Voice Invoice on iPhone Duo: Record Folded, Review Unfolded

Voice Invoice 2.0 adapts to iPhone Duo. Record a job with the phone closed, then open it to review invoices with a sidebar and full-width detail. Recording keeps going while you fold.

By Sam Whitfield October 2026 3 min read

Sam Whitfield writes about invoicing and getting paid for Voice Invoice, the iOS app that turns spoken job notes into PDF invoices.

Voice Invoice on iPhone Duo: recording on the closed outer display, and the invoice list with a sidebar on the open inner display

Does Voice Invoice work on iPhone Duo?

Yes. Starting with version 2.0, Voice Invoice adapts to both screens on iPhone Duo. Closed, it's the phone layout you already know: tap, talk, and record the job. Open, the app switches to a two-pane layout, with Record, Invoices, Clients, and Settings in a sidebar on the left and your invoice on the right. You don't have to set anything up. The app changes layout the moment you open or close the phone.

Closed: record the job one-handed

The outer display is where most invoices start. You're still on site, one hand is busy, and you want the job details down before you forget them. Closed, Voice Invoice shows the big record button, a running timer, and a slim column of tabs along the side. Everything works exactly as it does on any other iPhone.

Say this

"Invoice for Riverside Family Dental. Service call ninety-five dollars. Two hours of labor at one hundred ten dollars per hour. Replacement valve sixty-four dollars. Net 15."

Not sure how to phrase a recording? The first-invoice walkthrough has scripts you can copy.

Open: review with room to see everything

Open the phone and the same invoice is waiting on the larger inner display. The sidebar stays pinned on the left, so you can switch between Invoices and Clients without losing your place. The invoice gets the whole right side: total, due date, who it's billed to, and the Edit and Send invoice buttons within easy reach.

An invoice for $1,800.76 open on the iPhone Duo inner display, with the Voice Invoice sidebar on the left and Edit and Send invoice buttons at the bottom

This is where the bigger screen pays off. Line items, quantities, and totals are easier to check, and fixing a client name or a misheard price before you send takes less scrolling.

Fold mid-recording? It keeps going

Start talking with the phone closed, then open it to check something, and the recording doesn't stop. The same is true the other way around and in book style. When you tap stop, the invoice is created from the whole recording, not just the part after you changed how you're holding the phone.

A workflow that fits the device

  1. Finish the job and keep the phone closed.
  2. Tap record and say the client, each line item with its price, and your terms.
  3. Tap stop. Voice Invoice builds the draft.
  4. Open the phone and check the invoice on the large screen.
  5. Fix anything that's off with Edit, then tap Send invoice.

Check this on the big screen before you send

  • Client name and billing details are right
  • Every line item you said is there, with the right price
  • Quantities × rates add up to the total you expect
  • The due date matches your terms

FAQ

Do I need a separate app or a new subscription for iPhone Duo?

No. It's the same Voice Invoice app. Update to version 2.0 or later and your existing plan works on iPhone Duo like it does on any other iPhone.

Does recording stop if I open or close the phone?

No. You can start a recording with the phone closed and open it, or the other way around, and the recording keeps going.

Which ways of holding iPhone Duo does Voice Invoice support?

Closed (outer display), open flat, and book-style. In book style the app keeps your content clear of the fold. Your invoice data is the same whichever way you hold it.

Are my invoices stored differently on iPhone Duo?

No. Invoices are stored locally on your device, the same as on any iPhone. See the Privacy Policy for details.

Where can I find more help?

Start with the FAQ. If you're still stuck, use the Contact page.

Next step

If you have an iPhone Duo, update Voice Invoice to 2.0, record your next job with the phone closed, and open it to review. If you're new to voice invoicing, start with how it works.

Get Voice Invoice on the App Store:

Download Voice Invoice on the App Store