# Polyhedron and Polyhedra Vol.2 vs Millennium Problems

The clearest difference is price: Millennium Problems at Free against Polyhedron and Polyhedra Vol.2's $2.99. Millennium Problems also leads on rating (5.0 vs 4.3) and update cadence (every 4 days vs every 28 months). Polyhedron and Polyhedra Vol.2's advantage is ratings volume (3 vs 1) and iOS requirement (13.0 vs 15.0). On ads and in-app purchases there is nothing between them.

Millennium Problems is free to download; Polyhedron and Polyhedra Vol.2 costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Millennium Problems holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Polyhedron and Polyhedra Vol.2 ships an update every 28 months, Millennium Problems every 4 days. The most recent releases landed on October 11, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Polyhedron and Polyhedra Vol.2 | Millennium Problems |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [4.3 (3 ratings)](https://appshunter.io/ios/app/polyhedron-and-polyhedra-vol2/id1073494585/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/millennium-problems/id6761263693/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 28 months | **Every 4 days** |
| Monetization | Paid | **Free** |
| Size | 5 MB | 9 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Masahiko Fukuyama](https://appshunter.io/developer/595177290) | [Loic Fonkam](https://appshunter.io/developer/1884693208) |

## What reviewers say

### Polyhedron and Polyhedra Vol.2

[App page](https://appshunter.io/ios/app/polyhedron-and-polyhedra-vol2/id1073494585)

Explore and learn about complex 3D mathematical solids, including star polyhedra and their compounds. Interact with these abstract shapes through intuitive touch gestures, customize their appearance with various colors and patterns, and view them from any angle.

**Highlights:** Interactive 3D model rotation, zoom, and pan, Toggle visibility of faces and components, Adjustable edge thickness and color, Extensive library of polyhedral compounds, Customizable face color patterns, Access to Wikipedia for related information, Save PNG images of models

**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 Polyhedron and Polyhedra Vol.2 free?

Polyhedron and Polyhedra Vol.2 costs $2.99, with no in-app purchases.

### Is Millennium Problems free?

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

### Which has better reviews, Polyhedron and Polyhedra Vol.2 or Millennium Problems?

Millennium Problems is rated higher. Polyhedron and Polyhedra Vol.2 averages 4.3 out of 5 from 3 ratings, while Millennium Problems averages 5.0 from 1 ratings.

### Do Polyhedron and Polyhedra Vol.2 or Millennium Problems have ads?

Neither Polyhedron and Polyhedra Vol.2 nor Millennium Problems shows ads.

### Which is updated more often, Polyhedron and Polyhedra Vol.2 or Millennium Problems?

Polyhedron and Polyhedra Vol.2 ships an update every 28 months, and Millennium Problems every 4 days. Most recently, Polyhedron and Polyhedra Vol.2 was updated on October 11, 2026 and Millennium Problems on October 9, 2026.

---

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