Coin of Fate
Science-backed decision making. 12 free tools powered by cryptographic randomness.
The Probability Lab
12 games and tools, each backed by real mathematics and cryptographic randomness.
Custom Chaos
Replace heads & tails with any two custom options. Pizza vs Tacos? You decide.
Dice Roller
D4, D6, D8, D10, D12, D20, D100. Roll up to 10 dice, re-roll individually, track history.
Magic 8-Ball
Ask the oracle anything. 20 classic responses with the authentic positive/neutral/negative split.
Wheel of Fate
Add your options, spin the wheel. Equal-arc probability ensures perfect fairness.
Truth or Dare
The ultimate party game. Get random truths or dares, or let fate choose for you.
Would You Rather
50+ impossible choices. Pick a side, see how the world voted, spark conversations.
Number Generator
Generate truly random numbers in any range with a dramatic scramble reveal.
Name & Team Picker
Pick one random name, split into teams, or shuffle the order. Fisher-Yates shuffle.
Daily Challenge
A new fate challenge every day. Complete it, track your streak, beat your record.
Streak Challenge
How many heads in a row? Earn badges from Newcomer to Legendary. Climb the leaderboard.
Seance Mode
Create a room and flip together with friends. Real-time multiplayer via shared rooms.
Doom Barometer
Watch global fate unfold. Live statistics from all players — are we doomed or blessed?
Probability Dashboard
Your session statistics with mathematical context, plus the science behind every game.
The Science of Fair Randomness
Cryptographic Randomness
We use the Web Crypto API — the same engine that secures online banking. Unlike Math.random(), crypto.getRandomValues() draws from your OS entropy pool: hardware noise, timing jitter, and physical sources. Each outcome is mathematically impossible to predict.
The Bernoulli Trial
A coin flip is a Bernoulli trial — two outcomes, each with P = 0.5. Physical coins have ~51% bias for the starting face. Our digital flip eliminates this. Over many flips, results converge to 50/50 — the Law of Large Numbers. Watch it live in the hero bar above.
Uniform Distribution
Each face of a fair die has exactly 1/N probability. We use modular arithmetic on 32-bit random integers. Rolling multiple dice follows a discrete convolution — that's why 2d6 produces 7 most often (6 of 36 combinations).
The Gambler's Fallacy
5 heads in a row feels "impossible" but it's just 0.5^5 = 3.125%. Each flip is statistically independent — past results never influence future ones. Believing otherwise is the Gambler's Fallacy. Our Streak Challenge proves it: 10 in a row is 1-in-1024.
Equal Arc Probability
The Wheel divides 360° equally among options. The final position uses a CSPRNG-generated angle, not simulated physics. Each slice has identical probability regardless of spin count — the independence property of true randomness.
Weighted Response Categories
The Magic 8-Ball has 20 responses: 10 positive, 5 neutral, 5 negative (50/25/25 split — designed to be encouraging). Each response has 1/20 = 5% chance via uniform random selection from a finite set.
About Coin of Fate
The Ultimate Free Decision-Making Toolkit
Coin of Fate is a science-backed platform with 12 free tools for making decisions — from coin flips and dice rollers to spinning wheels and party games. Every result is powered by cryptographically secure randomness (CSPRNG), backed by real mathematics.
All Tools, Always Free
- 🪙 Coin Flip — Cryptographically fair heads or tails with live probability tracking
- 🧪 Custom Chaos — Replace heads/tails with any two options
- 🎲 Dice Roller — D4 through D100, multi-dice, re-roll, history
- 🎡 Wheel of Fate — Unlimited options, CSPRNG-powered spin
- 🎱 Magic 8-Ball — 20 classic responses, authentic distribution
- 🔢 Number Generator — Any range, dramatic scramble reveal
- 🔥 Truth or Dare — Party game prompts for game nights
- 🤔 Would You Rather — 50+ questions with vote results
- 👥 Name & Team Picker — Fisher-Yates shuffle, team splitting
- 📅 Daily Challenge — New challenge every day, streak tracking
- 🏆 Streak Challenge — Flip heads in a row, earn badges
- 🔮 Multiplayer Rooms — Real-time decisions with friends
Fairness Guaranteed by Mathematics
Every tool uses the Web Crypto API (CSPRNG) — the same foundation that secures online banking. Our entropy comes from physical hardware sources, making every outcome mathematically impossible to predict or manipulate. Learn more about the science.