I built a free online graphing calculator with 35+ presets, parametric/polar/implicit plotting, animated sliders, and ML activation function visualization

Hey everyone,

I've been building a free graphing calculator at https://8gwifi.org/graphing-calculator.jsp and wanted to share it.

What it does:

• Plot Cartesian (y=f(x)), parametric (x(t), y(t)), polar (r=f(theta)), and implicit equations (like x^2+y^2=25) all on the same graph
• Piecewise functions, inequalities, data tables, and statistical distributions (Normal, Chi-squared, etc.)
• Derivative overlay and integral shading with adjustable bounds
• Trace mode that shows coordinates and slope at any point
• Animated parameter sliders -- use a, b, c in any expression and sliders auto-generate. Hit play to animate
• Intersection finder and equation solver (f(x)=0)
• Regression analysis -- fit curves to data points
• Text-to-graph converter -- describe a function in plain text
• Export as PNG or SVG, save/load expression sets, generate shareable URLs 35+ built-in presets across categories:
• Creative curves: Heart, Spirograph, Butterfly, Golden Spiral, Cardioid, Astroid, Nephroid
• Physics & Science: Damped oscillation, Catenary, Wave interference, Projectile, Pendulum phase
• Machine Learning: Sigmoid/Tanh, ReLU variants, Loss functions, Softmax, Gradient descent visualization, Decision boundaries, Bias-Variance tradeoff, Vanishing gradient
• Classic math: Lissajous, Hypotrochoid, Rose curves, Fourier square wave, Lemniscate, Witch of Agnesi, Folium, Cissoid
• Multi-expression demos: Sin+Cos overlay, Circle+Line, Polar flowers, Data+Fit

I built this because I wanted something that handled more plot types than most free tools (especially implicit and parametric in one place), had one-click presets for teaching, and didn't require any account. The ML presets are great for visualizing activation functions and loss landscapes if you're studying deep learning.

Would love feedback -- what presets or features would be useful to add?

Link: https://8gwifi.org/graphing-calculator.jsp