# Millennium Problems vs QuantDojo

The clearest difference is in-app purchases: Millennium Problems at none against QuantDojo's 3. Millennium Problems also leads on iOS requirement (15.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. QuantDojo sells 3 in-app purchases, starting at $12.99 per month. Millennium Problems asks for nothing beyond the download.

## The numbers

| Metric | Millennium Problems | QuantDojo |
| --- | --- | --- |
| 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** | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | — |
| Monetization | Free | — |
| Size | 9 MB | 3 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Loic Fonkam](https://appshunter.io/developer/1884693208) | [Elias Lindbergs](https://appshunter.io/developer/1885362319) |

## What reviewers say

### 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


### QuantDojo

[App page](https://appshunter.io/ios/app/quantdojo/id6761349180)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $12.99 | per month |
| Annual | $79.99 | per year |
| Lifetime Access | $199.99 | one-time |


## Frequently asked questions

### Is Millennium Problems free?

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

### Is QuantDojo free?

QuantDojo is free to download, with in-app purchases available.

### Do Millennium Problems or QuantDojo have ads?

Neither Millennium Problems nor QuantDojo shows ads.

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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.*