iStruct2D turns your iPad into a 2D structural-analysis sketchpad
iStruct2D turns your iPad into a 2D structural-analysis sketchpad. Draw a beam, frame or truss with your finger or Apple Pencil, add supports and loads, and tap once to see exactly how it behaves — reactions, shear, bending, axial force and the deflected shape. Built for engineering students, educators and professionals who want to test an idea, check a result by hand, or simply understand how a structure carries load — without the friction of desktop software. DRAW BY HAND • Drag to place each member; members that share an end automatically join at a node • Endpoints snap to the grid and to existing nodes • Tap any length to type an exact value • Two fingers pan and zoom — or switch on Apple Pencil mode to draw while your fingers navigate ADD SUPPORTS • Pin, roller and fully-fixed supports • Tap to choose the orientation, then drag onto a node • A drop ring turns green the moment a support is in range to attach APPLY LOADS • Point loads and moments • Distributed loads — uniform or trapezoidal, with separate start and end magnitudes • Acting perpendicular to the member, or locked to a global axis ANALYSE IN ONE TAP • Solved with the direct stiffness method • Several independent structures in one workspace, each solved on its own • Unstable structures and mechanisms are detected and clearly flagged READ THE RESULTS • Toggle reactions, shear, bending, axial and the deflected shape • Scrub along any member to read the exact value at any point • Critical (maximum) values are located for you automatically • Tap a single reaction to inspect it on its own • Show, blur or hide the loads and supports over the diagrams • A summary lists every governing value at a glance WORK FASTER • Full undo / redo history • Select a whole structure to move, duplicate or delete it • Switch force units (N, kN) and length units (mm, m) • Open the bundled Demo Examples — a worked frame, beam and truss — to explore EVERYTHING STAYS ON YOUR DEVICE Projects are saved locally on your iPad. No account, no sign-up, no tracking. CO-DEVELOPED WITH THE UNIVERSITY OF QUEENSLAND iStruct2D is co-developed with the UQ School of Civil Engineering. PLEASE NOTE iStruct2D is currently in beta and is intended for learning, exploration and preliminary reference. Results are for reference only — always apply your own engineering judgement. The app is not a substitute for a qualified structural engineer, accredited design software, or compliance with any building code or standard.
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