on time.
Get started
To me, at 25 Sealed for 2 years, 3 days
Opens today 1 January · 09:00
Sealed means sealed.
No preview No export No shortcuts
A capsule you can peek at is just a note. Capsule removes the option — from everyone, including you.
What's inside
Small app. One serious promise.
Everything Capsule does is in service of a message arriving intact, on the day you chose.
Sealed means sealed
Once you lock a capsule, not even you can open it early. No preview, no export, no shortcuts.
Biometric seal
Lock a capsule to your fingerprint or face. Only the same you, on the same device, gets it back.
PIN on open
The app itself sits behind a 4-digit PIN, so a borrowed phone never means a read capsule.
Notes, photos & more
Write a rich-text letter and attach photos, audio or video — up to 25 MB per capsule. It is a message, not a hard drive.
Open-day reminders
Capsule schedules a local notification for the exact day. It comes back to you right on time, even offline.
Yours only
Every capsule lives on your device in a local database. No account, no cloud, nothing leaves the phone.
Light & dark
A calm lavender palette in the day, a deep plum one at night. The whole app repaints in a tap.
Three steps
Write it, seal it, meet it again.
- 01
Write it
A note to whoever you become. Add the photos you want them to see.
- 02
Seal it
Pick the open day, lock it with your fingerprint, and let it go.
- 03
Meet it again
On the day, Capsule brings it back — the words, the pictures, the you from before.
Get Capsule
Free, open source, and yours.
Grab the latest Android build below. Linux, macOS and Windows builds can be compiled from the same Flutter source.