Education
1,350 interactive pages · most loved first · page 10 of 57· Tonble one of these
CityExtremes
A lookup tool that shows the closest and farthest cities from any city in the world, filterable by continent, with dista…
Clear Dark Sky
Star-gazing weather forecasts in clear-sky chart form, showing hour-by-hour cloud cover, transparency, and seeing for th…
Clearer Thinking
A nonprofit offering dozens of free interactive tools, quizzes, and mini-courses for improving decision-making, habits,…
CleverMind Teasers
Interactive visualizations of probability puzzles like the 100 Prisoners Problem, with simulations you can run and tweak…
Clio Infra
A collaborative database of long-run historical statistics on income, education, and health, letting researchers chart g…
ClojureScript Koans
A browser-based set of koans that teach ClojureScript through failing tests you fix one by one, nudging you along a path…
Cloud TTS
A free text-to-speech tool where you paste text and hear it read in a natural voice, with 140 languages and karaoke-styl…
CMD Challenge
Solve one-line shell challenges in a built-in terminal, from basic file tricks to advanced pipelines, with instant feedb…
CO2 Levels
An interactive graph of atmospheric carbon dioxide and global temperature, letting you zoom from the recent Mauna Loa re…
Coast FIRE Calculator
A free Coast FIRE calculator that works out how much you need invested today to compound to financial independence with…
Cochineal: Mexico's Red
An online exhibit from Harvard Museums of Science and Culture on cochineal, the insect-made red dye of Mexico, tracing i…
Code Your Own Flappy Bird
A Code.org tutorial level where you write blocks of code to build your own Flappy Bird game, a gentle way to learn progr…
Collision Detection
An online book with live canvas demos that teaches how objects collide in games and simulations, from points and circles…
Color & Contrast
An interactive guide to color for interface designers, with hands-on demos of hue, saturation, contrast and color percep…
Color Parrot
An explorable dictionary of color names that shows history, related shades and the stories behind names, handy for brows…
Color Wheel Calculator
A color wheel tool from Sessions College that generates palettes by picking primary, secondary, complementary, and analo…
ColorBrewer
A classic interactive tool for choosing color schemes for maps and charts, showing how each palette looks across differe…
Combination Sum Calculator
A calculator that takes a list of numbers and shows every combination of them that adds up to a target value, handy for…
Combustion Lab
A browser-based internal combustion engine simulator where you build an engine, watch the pistons run and read real ther…
Compare Languages
An online calculator that measures the genetic proximity between any two of more than 170 languages, giving a distance s…
Compare Sizes
A visual size-comparison tool that draws any two objects side by side in 3D at scale once you enter their dimensions in…
Compare Your Income
An OECD tool where you guess where your income ranks in your country, then see the real distribution and how your sense…
Complex Analysis
A visual and interactive introduction to complex analysis, with dynamic demos of functions, mappings and fractals that m…
Complex Polynomial Roots Toy
An interactive toy that visualizes the relationship between a polynomial's roots and its coefficients, letting you drag…
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