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Spectrum Calc

Build beyond the handheld

One calm home for serious math.

Explore the capabilities you asked for in focused workspaces. Everything here runs in your browser first, with no account required for the core tools.

12 workspaces · v0.4.0

Parametric, polar, and inequality graphs

Switch the model and draw it immediately. Use x, y, t, and standard functions such as sin, cos, and sqrt.

primary curveparametric/polarinequality region

Regression and statistics

Compare a straight line, quadratic curve, or exponential model against your data. Enter one x, y pair per line.

1, 2
2, 3.1
3, 4.8
4, 6.2
5, 7.1
6, 8.9

Enter data and fit a model.

Equation solver

Write an equation with =. The solver searches the chosen interval numerically and reports real roots it can find.

Equation in x

Try x^2 = 4 or sin(x) = 0.

Probability tools

Quick distributions for learning and estimation. Results are computed locally.

Choose a distribution and calculate.

Matrices, vectors, and units

Small, transparent calculations first: 2×2 matrix determinant/inverse, vector products, and common unit conversion.

2×2 matrix

Vectors

Spreadsheet mode

Enter numbers or formulas. Supported starters include =A1+B1, =A1*2, and =SUM(A1:A3).

Select a cell to see its value.

3D graphing

Plot a surface z = f(x,y), choose a preset, or edit the expression. Rotate the wireframe to inspect it.

Rotation−35°

Geometry workspace

Edit the two points or their coordinates. The diagram updates with the line, midpoint, and distance.

CAS / symbolic algebra starter

Differentiate, integrate, or normalize common polynomial and trigonometric expressions. For example: 3*x^3 - 2*x + sin(x).

Expression in x

Python notebook

Run Python in the browser through Pyodide. The first run downloads the runtime; after that, browser caching can make it feel much faster.

import math
values = [round(math.sin(i / 4), 3) for i in range(9)]
print(values)
print("mean =", round(sum(values) / len(values), 3))

Your output will appear here.

Offline mode

Install the calculator as a small progressive web app. The core pages and the dependency-free tools can be cached for use without a connection.

Offline setup has not been checked.

Service workers cannot be installed from a file:// preview. Use a normal web address or local web server for this button.

Classroom tools

Create a small shareable lesson pack locally. This is the foundation for teacher prompts, examples, and student practice without requiring accounts.

Lesson title

Teacher note

Lesson packs are local files for now. Cloud classrooms can be added after the core calculator is stable.