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∫ Riemann Integral Rectangles (2D)

Interactive 2D Riemann sum visualiser: pick a function, drag bounds a/b, choose Left/Right/Midpoint/Trapezoid rules, and watch the rectangle-sum approximation converge to the true definite integral.

Mathematics2DEasy60 FPS📱 Mobile-adapted⇄ 3D version

⚙ Under the hood

Build Riemann sums by hand: pick a function, drag the interval bounds, and switch between Left, Right, Midpoint, and Trapezoid rules to watch the rectangle-sum approximation converge to the true definite integral. A live error panel tracks how fast each method closes the gap as the rectangle count grows.

calculusintegrationriemann-sumnumerical-methodsconvergencemath

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install