Updated 21 October 2026. These terms cover the RiseSpan: Slope Calculator app. Your use of the app is also governed by Apple's Licensed Application End User License Agreement.
RiseSpan calculates two-dimensional right-triangle geometry — grade percentage, angle, vertical-to-horizontal ratio, rise and slope length — from values you enter. Horizontal Run means level distance, not the length along a sloped surface.
RiseSpan does not measure physical distances or angles, and it does not determine compliance with building, accessibility, plumbing, safety or any other codes or standards. Results depend entirely on the values and units you enter. Check critical work with appropriate measuring tools, the applicable code and a qualified professional. Diagrams may be drawn not to scale and are marked when they are.
RiseSpan Pro is an optional one-time, non-consumable in-app purchase sold by Apple at the price shown in the App Store. It adds unlimited projects, custom calculation names and notes, PDF/CSV export, input presets and full history. It is not a subscription. Purchases can be restored on devices using the same Apple Account with "Restore Purchases". Refunds are handled by Apple. If Pro access ends, your saved data is not deleted.
The app is provided "as is" without warranties of any kind to the extent permitted by law. To the extent permitted by law, the developer is not liable for losses arising from reliance on calculations, including incorrect input or unit selection.