Import a preconfiguration, compare the real plan view, and edit gun sectors, single/dual torpedo sectors and longitudinal below-deck compartments. Save JSON locally.

Sketch symmetric ships, edit curves and layered compartments, or open the dedicated arc and compartment editor. Save layouts locally.

Estimate monthly take-home pay, social insurance, housing fund contributions and income tax under Chinese rules. Compare years and export CSV.

Compare commercial, housing fund and combined loans under Chinese lending conventions. View monthly payments with equal-payment or equal-principal repayment.

Clean text and HTML, calculate real hashes, and encode or decode UTF-8 Base64.