Free online science and maths tools

Visual editor for commutative diagrams that exports LaTeX code for tikz-cd.

See how sound waves move and change with pitch, and play a keyboard to hear and view the result.

Simple visual editor for building tikz-cd commutative diagrams and copying the LaTeX.

Draws and simulates digital logic circuits from gates to CPUs in the browser.

Browser planetarium showing a star map for any place and time.

Simulates billiard-ball collisions with a physics engine and adjustable elasticity.

Simulates a chaotic double pendulum with adjustable parameters and phase graphs.

Simulates a mass on a spring with damping and plots displacement over time.

Simulation of simple particles attracted and repelled by color rules that form lifelike structures.

Estimates carbon emissions from training a machine learning model based on GPU, hours and region.

Draws electronic circuits and animates current and voltage in real time.

Draws or searches molecules and shows them in 2D and 3D with data lookup.

Evaluates SageMath code in a small web cell for symbolic math, plots and number theory.

Synthesizes Verilog or SystemVerilog and simulates the resulting digital circuit graphically.

Online shell for running SymPy symbolic maths in Python.

Browser tool for drawing beams, frames and trusses, applying loads and viewing N, V, M diagrams and deflection.

Browser viewer for molecular structures that loads PDB, SDF and other files.

Web chemical structure editor that exports MOL, SMILES and other formats.

Web viewer for 3D structures of proteins, nucleic acids and ligands from PDB files.

Simulates a mass on a spring moving in two dimensions.

Compares tracks to find the shape giving the quickest slide between two points.

Simulates a car body on springs and dampers driving over bumps.

Models a pendulum on a cart driven along a track with graphs of the motion.

Simulates a chain of masses on springs and the waves along it.