Draw with Pen/Eraser, or pick Text and click anywhere on the paper to type directly on it. Toggle dotted paper for grid-style notes. The section below also supports bold, italic, color, highlight, headings, and lists. Everything is saved locally in your browser.
Assistant
Hi! Type an equation, expression, or a percentage question and I'll solve it, e.g. 2x+5=11, sin(30)+2, or 20% of 150.
⚠ For reference only, verify important calculations. This assistant follows fixed math rules, not AI, if it doesn't recognize your input, it will say so rather than guess.
Solve
Linear, quadratic, or cubic equations in x (up to x³). No brackets or functions inside the equation.
Two linear equations in x and y. Solved using Cramer's rule.
Linear inequality in x. Supports >, <, >=, <=.
Graph
f(x) in radians. Use zoom buttons to change the view range.
Formulas
Convert
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Result
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Stats
Numbers
GCD & LCM
Prime Factorization
Simplify a Fraction
Base Converter
Complex Numbers
z1 op z2, for EE (AC circuits), physics, engineering
Matrices
Rows on new lines, values comma-separated. e.g. 1,23,4
Combinatorics & Probability
Permutations & Combinations
Binomial Probability, P(X = k)
Normal Distribution, P(Z ≤ z)
Finance & Time Value of Money
For actuarial, quant finance, economics
Annuity (equal periodic payments)
Calculus (Numeric)
Derivative at a point
Definite integral
Numeric methods (central difference + Simpson's rule), accurate for smooth functions, not symbolic.
Boolean Algebra
Use A, B, C with & (AND), | (OR), ^ (XOR), ! (NOT), parentheses. For CS / digital logic.
Practice
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Score: 0 / 0
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