# CalculusAPex vs SAT Smart Prep

The clearest difference is ads: CalculusAPex at none against SAT Smart Prep's shown. SAT Smart Prep's advantage is device support (4 vs 2) and iOS requirement (13.0 vs 26.2). On price, update cadence and in-app purchases there is nothing between them.

Both are free to download. CalculusAPex sells 1 one-off in-app purchase and SAT Smart Prep sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

CalculusAPex ships an update every 2 months, SAT Smart Prep every 6 weeks. The most recent releases landed on September 21, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | CalculusAPex | SAT Smart Prep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Size | 9 MB | 113 MB |
| Requires iOS | 26.2 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [JT Scientific Consulting LLC](https://appshunter.io/developer/1612699648) | [Hoa Nguyen Quang](https://appshunter.io/developer/1434185665) |

## What reviewers say

### CalculusAPex

[App page](https://appshunter.io/ios/app/calculusapex-ap-cal-prep/id6760131058)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CalculusAPex Premium | $39.99 | one-time |


### SAT Smart Prep

[App page](https://appshunter.io/ios/app/sat-smart-prep/id6779995945)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove all ads | $4.99 | one-time |


## Frequently asked questions

### Is CalculusAPex free?

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

### Is SAT Smart Prep free?

SAT Smart Prep is free to download, with in-app purchases available.

### Do CalculusAPex or SAT Smart Prep have ads?

SAT Smart Prep shows ads; CalculusAPex does not.

### Which is updated more often, CalculusAPex or SAT Smart Prep?

CalculusAPex ships an update every 2 months, and SAT Smart Prep every 6 weeks. Most recently, CalculusAPex was updated on September 21, 2026 and SAT Smart Prep on September 17, 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.*