Free online science and maths tools

Portuguese-language 3D viewer for caffeine with ball-and-stick and space-filling models plus structure and property notes.

Sandbox where emoji particles orbit placed bodies (planet, sun, moon) with gravity, damping and trace controls.

Particles bounce in a container; change the temperature and watch wall collisions and a bounce-count chart.

Chinese-language calculator that plots an improved Gaussian antenna beam model from beamwidth and main/side-lobe parameters.

Plots the Maxwell-Boltzmann energy distribution and shows how temperature and activation energy change reacting molecules.

Launches a projectile from set initial conditions and reports range, maximum height, time of flight and live velocity.

Chinese-language calculator for radar and reconnaissance range from transmit power, antenna gains, sensitivity, loss and frequency.

Calculator for Collatz sequences, listed among a teacher's quick AI-built web apps.

An interactive Conway's Game of Life grid shared as a Claude artifact.

Simulates a double pendulum so you can vary the starting angle and watch motion shift from regular to chaotic.

Colorful Mandelbrot viewer with zoom in, zoom out, reset and a high-precision mode.

Animation of bridge oscillation in wind, driven by a wind speed slider, based on the Tacoma Narrows collapse.

Maps recent iNaturalist sightings of a species you search for.