Coin Flip
Heads or tails in one click — cryptographically fair, instantly settled. No server, no tracking.
Your files never leave your device.
The oldest decision-maker, digitized
Flipping a coin has settled arguments for over two thousand years — the Romans called it navia aut caput, "ship or head". The appeal is that it's perfectly neutral: neither side can influence the outcome, and both sides watched it happen. This page is that ritual in digital form. Click, watch it spin, accept the verdict.
Fairer than a real coin
A physical coin is almost fair — tiny imbalances in weight and edge shape give a slight bias to whichever face started up. This virtual coin has no such flaws: each flip draws from crypto.getRandomValues(), the cryptographically secure random generator built into your browser. Heads and tails each get an exactly 50% chance, flips are fully independent (ten heads in a row tells you nothing about the eleventh), and there is no server in the middle to track or repeat a result.
When to flip
- Sports — kick-off sides, first serve, who bats first.
- Household diplomacy — whose turn for dishes, who picks the movie.
- Decisions you're stuck on — here's the real trick: assign the options, flip, and notice which result you hope for while the coin spins. Your gut knew the answer; the coin just revealed it.
- Teaching probability — flip fifty times and watch the streak counter approach 50/50. The streaks that feel impossible (5 heads in a row) happen regularly and are great lessons in randomness.
About the streak counter
The counter below the coin tracks heads vs tails for your session — a small lesson in how randomness behaves. Over a handful of flips it will look lopsided; over hundreds it drifts toward even. It resets when you close the tab, and no data ever leaves your browser.
Why a flip settles arguments
Psychologists note that a coin flip does two jobs: it produces an outcome, and it reveals preference. Watch your reaction the moment the coin shows a side — relief means the flip matched what you wanted, disappointment means it didn't. Either way, the decision is made: follow the coin, or follow the feeling it exposed. That's why this simple ritual has survived two thousand years of technology.
Frequently asked questions
Is the coin flip really 50/50?
Yes. Each flip uses crypto.getRandomValues — the browser's cryptographically secure random generator. Heads and tails each have an exactly 50% chance, and no flip can influence the next.
Are my flips tracked or stored?
No. Flips happen in your browser's memory. The streak counter resets when you close the tab; nothing is sent to a server.
Can I flip multiple times quickly?
Yes — click as fast as you like. The streak counter tracks heads vs tails across your session.
Does it work offline?
Yes. Once the page has loaded, flipping needs no internet connection.