ProbSim vs Probability Theory Foundations

ProbSim is a probability experiment simulator. You can tag fish, flip coins, roll dice, spin spinners, and draw marbles from urns. Predict the probability of a certain outcome, and see whether or not your prediction is supported by the experimental results. ProbSim also challenges you to solve some tricky and easily misunderstood probability problems involving birthdays, game shows, envelopes, coins, hats, urns, and apparent paradoxes.

Probability Theory Foundations is an independent study app for learners who want structured practice in core probability ideas, problem-solving habits, and exam-style reasoning. Built for students, self-learners, and anyone reviewing fundamentals, the app includes 160 questions across Fundamentals, Practical Skills, Common Pitfalls, and Advanced Concepts. Every question includes an explanation so you can understand why an answer works, not just whether it was right. Features: - FSRS spaced-repetition intervals to help review at the right time - Weak-point heatmap to spot topics that need attention - Daily challenge for consistent practice - Mock exams for timed review - Offline practice with no login required - Explanations for every question Practice offline, no login required. Independent study app for Probability Theory Foundations practice. Not affiliated with, endorsed by, or sponsored by any company, certification body, exam operator, or vendor. All trademarks belong to their respective owners.