01
Write a function
Use familiar notation like sin(x), x^2, or sqrt(x).
A clearer way to see equations
Plot it. Tune it. Understand it.
A free, fast graphing calculator for school, study, and the moments when a formula makes more sense as a shape.
No sign-in. No install. Your work stays on this device.
Workspace
LIVE GRAPH
Drag across the plot to inspect a point
Cursor readout
Move over the graph
f(x) = sin(x)
X −10 to 10 · Y −5 to 5
Table / values
See the numbers behind the curve.
Sample the first expression at regular intervals. Change the range or step to focus on a smaller detail.
How to read it
Numbers make patterns tangible.
Use the table to compare exact inputs with the curve. Add a parameter expression such as a * sin(b*x) + c and the values update with the sliders.
Tip: use a smaller step when you are inspecting a fast-changing section of a function.
Statistics / regression
Turn a data set into a story.
Enter one x,y pair per line. Spectrum Calc will plot the points and fit a straight-line model.
Scatter plot
Solve / numeric roots
Find where a function reaches zero.
Use the current graph window to look for numerical roots. This is the first step toward a broader equation-solving workspace.
Enter an expression and search the current window.
Current window
X −10 to 10
Roots are searched numerically across the current x window. Adjust the Graph view first if you want to explore a different region.
Note: numerical results are approximations and may miss roots around discontinuities or very narrow features.
Ad space · keeps the core free
Start in three moves
Everything updates locally, as you type.
02
Shape the window
Set the x and y bounds to focus on the detail you need.
03
Read the pattern
Hover over the curve to inspect coordinates and compare functions.