# Primo vs How Math Works

The clearest difference is update cadence: How Math Works at every 6 days against Primo's monthly. Primo's advantage is iOS requirement (12.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Primo sells 9 in-app purchases, starting at $3.49 per month and How Math Works sells 1 in-app purchase, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Primo ships an update monthly, How Math Works every 6 days. The most recent releases landed on June 1, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Primo | How Math Works |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 6 days** |
| Monetization | Free with in-app purchases | — |
| Size | 258 MB | 29 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [INTERNATIONAL LABORATORY OF MUSIC EDUCATION](https://appshunter.io/developer/1493879437) | [Tsuyoshi Chujo](https://appshunter.io/developer/1481316741) |

## What reviewers say

### Primo

[App page](https://appshunter.io/ios/app/primo/id1493879438)

This app offers dailyソルフェージュ exercises to build fundamental music skills like reading sheet music, identifying pitches by ear, and understanding rhythm. It aims to make music education accessible and affordable for everyone, regardless of location or prior experience.

**Highlights:** Sheet music reading practice, Ear training exercises, Rhythm and timing drills, Sight-reading simulations, Music history and appreciation content, Specialized theory problem collections

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 読譜（どくふ） | $3.49 | per month |
| 初見（しょけん） | $3.49 | per month |
| リズム | $3.49 | per month |
| 聴音（ちょうおん） | $3.49 | per month |
| まとめ買い | $13.99 | per month |
| シュトラウス | $0.99 | one-time |
| 山田耕筰 | $0.99 | one-time |
| ドビュッシー | $0.99 | one-time |
| シベリウス | $0.99 | one-time |


### How Math Works

[App page](https://appshunter.io/ios/app/how-math-works/id6787864882)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plan (Monthly) | $3.99 | per month |


## Frequently asked questions

### Is Primo free?

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

### Is How Math Works free?

How Math Works is free to download, with in-app purchases available.

### Do Primo or How Math Works have ads?

Neither Primo nor How Math Works shows ads.

### Which is updated more often, Primo or How Math Works?

Primo ships an update monthly, and How Math Works every 6 days. Most recently, Primo was updated on June 1, 2026 and How Math Works on September 23, 2026.

---

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