Free online science and maths tools

View protein structures from the Protein Data Bank in 3D.

Decodes resistor color bands into value and tolerance, and the reverse.

Interactive t curve with p-values and critical values.

Predicts drug-likeness and ADME properties for molecules entered as SMILES.

Computes the Laplace transform and inverse of a function.

Gives t probabilities and critical values for chosen degrees of freedom.

Search catalog of earthquakes by place, time and magnitude.

Simulates ESP32, Arduino, Raspberry Pi Pico and STM32 boards with sensors, displays and WiFi in the browser.

Starts an Arduino Uno project that runs sketches against virtual LEDs, buttons and sensors.

Starts an ESP32-C3 RISC-V project that runs firmware against simulated components.

Starts a MicroPython ESP32 project that runs Python scripts against simulated hardware.

Starts a Raspberry Pi Pico project for simulating C or MicroPython code with virtual parts.

Zoomable 3D map of nearby stars in the Milky Way.

Calculates frequency, duty cycle and component values for a 555 timer astable circuit.

Fits dose-response data to get an EC50 value and curve.

Fits dose-response data to get an IC50 value and curve.

Rotates a shape around a chosen point and shows the new coordinates.

Plots a 3D surface from an equation z equals f of x and y that you type.

Draws Lissajous curves from two sine waves with adjustable frequency and phase.

Estimates pi by randomly scattering points in a square and counting those in a circle.

Simulates a body orbiting a mass with adjustable starting speed and distance.

Shows the frequency spectrum of sound from your microphone or a test tone.

Displays audio from the microphone as an oscilloscope trace.

Maps a wavelength of light to its visible colour with a slider.