SimulitInteractive Monte Carlo & Probability Playground
Simulate complex probabilities, casino odds, financial paradoxes, and logic games in real time.
- Simulators
- 06
- Iterations per run
- 1,000,000+
- Client-side only
- 100%
Start simulating
Monty Hall Paradox
Switch or stay? Watch the two win rates split apart over a million runs.
Martingale & Bankruptcy
Double after every loss and find the exact point where the house edge ruins you.
Blackjack Basic Strategy EV
Expected value per hand for any player hand against any dealer upcard.
Lotto Until Jackpot
Keep buying tickets until the jackpot lands. Track money spent against prizes returned.
Birthday Paradox
How few people you need in a room before two of them share a birthday.
Russian Roulette
Survival odds by chamber count, bullets loaded, and whether the cylinder is re-spun.
Web Worker engine
Every simulator here is a Monte Carlo engine running inside a Web Worker, so a million iterations never block the interface. You change the parameters, the chart redraws, and the numbers converge on the theory in front of you.
Iterations per run
Martingale trades many tiny wins for one catastrophic loss. Table limits and a finite bankroll make ruin a certainty over enough rounds.
Privacy
There is no account and no server-side computation. Parameters and run history live in your browser's localStorage and never leave the device.