# ProbSim vs Millennium Problems

The clearest difference is update cadence: Millennium Problems at every 4 days against ProbSim's every 40 months. Millennium Problems also leads on device support (3 vs 1). ProbSim's advantage is iOS requirement (8.0 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ProbSim ships an update every 40 months, Millennium Problems every 4 days. The most recent releases landed on October 24, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | ProbSim | Millennium Problems |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/millennium-problems/id6761263693/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 40 months | **Every 4 days** |
| Monetization | Free | Free |
| Size | 29 MB | 9 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Bretl](https://appshunter.io/developer/553850818) | [Loic Fonkam](https://appshunter.io/developer/1884693208) |

## What reviewers say

### ProbSim

[App page](https://appshunter.io/ios/app/probsim/id954912323)

Simulate probability experiments with various tools like coins, dice, and spinners. Test your predictions against experimental results and tackle challenging probability problems.

**Highlights:** Probability experiment simulation, Coin flipping, Dice rolling, Spinner manipulation, Marble drawing from urns, Predictive testing, Problem-solving challenges

**Features:** macOS Compatibility

**In-app purchases:** none


### Millennium Problems

[App page](https://appshunter.io/ios/app/millennium-problems/id6761263693)

Explore seven unsolved mathematical mysteries, each with a million-dollar prize. This app adapts content for all skill levels, from middle schoolers to doctoral researchers, with interactive 3D visualizations and built-in quizzes. Learn at your own pace, offline, with no ads or subscriptions.

**Highlights:** Explains seven major unsolved math problems, Content adapts to skill level (Grade 6 to Graduate), Interactive 3D visualizations, Built-in quizzes with XP and badges, Offline functionality, Optional biometric lock

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is ProbSim free?

ProbSim is free to download, with no in-app purchases.

### Is Millennium Problems free?

Millennium Problems is free to download, with no in-app purchases.

### Do ProbSim or Millennium Problems have ads?

Neither ProbSim nor Millennium Problems shows ads.

### Which is updated more often, ProbSim or Millennium Problems?

ProbSim ships an update every 40 months, and Millennium Problems every 4 days. Most recently, ProbSim was updated on October 24, 2026 and Millennium Problems on October 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*