# prepCIE vs Discrete Math

The clearest difference is in-app purchases: prepCIE at none against Discrete Math's 3. Discrete Math's advantage is update cadence (every 3 weeks vs every 5 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Discrete Math sells 3 in-app purchases, starting at $4.99 per 7 days. prepCIE asks for nothing beyond the download.

prepCIE ships an update every 5 months, Discrete Math every 3 weeks. Both last shipped on October 12, 2026.

## The numbers

| Metric | prepCIE | Discrete Math |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Size | 35 MB | 39 MB |
| Requires iOS | **14.0.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bilal Rafi](https://appshunter.io/developer/1709916625) | [Mobin Akhter](https://appshunter.io/developer/1812505286) |

## What reviewers say

### prepCIE

[App page](https://appshunter.io/ios/app/prepcie/id6468444094)

**Features:** macOS Compatibility

**In-app purchases:** none


### Discrete Math

[App page](https://appshunter.io/ios/app/discrete-math-discretica/id6761345113)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $4.99 | per 7 days |
| Yearly Premium | $29.99 | per year |
| Lifetime Premium | $64.99 | one-time |


## Frequently asked questions

### Is prepCIE free?

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

### Is Discrete Math free?

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

### Do prepCIE or Discrete Math have ads?

Neither prepCIE nor Discrete Math shows ads.

### Which is updated more often, prepCIE or Discrete Math?

prepCIE ships an update every 5 months, and Discrete Math every 3 weeks. Most recently, prepCIE was updated on October 12, 2026 and Discrete Math on October 12, 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.*