# USTeP vs Carl App Pro

The clearest difference is in-app purchases: USTeP at none against Carl App Pro's 13. Carl App Pro's advantage is update cadence (every 3 weeks vs every 17 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Carl App Pro sells 13 one-off in-app purchases. USTeP asks for nothing beyond the download.

USTeP ships an update every 17 months, Carl App Pro every 3 weeks. The most recent releases landed on October 19, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | USTeP | Carl App Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 3 weeks** |
| Size | 58 MB | 19 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [USTP Digital Transformation](https://appshunter.io/developer/1717593851) | [Cake Venture Technologies, Inc.](https://appshunter.io/developer/1775035685) |

## What reviewers say

### USTeP

[App page](https://appshunter.io/ios/app/ustep/id6472714715)

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

**In-app purchases:** none


### Carl App Pro

[App page](https://appshunter.io/ios/app/carl-app-pro/id6752743059)

**Features:** macOS Compatibility

**In-app purchases (13)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Majorship: CAED | $1.99 | one-time |
| Majorship: BEED | $1.99 | one-time |
| Majorship: TLETVTED | $1.99 | one-time |
| Majorship: English | $1.99 | one-time |
| Majorship: Filipino | $1.99 | one-time |
| Majorship: Math | $1.99 | one-time |
| Majorship: Values Ed | $1.99 | one-time |
| Majorship: Science | $1.99 | one-time |
| Majorship: Social Science | $1.99 | one-time |
| Quiz(10)+Mock(150) Subject | $1.99 | one-time |
| Carl AI + Download | $1.99 | one-time |
| Majorship Subject (One-Time) | $1.99 | one-time |
| Gen Ed + Prof Ed (Bundle) | $2.99 | one-time |


## Frequently asked questions

### Is USTeP free?

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

### Is Carl App Pro free?

Carl App Pro is free to download, with in-app purchases available.

### Do USTeP or Carl App Pro have ads?

Neither USTeP nor Carl App Pro shows ads.

### Which is updated more often, USTeP or Carl App Pro?

USTeP ships an update every 17 months, and Carl App Pro every 3 weeks. Most recently, USTeP was updated on October 19, 2026 and Carl App Pro on October 16, 2026.

---

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