# Math & science

> A network of 10 focused, deterministic tools. Every tool has a human page, a JSON API, an OpenAPI description and an MCP tool that all return the same result (inputs, result, units, assumptions, sources, timestamps).

## Machine interfaces
- Tool catalog (JSON): https://math.usefulweb.site/api/v1/tools
- OpenAPI (all tools): https://math.usefulweb.site/openapi.json
- MCP server (all tools + workflows): https://math.usefulweb.site/mcp
- Pick a tool for a natural-language request: POST https://math.usefulweb.site/api/v1/tools/prompt-to-tool-router/calculate {"request": "..."}

## Tools
- [Big-O Crossover Calculator](https://bigocrossovercalculator.usefulweb.site/): When does c₁·n log n beat c₂·n²? Crossover points, log-log chart and run times. API: POST https://math.usefulweb.site/api/v1/tools/big-o-crossover-calculator/calculate
- [Erasure-Coding Playground](https://erasurecodingplayground.usefulweb.site/): Reed–Solomon over GF(256): encode data into k + m shards, lose some, rebuild it. API: POST https://math.usefulweb.site/api/v1/tools/erasure-coding-playground/calculate
- [Floating-Point Explorer](https://floatingpointexplorer.usefulweb.site/): See how IEEE-754 half/single/double store a number: bits, exact value, ULP, rounding error. API: POST https://math.usefulweb.site/api/v1/tools/floating-point-explorer/calculate
- [Graph Algorithm Visualizer](https://graphalgorithmvisualizer.usefulweb.site/): BFS, DFS, Dijkstra, Bellman–Ford, A*, MST, topological sort and SCCs on your edge list. API: POST https://math.usefulweb.site/api/v1/tools/graph-algorithm-visualizer/calculate
- [Graphing Calculator](https://graphingcalculator.usefulweb.site/): Plot up to 6 functions or parametric curves with roots, extrema, intersections and SVG/PNG export. API: POST https://math.usefulweb.site/api/v1/tools/graphing-calculator/calculate
- [Math Workbench](https://mathworkbench.usefulweb.site/): Simplify, factor, differentiate, integrate, solve, take limits, series and plots in one box. API: POST https://math.usefulweb.site/api/v1/tools/math-workbench/calculate
- [Matrix & Linear Algebra Lab](https://matrixlinearalgebralab.usefulweb.site/): Exact-fraction RREF with steps, determinant, inverse, null space, eigenvalues, LU/QR and Ax = b. API: POST https://math.usefulweb.site/api/v1/tools/matrix-linear-algebra-lab/calculate
- [Number-Theory Lab](https://numbertheorylab.usefulweb.site/): Primality, factorisation, gcd, modular arithmetic, CRT, φ, π(n), Collatz, continued fractions. API: POST https://math.usefulweb.site/api/v1/tools/number-theory-lab/calculate
- [Probability & Statistics Studio](https://probabilitystatisticsstudio.usefulweb.site/): Distributions, descriptive stats, confidence intervals and t, chi-square and z tests with p-values. API: POST https://math.usefulweb.site/api/v1/tools/probability-statistics-studio/calculate
- [Step-by-Step Equation Solver](https://equationsolversteps.usefulweb.site/): Solve linear, quadratic, rational and radical equations or linear systems with every step shown. API: POST https://math.usefulweb.site/api/v1/tools/equation-solver-steps/calculate

## Workflows