A hinge-angle readout on the inner or outer display
Does Angle Gauge work on iPhone Duo?
Yes, the developer says so: Angle Gauge reads the Duo's hinge angle on either display, with a target angle and saved angles to match.
- App Store confirmedJared Kaeb, the developer, in the App Store description for version 1.0 (released October 13, 2026), which says the phone's hinge works as a protractor, with readings on the inner or outer display. The measuring modes need iOS 27.1 or later.
Adapted for the fold
We're waiting on details of exactly what Angle Gauge changes for the fold. Are you the developer? Tell us.
About Angle Gauge
Angle Gauge turns the Duo’s hinge into a protractor. Set the phone into a corner, against two surfaces or across a joint, and read the angle on the inner or outer display. The developer says it reads to a tenth of a degree. You can also set a target angle and save angles to match by feel.
Evidence reviews
What we checked, when, and what the evidence establishes. Each record preserves the support label at that check.
· App Store page reviewed
App Store confirmed · iphone-duo
The App Store description mentions iPhone Duo: "Angle Gauge turns the hinge of iPhone Duo into a precision protractor." (version 1.0, released October 13, 2026).
App version: 1.0.
Store text only: we haven't seen the app running, and the store page doesn't show how each pose is used.
View reviewed evidence ↗
Related guides
The best iPhone Duo apps so far (October 2026)
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Do your apps work on iPhone Duo? What happens before they're updated
Every iPhone app opens on iPhone Duo, but only updated ones fill the inner display. What an app looks like before its developer adapts it, how to tell which are ready, and which popular apps have said so.
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More for iPhone Duo
KeepCount
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Simulator verified: Tyler Hillsman, the developer, in a submission to FoldHunt on October 17, 2026, with an unframed screenshot of the app in the iPhone Duo simulator in the press kit (keepcount.app). The App Store seller is 1881 Digital, LLC. The release notes for version 1.8 (released October 12, 2026) say KeepCount now adapts to the iPhone Duo's inner and outer displays, with a tabletop layout when it's partly folded.
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Simulator verified: Panoramic Software Inc., the developer, in a submission to FoldHunt on October 18, 2026, and in the App Store release notes for version 7.0.6 (released October 12, 2026), which describe the closed and open layouts. The app's page on the developer's website has pictures of both on the iPhone Duo.
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Simulator verified: Tyler Hillsman, the developer, in the App Store release notes for version 5.4.0 (released October 13, 2026), which add iPhone Duo support with a larger library and side-by-side editing, and in a submission to FoldHunt on October 17, 2026, with an unframed screenshot of the app in the iPhone Duo simulator in the press kit (stickywidgets.app). The App Store seller is 1881 Digital, LLC; the App Store pictures show ordinary iPhones and iPads.
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