flipthecoin.app
"Flip The Coin"
Flip a coin online with a free 3D simulator. Instant heads or tails result — no app needed. Fair, random, and beautiful.
FlipTheCoin.app is more than just a game
Play the Game
The original game from flipthecoin.app, with real physics.
Learn from the Blog
Please don't let a coin decide for you. Learn about probability, statistics, and more.
Take the coin to your browser with the Extension
Install the extension and flip a coin privately from any tab of your browser.
Latest from the blog
View all articles →Flipping a Coin Until You Get Pi
Discover how flipping a coin until heads outnumber tails leads, unexpectedly, to the number π — through the Catalan numbers and the arcsine series.
What Do Pascal's Triangle and a Coin Have in Common?
Discover how Pascal's triangle connects combinatorics, algebra, and probability — explained step by step through coin flips.
Heads or Tails — The Complete Guide to the Coin Toss
Why do we call it heads or tails? A look at the history, mathematics, and surprising science of the coin toss — from Julius Caesar to modern physics.
A Fair Coin Toss
The game of uncertainty: Tossing a coin gives us roughly 50% chance of it landing heads and 50% chance landing tails, but until the coin lands we don't know what it will be!
Interestingly, real-world human-made coin flips aren't always perfectly fair. Studies have shown that a coin has about a 51% chance of landing on the same face it started on. Factors like air resistance, the coin's weight distribution, and even the mechanical motion of flipping can affect the outcome. For instance, a (PDF) 2007 study by mathematicians Persi Diaconis, Susan Holmes, and Richard Montgomery (DHM) found the chances on landing the same face was 51% for natural coin tosses.
Theoretically, a coin is fair and the outcome is random. But in practice, it's not.
Each coin toss is an independent "event" and the outcome of the previous toss does not affect the probability of the next toss. But, as we described, the real-world coin toss is not as fair as we'd like.
In flipthecoin.app, we try to make the coin toss as fair as possible by introducing a component of randomness so it's non-deterministic. Our coin toss cannot be tricked as easily.
Did you enjoy this story?
Visit the Blog
Browser extension
Always one click away
Install the extension and flip a coin from any tab. Same physics, same fairness, no installations of weird games.
Frequently Asked Questions
Newsletter
Want to know more about the science of coin flips or just interesting facts about statistics and how they apply in life? Are you passionate about the mathematics of coin flips and want to learn more? If you're interested in the physics of coin flips and want to learn more, you're in the right place.
Stay tuned for more articles and resources. Sign up for our newsletter to get notified when we launch the game, the browser extension, and more!