A Free Graphing Calculator That Runs in Your Browser

The TI-84 graphing calculator has cost $100+ for over two decades while the smartphone in your pocket has thousands of times more computing power. The reason the TI-84 persists is institutional inertia: standardized tests require or allow specific calculator models, and schools buy in bulk. But for actual learning and exploration, a browser-based graphing calculator is better in almost every way. What a graphing calculator actually does At its core, a graphing calculator evaluates a function at hundreds of x-values across a given range and plots the resulting (x, y) points, connecting them with line segments. The resolution -- how many points are computed -- determines how smooth the curve appears. For y = x^2 on the range [-5, 5]: Evaluate at x = -5.0: y = 25 Evaluate at x = -4.9: y = 24.01 ... (hundreds more points) Evaluate at x = 5.0: y = 25 Connect the dots The interesting parts are handling edge cases: vertical asymptotes (where the function shoots to infinity), discontinuities (