iPhone Duo apps
Made for iPhone Duo.
Outflow is a private subscription tracker, and on iPhone Duo it uses every bit of both displays. Fold it and your money is on the outer display with the tabs down the side. Open it and everything spreads out like it does on iPad. No bank login, no account, and nothing leaves your phone.
Get Outflow free on the App Store
Folded: your money, edge to edge
On the outer display, Outflow runs right to the top and its tabs sit down the side, under the clock, where your thumb already is. Every row of the outer display goes to your money, not to an empty bar across the top.
Open: room for everything
Unfold it and the same screens spread across the inner display, laid out the way they are on iPad: totals at a glance, every subscription in its own colour, and the free trials about to charge you flagged before they do.
Find the subscriptions you forgot
The guided audit checks Apple, PayPal, a bank statement read on your phone, and your receipts, then shows what you really pay a year.
What makes an app good on iPhone Duo
Apple's guidance for iPhone Duo comes down to a few things. Here's how Outflow meets each one (Apple's checklist):
- Built with the iOS 27.1 SDK. Older builds still run, but sit in the middle of the inner display with empty space around them. Outflow 6.0 goes edge to edge.
- Toolbars and tabs that can run down the side. Outflow uses the system's own tab bar and toolbars, so iPhone Duo can place them vertically.
- Resizes as the phone folds, opens and rotates. No fixed screen sizes and no orientation tricks: Apple's own resizability check found nothing to fix.
- Nothing you need to tap stuck in the fold. Tested in Apple's iPhone Duo simulator closed, open and partly folded.
Questions
Does Outflow work on iPhone Duo?
Yes, from Outflow 6.0 (in testing now). It is built with Apple's iOS 27.1 SDK, which is what lets an app use the whole of both iPhone Duo displays. Folded, it fills the outer display with the tab bar down the side; open, it spreads across the inner display like the iPad version. It was tested in Apple's iPhone Duo simulator closed, open and partly folded.
Is Outflow free on iPhone Duo?
Yes. Outflow is free for up to 5 subscriptions, with reminders, totals, widgets and Siri. Pro is a one-time purchase, never a subscription, and covers your family through Family Sharing.
Does Outflow need my bank login?
No. Outflow never asks for a bank login and has no accounts. Everything stays on your device, and the App Store privacy label is Data Not Collected.
What makes an app good on iPhone Duo?
Apple's own checklist: build with the latest SDK so the app goes edge to edge and its toolbars can run down the side; resize smoothly as the phone folds, opens and rotates; and keep anything you need to tap out of the fold. Apps built with older SDKs still run, but sit in the middle of the inner display with empty space around them.
Get Outflow free on the App Store
Free for up to 5 subscriptions. Pro is a one-time purchase, never a subscription.