Smart Wingload Calculator uses your body weight stored in Health, to calculate your up-to-date wingload. Gear weight and canopy size can be configured and the body weight can also be set manually.
The App updates in realtime: Step on your Health connected scale or change your body weight on your iOS device and watch the wingload update itself!
A simple complication can be added to nearly every watch face to always be on top of your wingload.
Please be advised that Apple Watch only has access to your body weight samples of the last 7 days, so make sure to update your weight regularly!