StoneArch Keystone

StoneArch Keystone is an engineering calculator designed for stonemasons, restorers, architects, and builders working with classical stone arches and vaults. The application provides geometric analysis for various arch profiles including semicircular, pointed, segmental, and multi-centred basket handle geometries. Calculate exact bevel angles and dimensions for individual voussoirs and the central keystone with precise boundary tolerances. The built-in rigid-block statics engine evaluates lines of thrust, geometric safety factors, sliding limits, and base eccentricity for supporting piers. New capabilities in this version introduce a comprehensive materials library, automated timber centering layouts for construction, and a restoration survey tool that fits historical profiles to measured points. The interactive visual canvas allows you to adjust structural spans and rises in real time while inspecting individual stone parameters, templates, and geometric deviations. Visual safety indicators and sweep charts help verify structural stability during planning. Export comprehensive project data, stone schedules, and 1:1 cutting templates directly from your device.

Version 1.0.3 introduces extended arch geometries including segmental and basket handle variants alongside a comprehensive materials library.