Splashi Forge

Splashi Forge puts a complete small-craft design studio in your pocket. Choose from ten hull templates -- sea kayak, open canoe, sit-on-top, paddleboard, flat-bottom skiff, v-bottom dinghy, deep-v planing hull, displacement launch, catamaran, and pontoon -- then shape every parameter: length, beam, depth, deadrise, rocker, flare, and more. A live cross-section preview updates as you type, so you see your hull take shape in real time. Once your hull is modelled, Splashi Forge computes a full hydrostatic envelope: displacement, block coefficient, waterplane area, wetted surface, righting lever (GZ) curves, and stability criteria against Sheltered, Coastal, and Expedition profiles. The Trim tab walks you through intact-stability analysis step by step -- add your crew and gear using the built-in load planner, set water conditions, and get a clear pass/fail verdict with a GZ chart and exportable trim card. The Locker tab keeps your gear catalogue and load plans organised. Over 40 bundled items span eight categories -- crew, safety, shelter, power, water, tools, ballast, and payload -- and every item carries 3-D position coordinates so the stability engine knows exactly where the weight sits. Liquid tanks include fill fraction and free-surface moment correction for accurate results even when partially full. The Speed tab closes the loop with resistance and propulsion analysis. Model paddle, oar, electric, petrol outboard, or sail power; pick a surface finish from polished to fouled; add appendages; and read off a power-against-speed curve with a full drag breakdown. All computation runs entirely on your device -- no account, no internet connection, and no subscription required.