# SKoolKool vs Millennium Problems

The clearest difference is update cadence: Millennium Problems at every 4 days against SKoolKool's every 10 days. On price, ads, in-app purchases and device support there is nothing between them.

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

SKoolKool ships an update every 10 days, Millennium Problems every 4 days. The most recent releases landed on October 7, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | SKoolKool | Millennium Problems |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/millennium-problems/id6761263693/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 4 days** |
| Monetization | — | Free |
| Size | 47 MB | 9 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Boudjemaa DJEBARRI](https://appshunter.io/developer/1860206219) | [Loic Fonkam](https://appshunter.io/developer/1884693208) |

## What reviewers say

### SKoolKool

[App page](https://appshunter.io/ios/app/skoolkool-ai-study-tools/id6756345298)

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

**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 SKoolKool free?

SKoolKool 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 SKoolKool or Millennium Problems have ads?

Neither SKoolKool nor Millennium Problems shows ads.

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

SKoolKool ships an update every 10 days, and Millennium Problems every 4 days. Most recently, SKoolKool was updated on October 7, 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.*