Track every fold on iPhone Duo.
Fold Counter logs your hinge cycles, monitors device posture, and creates a verified hardware health record for resale.
Telemetry built for the physical hinge.
The app connects to iOS 27 hinge sensors to track mechanical wear and posture states throughout the day.
Track your daily usage against Apple's hardware durability benchmark.
Event-based tracking reconciles sensor history on unlock without continuous background polling.
Distinguishes between closed cover use, tabletop hands-free orientation, and full canvas workspaces.
How it works.
Designed for dual-screen hardware without altering how you use your phone.
No accidental counts.
Phones flex slightly in pockets and bags. Fold Counter uses CoreMotion data and a two-stage threshold so small shifts never register as a fold.
Cover and canvas balance.
Measures time spent on the compact outer display versus the unfolded inner canvas. Understand your daily posture distribution across closed, propped, and flat orientations.
Verified proof for buyers.
Export a tamper-evident diagnostic report signed by the Secure Enclave. Attach it directly to Swappa or eBay listings so buyers can verify physical hinge cycles before purchasing.
A cycle count for your hinge.
Similar to battery health on iOS, but designed for the physical folding mechanism.
Releasing October 23, 2026.
iPhone Duo arrives in stores this October. Fold Counter will launch on the App Store the same day.
Developer beta access begins with the release of Xcode 27.1 beta.