Inside the app
A closer look.
About this app
Made for a clear purpose.
Heeltrace: Vessel Stability is a focused, fully on-device app. An offline small-vessel hydrostatics and loading workbench for displacement, trim, heel, free-surface effects, righting-arm curves, and load cases.
KEY FEATURES - Editable vessel hydrostatic stations - Load-case and tank ledger - Corrected GM and heel estimate - Trim and draft-change screening - Righting-arm scenario plot - Editable complete sample and local project persistence - CSV input plus local PDF and data export - Fifty-two original offline reference plates
ONE-TIME AND PRIVATE - One paid download; no subscription or in-app purchase - No account, advertising, analytics, tracking, or developer-operated backend - Core features and bundled content work offline - Work remains on device unless you deliberately share or export it through an Apple system interface
Educational and preliminary planning aid. Use approved stability information and a qualified naval architect for operation or certification.
