CalcuKit

Local-first calculators and simulation labs. Fast tools for finance, unit conversion, time, health and business scenarios with optional live FX fetch.

CalcKit is a local-first calculator and simulation toolkit.

Key features:

Finance tools: loans, interest, returns, P&L, and fee analysis. Unit converters: length, weight, temperature, data and more. Time and utility tools: date, countdown, expression, custom unit rules. Simulation labs for scenario planning and comparison. Most features work offline; live exchange rates are optional. No account is required for core usage.