Graphing Calculator

The variable x, the operators + − * / ^ (with parentheses), the functions sin, cos, tan, sqrt, cbrt, ln, log, abs, exp, and the constants pi and e. log is base-10; ln is the natural log. Implicit multiplication works too: 2x, 3(x+1).

That's a real discontinuity, not a bug. At points where the function is undefined — 1/x at x = 0, tan(x) at π/2, sqrt(x) for negative x — the plotter lifts the pen instead of drawing a false line through the gap.

Drag the graph to pan, scroll (or pinch) to zoom centered on your cursor, and use the + / − / Reset buttons — they work from the keyboard too.

The graph is drawn by sampling the function at many x-values. Very steep or fast-oscillating functions (like sin(100x) zoomed out) can outrun the sampling. Zoom in on the region you're studying for the true shape.

No. Parsing and plotting happen entirely in your browser, and the parser is hand-written — your input is never evaluated as code.