# IPST Bio vs Math 24

The clearest difference is in-app purchases: IPST Bio at none against Math 24's 4. IPST Bio also leads on ads (none vs shown) and iOS requirement (6.0 vs 10.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Math 24 sells 4 one-off in-app purchases. IPST Bio asks for nothing beyond the download.

IPST Bio ships an update monthly, Math 24 every 6 weeks. The most recent releases landed on October 4, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | IPST Bio | Math 24 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (2.2K ratings)](https://appshunter.io/ios/app/math-24-mental-math-cards/id1274499822/reviews)** |
| Number of ratings | — | **2.2K** |
| Positive reviews | — | 75.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 6 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 279 MB | 33 MB |
| Requires iOS | **6.0** | 10.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [The Institute for the Promotion of Teaching Science and Technology (IPST)](https://appshunter.io/developer/643591471) | [Peikun Duan](https://appshunter.io/developer/1240254007) |

## What reviewers say

### IPST Bio

[App page](https://appshunter.io/ios/app/ipst-bio/id1169409440)

**Features:** macOS Compatibility

**In-app purchases:** none


### Math 24

[App page](https://appshunter.io/ios/app/math-24-mental-math-cards/id1274499822)

This app offers a classic arithmetic puzzle where players combine four numbers using basic operations to reach 24. It features progressive difficulty levels, a timed challenge mode, and integration with Game Center for leaderboards and achievements.

**Highlights:** Combine four numbers to make 24, Addition, subtraction, multiplication, division, Stage mode with 300 levels, Speed mode for timed challenges, Game Center leaderboards and achievements, Help button for difficult questions

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 12 Tips | $1.39 | one-time |
| Remove Ads | $2.39 | one-time |
| 20 Tips | $2.39 | one-time |
| 20 Tips + Remove Ads | $3.99 | one-time |

**What reviewers like**

- 🚀 Fun and challenging
- 👍 Helps improve math skills
- 👍 Great brain training
- 👍 Convenient and accessible

**What reviewers complain about**

- 🙄 Too many ads
- 🐛 Bugs and issues with ads
- 🙄 Levels too difficult

**Reported bugs**

- Incorrect solutions provided
- Ads not working properly
- Syncing issues across devices

**Requested features**

- Add negative numbers and more features
- Option to favorite/save questions
- Difficulty levels (easy, medium, hard)


## Frequently asked questions

### Is IPST Bio free?

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

### Is Math 24 free?

Math 24 is free to download, with in-app purchases available.

### Do IPST Bio or Math 24 have ads?

Math 24 shows ads; IPST Bio does not.

### Which is updated more often, IPST Bio or Math 24?

IPST Bio ships an update monthly, and Math 24 every 6 weeks. Most recently, IPST Bio was updated on October 4, 2026 and Math 24 on October 26, 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.*