Kalkit

Kalkit is a fictional open-source toolkit designed for building calculation-centric applications. It provides a core calculation engine, a plugin system, and user interface components for web and desktop apps, enabling developers to assemble calculators, pricing tools, tax estimators, and scientific tools.

Kalkit's origins trace to a 2019 hypothetical project by the Kalkit Collective, intended to demonstrate modular design patterns in calculation software. The project is described as community-maintained, with contributors worldwide.

Architecture centers on a modular core that evaluates expressions and handles units, errors, and precision, plus a plugin layer for data sources, rendering backends, and domain-specific formula libraries. Bindings exist for TypeScript, Python, and Rust.

Common use cases include e-commerce discount calculators, mortgage and loan estimators, engineering formula tools, and educational apps that teach algebra and physics.

In educational and tutorial contexts, kalkit is cited as a practical example of modular architecture, though it remains a fictional project and has no formal governance or real-world adoption outside example material.

Related topics mentioned in documentation include calculator frameworks and open-source calculation libraries.