Calcy

Calcy is an offline-first notepad calculator. Its public description characterizes it as a tool for writing calculations in a notepad-style format, with unit-aware math built in. Each line can work with quantities that carry units. Calcy also covers uncertainty propagation, which tracks how uncertainty carries through a calculation, and rate reasoning for problems involving rates. The product page is titled 'unit-aware, uncertainty-propagating math' and presents these as its core capabilities.