Rachii CUBI

Turn iPad and iPhone into a hands-on 3D geometry lab. Rachii CUBI helps teachers and students develop spatial reasoning by predicting, experimenting and explaining what they discover. CUBES AND NETS • Explore up to 27,000 unit cubes. Remove, add or color cubes, separate layers and compare with the full shape. • Fold all 11 distinct cube nets gradually and investigate opposite faces. SOLIDS AND CROSS-SECTIONS • Explore 16 solid families, including prisms, pyramids, cylinders, cones, spheres, frustums and regular polyhedra. • Change dimensions, examine horizontal cross-sections and unfold nets for 8 basic solid families. • Follow calculations on a movable, collapsible card. Approximate results are identified. TOOLS FOR THE CLASSROOM • Rotate and zoom with fingers; use Apple Pencil on compatible iPads. • Write explanations with the pen, erase or undo strokes, and point with a temporary laser. • Start guided experiments, record predictions and conclusions, compare results and reopen saved experiments. • Export JSON to continue experiments in CUBI, or CSV for table analysis. Choose Thai, English, Simplified Chinese, Korean or Japanese inside the app. Your own written notes stay unchanged when you switch languages. Core activities work offline. No account, ads, subscriptions or in-app purchases. Experiments and handwriting are saved on the device; files are shared only when you choose to export them. Designed for middle-school exploration and teacher demonstrations. Teacher and student roles organize the interface; they are not exam-locking controls.