# Curio vs Millennium Problems

The clearest difference is iOS requirement: Millennium Problems at 15.0 against Curio's 18.0. On price, rating, ratings volume and update cadence there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Curio against 5.0 for Millennium Problems. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Both ship on a similar rhythm, roughly every 4 days. Both last shipped on October 9, 2026.

## The numbers

| Metric | Curio | Millennium Problems |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/curio-learn-anything/id6760644187/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/millennium-problems/id6761263693/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 days | Every 4 days |
| Monetization | Free | Free |
| Size | 6 MB | 9 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Gopal Bagaswar](https://appshunter.io/developer/1885477880) | [Loic Fonkam](https://appshunter.io/developer/1884693208) |

## What reviewers say

### Curio

[App page](https://appshunter.io/ios/app/curio-learn-anything/id6760644187)

This app uses AI to create personalized, day-by-day learning paths for any subject. It offers structured curricula, quizzes, flashcards, and progress tracking to help users master new skills efficiently. Learn coding, music, languages, and more with a clear roadmap from beginner to expert.

**Highlights:** AI-generated personalized curricula, Day-by-day learning plans, Spaced repetition flashcards, Quizzes and active recall, Gamified progress tracking (XP, streaks, levels), Multiple learning realms, Focus tools and study tracking

**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 Curio free?

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

### Is Millennium Problems free?

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

### Which has better reviews, Curio or Millennium Problems?

Curio and Millennium Problems are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Curio or Millennium Problems have ads?

Neither Curio nor Millennium Problems shows ads.

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

Curio ships an update every 4 days, and Millennium Problems every 4 days. Most recently, Curio was updated on October 9, 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.*