Your own formulas, calculated in the browser
Write an expression, name its variables, and the panel builds a field per variable and evaluates it with a real parser - operators, functions (sqrt, sin, log, …) and constants. Formulas stay in this browser and export with the rest of your local data.
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Formula browsing, the unit converter, every reference table, physical constants, material property sheets, the full side-by-side comparison, today's replayable quiz round and your calculation history stay free forever, offline and without an account. History lives in your browser, which keeps your most recent 500 calculations and exports them as JSON whenever you want. Every figure on a reference sheet is free to read on the page it came from.