Heeltrace: Vessel Stability

An offline small-vessel hydrostatics workbench: displacement, trim, heel, free-surface effects, righting-arm curves, and load cases — computed on device.

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.