# PaddiM8/kalker

Scientific calculator with math syntax that supports user-defined variables and functions, complex numbers, and estimation of derivatives and integrals

Repository: https://github.com/PaddiM8/kalker
Canonical: https://ross.abutalabs.com/products/kalker
Homepage: https://kalker.xyz
Language: Rust
License: MIT
License Family: permissive
Topics: calculator, rust-crate, math, rust
Last push: 2026-07-10T12:49:15+00:00

## Health v2 (maintenance only)
Score: 82/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 91, release rhythm 60, longevity 100
- inputs: {"age_days": 2281, "days_push": 54, "days_rel": 54, "gap_med": 322.0, "n_releases_24m": 3}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1911, forks 85 (observed 2026-08-28T04:05:53.152577+00:00)

## What it is
Kalker is a scientific calculator CLI and web app written in Rust with math-like syntax, supporting user-defined variables and functions, complex numbers, vectors, matrices, and numerical differentiation and integration. It is also available as a Rust crate and npm package, and runs on Windows, macOS, Linux, Android, and in browsers via WebAssembly.

## Use cases
- calculate expressions with a math-like syntax in the terminal
- define my own variables and functions for repeated calculations
- estimate derivatives and integrals of functions
- work with complex numbers, vectors, and matrices
- convert between number bases like binary, octal, and hex
- load a file of predefined physics constants and functions
- compute sums and products over a range
- use a calculator as a Rust library in my project

## When to choose
- you want a fast terminal-based scientific calculator with natural math syntax
- you need user-defined functions, piecewise functions, and variables in a calculator
- you need quick numerical derivative/integral estimation or root finding
- you want a calculator that runs cross-platform or in the browser via WebAssembly

## When to avoid
- you need exact symbolic algebra or a full computer algebra system
- you need highly accurate higher-order derivatives, since estimates can be inaccurate
- you need plotting or graphing capabilities
- you need a GUI-first calculator experience

## Facets
- artifact type: cli-tool
- maturity: active
- function: cli, math
- domain: mathematics, developer-tools
- platform: windows, wasm, cli, rust
- tags: calculator, scientific-calculator, calculus, complex-numbers, rust-crate, command-line, linux, macos, android

## Member repositories
- PaddiM8/kalker (main) score 82

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:53.152577+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:10:46.436758+00:00, confidence not recorded.
  - readme: https://github.com/PaddiM8/kalker (fetched 2026-08-28T04:05:53.152577+00:00, sha b2ad9b4870c3)
  - homepage: https://kalker.xyz (fetched 2026-08-29T10:49:54.321300+00:00, sha 2c2bb19dcc15)
  - registry_crates: https://crates.io/api/v1/crates/kalker (fetched 2026-08-29T10:49:54.324326+00:00, sha 0290d10c0aaa)
- Data as of 2026-08-30T08:39:29.467469+00:00.