RAT ANGLE support

Live hinge readings require supported hardware and iOS 27.1 or later. Other compatible iPhones can use Demo to explore the interface and Rat Run with simulated readings. Demo is clearly labeled. It does not measure your device’s physical angle.

The number is the device’s hinge angle, or its difference from your Zero reference in Relative mode. It is not a gravity-based level. The 1° and 0.1° settings change display resolution, not sensor accuracy. A case or the way the phone touches an object can change how its hinge relates to that object’s angle.

Hold freezes the displayed measurement and locks its mode and reference. Tap Resume before changing those controls. The physical hinge can still control Rat Run while a gauge reading is held.

Under Target angle, tap Custom, enter a value from −180° to 180° with up to one decimal place, then confirm it. Negative targets are useful in Relative mode. Off removes the target guide.

Open the small rat menu at the top left and choose Measurement tag. Tap Share tag to export the image or choose Save to Files in the system share sheet. The tag is a fixed snapshot with its angle, reference, date and time zone. Demo and held readings are labeled. RAT ANGLE does not maintain a tag history.

Open the rat menu, choose Rat Run, then Play. Fold or unfold to match the Target and hold steady until the bridge levels. The rat crosses automatically. Complete five bridges; Again starts a fresh course. Demo uses a slider. Exit game returns to your gauge reading and calibration.

Pure black, warm white and mustard are the instrument’s fixed palette. There is no light-mode setting. The app respects Reduce Motion for its decorative and game animation.

The app uses the display that the system currently makes active. Its layout changes for closed, partly open and fully open use; it does not switch on the inner and outer displays simultaneously.

Resume the app and check that you are using a supported device and OS. A missing live sample is shown as unavailable; the app retains a number only when you explicitly used Hold. Switching Demo on or off clears Hold and calibration so simulated values cannot carry into live measurements.