Flow

From template to seal.

The five steps below walk you through SEAL end to end, and explain the reasoning behind each step.

Pick a template

Tap "New Receipt" and choose a ready-made template: debt/loan, freelance work, sale, appointment/service or contractor. Add a short subject if you like.

Each template comes with the fields that matter for that kind of agreement.
Not finished? "Save as draft" keeps the form, and you can pick it up later from Archive → Drafts.
The subject is optional, but a clear one makes the receipt easier to find in your archive.

Fill in the details

Answer the template's short questions: what, how much, when. SEAL turns your answers into numbered items, and you can add your own.

Items are written from your answers, so the key terms are stated plainly.
Anything the template doesn't cover can go in as an extra item.
A receipt holds 3 to 9 items: enough for the key terms, short enough to read at a glance.

Pair with the other person

When you tap Send, SEAL opens a pairing session: enter your name and tap "Create Session" to get a pairing code. The other person joins with it on their phone, and your receipt goes to them. You can also pair first from the home screen with "New Pairing".

The code is 6 characters (letters and digits), valid for 30 minutes and single-use.
Share it however suits you: send the invite link over WhatsApp or any app, show the QR code face to face, or read the code aloud on a call.
Every receipt gets its own pairing, so it only ever reaches the person you just paired with.

They review it

The receipt lands in their "Incoming" tab. They can approve it, suggest an edit, or reject it. If they suggest an edit, you can accept it, reject it, or revise it again.

They get a push notification and can open the receipt right away.
When an edit is suggested, the two versions are shown side by side.
You can go back and forth until you agree on one version.

Seal it

When the person whose turn it is approves the latest version, the receipt is sealed. That approval is signed with the Ed25519 key on their device and added to the audit chain. Either of you can download the PDF at any time.

The seal closes with a single approval, signed with the approving device's Ed25519 private key.
The PDF shows the content hash, party details, a QR code and a public verification link.
A sealed receipt can't be changed; if the terms change, you create a new receipt.

Add weight to your word.

Available on the App Store and Google Play. Reviewing, approving and verifying receipts is free; creating a new sealed receipt requires SEAL Plus, and eligible new subscribers get their first 3 months free.