Twelve Two Labs

Estimates and signatures

SignOff

Show a customer an estimate and get it signed, in person, on your iPhone. On iPhone Duo, you close the phone and hand it over.

  • Write an estimate with line items, optional items, discounts, tax and a deposit, worked out to the cent
  • Acknowledgments too, for forms that need a signature but no prices, with starter terms you can edit
  • On iPhone Duo, tap Present, close the phone and hand it over; the customer reviews and signs on the outer display
  • Customer Mode is locked: the customer sees only the estimate, the terms and the signature pad, never your other work
  • The customer can accept or decline optional items, check each consent box and sign with a finger
  • Only you can leave Customer Mode, with Touch ID, Face ID or your passcode
  • A PDF with the signature and a signing certificate, backed by a tamper-evident audit trail
  • No account and no server: estimates, signatures and your business details stay on the phone

Coming soon. SignOff is not released yet. This page is published early so its support and privacy information is available. Choose Notify me to get one email when it launches, and nothing else.

Screens

Select a screen to see it larger.

  • Write the estimate on your phone: line items, units, tax and optional extras.
    The line items of estimate EST-1001: a quiet bath fan with humidity sensor at $189.00, 3 hours to remove the old fan and wire the new one at $85.00 an hour ($255.00), and a roof vent cap with insulated duct at $64.50, each marked Labor or Material with Taxable and Optional switches.
    Write the estimate on your phone: line items, units, tax and optional extras.
  • The customer reviews the estimate and chooses any optional items.
    Customer Mode, in large type: Riverbend Home Repair, Estimate #EST-1001 for Pat Moreno, the scope of work, each line with its price, a wall timer switch for $45.00 marked Optional. Add this? with a switch, the subtotal, and Continue and Decline buttons. A small lock sits in the corner.
    The customer reviews the estimate and chooses any optional items.
  • Terms come before the signature, and each consent box is checked separately.
    General service terms in large type, with the version label v1 below, then three checked boxes: I have reviewed the estimate and agree to the work described, I have read and accept the terms above, and I agree to do business electronically. Back and Continue buttons sit at the bottom.
    Terms come before the signature, and each consent box is checked separately.
  • The customer signs with a finger and chooses where their copy goes.
    The signing screen: the name Pat Moreno, a handwritten signature on the pad with a Clear button, the sentence adopting it as an electronic signature on Estimate #EST-1001 for $593.63, Send my copy to with an email address and phone number, and a large Sign button.
    The customer signs with a finger and chooses where their copy goes.
  • Done. Only the owner can unlock the phone and leave Customer Mode.
    A green check mark and the words Thanks, Pat. Your copy will go to pat.moreno@example.com and 513-555-0187. Please hand the phone back. A small lock in the corner is the only way out of Customer Mode.
    Done. Only the owner can unlock the phone and leave Customer Mode.
  • A signed PDF with a tamper-evident audit trail, kept on your phone.
    The signed record for EST-1001: a green Audit chain verified line, signer Pat Moreno, the signing time in local time and UTC, mode In person, handed over, the PDF's SHA-256 fingerprint, You confirmed you watched Pat Moreno sign, and the first page of the signed PDF.
    A signed PDF with a tamper-evident audit trail, kept on your phone.

SignOff is for the moment at the kitchen table or the front desk when a customer needs to look over an estimate and sign it. You write the estimate on your iPhone, hand the phone over, and get it back with a signature and a PDF.

Fold and hand it over

On iPhone Duo, tap Present, close the phone and hand it across. SignOff carries on in Customer Mode on the outer display. The customer reviews the estimate, chooses any optional items, reads the terms, checks each consent box and signs. Customer Mode is locked: there is no way from it to your other estimates or your settings, and only you can leave it, with Touch ID, Face ID or your passcode. On every other iPhone the same flow runs with buttons.

A record you can stand behind

The customer signs a fixed copy of the estimate, never the live draft. Each step is written to an audit trail in which every entry is chained to the one before, so a change after signing shows. The PDF carries the estimate, the signature and a signing certificate with the times and the document ID, and you can share it by Mail, Messages or Files. Signed records never change; when something needs to change, you make a revision with its own number. SignOff is designed to capture the evidence courts look for; it is not legal advice.

Your business, on your phone

Set up your business name, address, phone, email, license and insurance lines, default tax rate and estimate numbering once. Money is worked out to the cent, with discounts spread across the lines they apply to. Everything is stored on your iPhone. There is no account, no server and no analytics.

Pay once

Your first three signed documents are free. After that, SignOff Unlock, a one-time $24.99 purchase, lets you sign as many as you need, with no subscription. SignOff 1.0 is coming to the App Store for iPhone Duo and runs on other iPhones on iOS 27.1 or later.

Questions about SignOff

Who is SignOff for?

Local service businesses that quote in person: handymen, HVAC technicians, cleaners, small clinics and anyone else who wants a customer to look over an estimate or an acknowledgment and sign it before the work starts.

How does the handover work on iPhone Duo?

When the estimate is ready, tap Present, close the phone and hand it to the customer. SignOff carries on in a locked Customer Mode on the outer display, where the customer reviews the estimate, accepts the terms and signs. When you get the phone back, you unlock it with Touch ID or your passcode.

Does it work on an iPhone that does not fold?

Yes. On every other iPhone the same flow runs with buttons: tap Present, hand the phone over, and the customer reviews and signs on the screen.

What does SignOff record when a customer signs?

SignOff is designed to capture the evidence courts look for: what the customer saw, when, and how they signed, recorded in an audit trail that shows if anything was changed afterward. Whether a particular agreement is binding depends on where you are and what it says. SignOff is not legal advice.

Do you take payments?

No. SignOff records an estimate and a signature. It does not take payments from your customers.

How does the customer get their copy?

The customer can give an email address or phone number when they sign. SignOff never sends anything itself: you share the signed PDF with them by Mail, Messages or Files.

What does it cost?

Your first three signed documents are free. After that, SignOff Unlock, a single $24.99 purchase, lets you sign as many as you need. There is no subscription.