Digital continuity

You choose
what continues.

Seal your passwords, keys, instructions, and final messages. If you ever stop checking in, Capsulene delivers them — encrypted end-to-end — to the people you trust, exactly when it should.

End-to-end encrypted · Zero-knowledge · No card required to start

🔊 Click for sound
See a Capsule being created — from setup to delivery.
Why Capsulene

Why leave it to chance?

You already protect your information. Capsulene helps you prepare what happens next.

Without Capsulene
  • Important information exists, but no one knows what to do with it
  • Access depends on one person being available
  • Family, cofounders, or trusted contacts are left guessing
  • Cloud folders and accounts are scattered and unexplained
  • The future depends on memory, luck, and timing
With Capsulene
  • What matters has a defined path and a clear recipient
  • The right person is chosen in advance, not discovered under pressure
  • Conditions and timing are set — nothing depends on chance
  • Instructions and context are prepared before they are needed
  • Continuity becomes structured, not accidental

The future should not depend on uncertainty.

See how a Capsule works.

A simple path for what matters to reach the right person, at the right time.

Your capsule
Your recipient
Sealed on your device — encrypted before anything is uploaded. One click on a quiet email says “I’m here.” The capsule stays sealed. No answer? Nothing rushes — a grace period and reminders make sure it’s really time. Only then is it delivered — to the person you chose, and no one else.
How it works

A clear path forward.

What matters now has a path forward.

1

Choose what matters

Start with one thing that would be hard for someone else to understand without you.

2

Create a Capsule

Give that thing a secure continuity path.

3

Add context

Add the access part, instruction, reference, or message that gives it meaning.

4

Choose recipient

Select the person or team who should receive it. Add more than one contact method.

5

Set conditions

Choose a date, confirmation schedule, grace period, or release condition.

6

Activate

Your Capsule stays active until the conditions you defined are met.

What matters now has a path forward.

Control

Built for control, not panic.

Capsulene is designed to avoid rushed, binary release. The goal is structure, review, and controlled delivery.

Confirmation before release
Grace periods
Recipient clarity
Staged delivery
Audit-ready activity
Pause anytime

Payments are handled securely by Stripe as merchant of record — we never see or store your card details.

Disclaimer: Capsulene does not replace legal, financial, or estate planning advice. It provides a digital continuity layer for access-related information and instructions. Please consult with appropriate professionals for comprehensive estate planning.

Zero-knowledge security

Split apart before it ever leaves your device.

Your most sensitive capsules are protected with end-to-end encryption and Shamir’s Secret Sharing. Capsulene keeps just one powerless fragment of the key — so not even we can open your vault, and a breach of our servers would reveal nothing.

Your secret
AES-256-GCM · in-browser

1 · Encrypted on your device

Share 01Share 02Share 03
Shamir · GF(256) · 2-of-3

2 · Key split into 3 shares

You1 share
Your recipient1 share
Capsulene1 share

3 · Held apart, never pooled

2/3

Any two shares rebuild the key; a single share reveals nothing. Because we hold only one, breaching our servers would hand an attacker an encrypted blob and a mathematical dead-end. Your secret stays yours.

AES-256-GCM envelope encryption

A random 256-bit data key seals your secret with authenticated AES-GCM. We store only the sealed envelope — never its contents.

Shamir's Secret Sharing · 2-of-3

Threshold cryptography over the GF(256) finite field shards the key into three. Two reconstruct it; one is mathematically worthless.

Zero-knowledge by design

We hold one share and the ciphertext — that's it. No master key, no backdoor, no way for Capsulene to read your data.

Client-side, end-to-end

Encryption and decryption run in your browser via the Web Crypto API. Plaintext never crosses the network or touches our servers.

Audited secret-sharing

The key-splitting behind every key capsule uses Privy's Shamir secret-sharing library — independently audited by Cure53 and Zellic. Shares export as portable SLIP-39 recovery phrases. Capsulene itself hasn't yet had an independent product audit; that's on our roadmap, and we'd rather say so than let you assume otherwise.

No single point of compromise

Your share, your recipient's share, and ours live in three separate places. Compromising any one of them leaks nothing.

Passkey sign-in (WebAuthn)

Sign in with your device’s fingerprint, face, or PIN instead of a code. Passkeys are phishing-resistant public-key credentials — nothing typeable exists to steal — and always additive: e-mail codes and Google keep working.

Authenticator-app 2FA

An opt-in TOTP second factor gates sign-in — strict every-login mode or once a day, your choice. Codes live in your authenticator app, never in interceptable SMS.

Single-use recovery codes

Eight one-time backup codes, shown exactly once and stored only as hashes. The lost-phone escape hatch that never weakens the lock.

You and your recipient hold the keys that matter — so you stay in control, and only you can ever reveal what’s inside. See the technical details →

New — the file vault

Encrypt whole files — and keep them entirely to yourself.

A key capsule seals a short secret. Now it can seal files too — documents, a keystore, photos, a video message — under the very same 2-of-3 shares. The difference: the encrypted files never leave your device. Capsulene doesn’t receive them, not even as ciphertext. You store them wherever you trust, and only your capsule’s shares can ever open them.

AES-256-GCM · in-browser

1 · Sealed on your device

Your browser encrypts each file with a fresh random key, itself wrapped by your capsule’s key. You get a .capsulene copy of every file.

your USB · cloud · disk

2 · Stored wherever you like

They’re just encrypted blobs — keep them on a drive, in your cloud, anywhere. Nothing readable, and nothing on our servers to breach or lose.

2-of-3 · client-side

3 · Opened with the shares

Your recipient decrypts them on the delivery page with the share you gave them — no account needed. You can too, any time, with your two shares.

We never receive your files. Not the plaintext, not the ciphertext, not the keys. Because they stay with you, the 32 KiB limit on capsule text doesn’t apply — encrypt files as large as your device can handle, and there’s nothing about them for anyone to subpoena, leak, or misplace on our side.

A key for every file

Each file is encrypted with its own random 256-bit key, wrapped by your vault key. Your vault key only ever seals tiny keys — never the file data — so every file stays cryptographically independent.

Authenticated, chunk by chunk

Large files are encrypted in authenticated chunks, so any tampering, truncation, or reordering is detected on decryption — you either get the exact original back, or a clear failure. Never a silent, corrupted half-file.

Yours to keep, forever

The encrypted files are yours — store them in two places, delete the originals once they open. They outlive any subscription, and even outlive Capsulene itself.

Works even if Capsulene disappears

There’s a self-contained offline decryptor you can download — one HTML file that opens your .capsulene files and shares with no internet and no Capsulene. Keep it beside your encrypted files. Its format is published and it’s built from the same code as the app, so your files stay openable for decades.

See how it works

Available on every key capsule — seal files as you create it, or add them later from the Utilities page. See the step-by-step guide →

Pricing

Simple, honest pricing.

Start free. Upgrade to a package when you need more active capsules.

Free

Basic continuity, at no cost.

€0

Free forever

  • 1 text capsules active at once
  • 0 end-to-end-encrypted key capsules
  • Check-ins & grace period
  • E-mail check-ins & delivery
  • Custom check-in timing
  • SMS check-ins & delivery
  • Login-required check-ins (2FA)
Get started

No card required

Pro

Serious capacity for a whole digital estate.

€21.90 / month

or €199.90 / year

  • +15 text capsules active at once
  • +5 end-to-end-encrypted key capsules
  • Check-ins & grace period
  • E-mail check-ins & delivery
  • Custom check-in timing
  • SMS check-ins & delivery
  • Login-required check-ins (2FA)
Choose Pro

Cancel anytime

Secure payment by Stripe

Capsules you create on the free tier stay yours — any future changes to the free tier apply to new sign-ups only. Each capsule uses a slot of its type (text or key), and package slots add on top of the free tier's own allowance. Custom check-in timing, SMS, and login-required check-ins are plan features — a one-time payment can also cover a single capsule. Applicable taxes are calculated at checkout. Payments and invoices are handled securely by Stripe — we never store your card details.

FAQ

Frequently asked questions

Is Capsulene a file storage platform?

No. Capsulene is for continuity — storing context, instructions, or access shards that point to where your real assets live. You can also encrypt whole files with a key capsule, but they stay on your device — we never receive them.

Can I protect whole files, not just a secret?

Yes. A key capsule can encrypt files — documents, a keystore, photos, a video message — with the same 2-of-3 shares that protect your secret. It happens entirely in your browser, and the encrypted files never reach us, not even as ciphertext: you store them wherever you like, and only your shares can open them. Because they stay on your device, the 32 KiB limit on capsule text doesn't apply. Seal files while you create the capsule, or add more later from the Utilities page; your recipient decrypts them on the delivery page with no account needed.

What if Capsulene disappears — can my files still be opened?

Yes. From the Utilities page you can download a self-contained offline decryptor: a single HTML file that opens your encrypted files and shares with no internet and no Capsulene. Its format is published and it's built from the same code as the app. Keep it beside your encrypted files and shares, and everything can be recovered even if we're long gone.

What happens if I miss a confirmation?

We enter a grace period, notify your backup contacts, and attempt to reach you repeatedly before releasing anything.

Can I pause a Capsule?

Yes, you can pause or delete a Capsule at any time as long as it has not been released.

Who can be a recipient?

Anyone. Family, friends, lawyers, or co-founders. You just need their email and ideally a phone number.

Is it a legal document?

No. Capsulene provides digital continuity, not legal estate planning. Use it alongside your will or trust.

How is my account itself protected?

Sign-in uses one-time email codes, Google, or a passkey — there is no reusable Capsulene password to leak. A passkey lets you sign in with your device’s fingerprint, face, or PIN: phishing-resistant, and always an addition (email codes and Google keep working; add up to five under Account → Security). On top of any of these you can enable two-factor authentication with any authenticator app (Google Authenticator, Authy, 1Password, …): choose a code at every login or once a day, and keep eight single-use recovery codes as the lost-phone escape hatch — a passkey never skips the second factor.

What if I lose access to my email address?

Add a backup email under Account → Security — it is the only way back into your account, because support can never restore access, no matter who asks. Recovery through the backup address is deliberately slow and loud: without two-factor authentication it opens a 48-hour waiting window and alerts your usual address, which can cancel the attempt with one click; with two-factor on, your authenticator code still applies, so sign-in through the backup works right away. Set it up before you need it — and answer the occasional “is this still your address?” check so it stays active.

How do I delete my account, and what happens?

You can permanently delete your account from Account → Security. It's confirmed with a code we e-mail you (plus your two-factor code if enabled), then enters a short grace period — a few days during which nothing is erased yet. Change your mind? Just sign in again before it ends and your account is kept, exactly as it was. If the window passes, we permanently delete your account and all your capsules — including already-delivered ones, so unopened recipient links stop working — and cancel your subscription; support can't restore any of it. Deletion completes across our backups within about 35 days, and Stripe keeps your past invoices and tax records as required by law. This is separate from cancelling a subscription, which leaves your account intact.

How does billing work?

Capsulene is free to start. Paid packages are recurring subscriptions — monthly or yearly — that raise how many text and key capsules you can keep active at the same time, and set which optional features (custom check-in timing, SMS, login-required check-ins) your capsules can use. A one-time payment can also cover a single capsule. Payments are processed by Stripe, which acts as the merchant of record and adds any applicable tax at checkout; we never see or store your card details.

Can I cancel, change my card, or get invoices?

Yes. From your account you can cancel anytime, update your payment method, and view or download your invoices through Stripe's secure billing portal. If you cancel, your package stays active until the end of the period you've already paid for.

What happens to my capsules if my package ends?

A failed payment never silently disarms a capsule. If a renewal fails — which can simply mean your card expired, or that something has happened to you — we don't just stop the timer: we start a check-in and ask you to confirm you're around, with your usual grace period and reminders. Confirm and the capsule unschedules (renew your package to re-arm it); don't respond and it's delivered exactly as intended. You control this per capsule in its advanced settings — separately for a failed payment and for a cancellation — with an option that only accepts a signed-in confirmation for the most sensitive capsules. Capsules on the free tier are unaffected either way.

Be responsible with what matters

Do not leave what matters to uncertainty.

Create a Capsule and define what should happen before anyone has to guess.

Your digital life is already modern. Your continuity should be too.