MKUnits

Uses Decimal type for calculations, ensuring high accuracy in conversions, which is highlighted in the example showing exact kilogram to pound conversions without floating-point errors.

Allows easy addition of new unit groups or units via straightforward extensions, as demonstrated in the README with code snippets for creating custom units.

Units are marked with @unchecked Sendable, enabling safe use in concurrent Swift code without extra boilerplate, as noted in the key features.

Supports common physical quantities like mass, length, and temperature out of the box, covering needs for fitness, engineering, and weather apps.