# PE1 Exam Pro vs Calculus Formulas

PE1 Exam Pro and Calculus Formulas are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. PE1 Exam Pro sells 10 in-app purchases, starting at $39.99 per month and Calculus Formulas sells 3 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | PE1 Exam Pro | Calculus Formulas |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Size | 9 MB | 48 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [David Reddick](https://appshunter.io/developer/1885919293) | [Mobin Akhter](https://appshunter.io/developer/1812505286) |

## What reviewers say

### PE1 Exam Pro

[App page](https://appshunter.io/ios/app/pe1-exam-pro-power-engineer/id6760731000)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PE1 1B2 – Monthly | $39.99 | per month |
| PE1 1B3 – Monthly | $39.99 | per month |
| PE1 1B4 – Monthly | $39.99 | per month |
| PE1 1B2 – 3 Month | $499.99 | per 3 months |
| PE1 1B4 – 3 Month | $499.99 | per 3 months |
| PE1 1B3 – 3 Month | $499.99 | per 3 months |
| PE1 1B1 – 6 Month | $699.99 | per 6 months |
| PE1 1B2 – 6 Month | $699.99 | per 6 months |
| PE1 1B3 – 6 Month | $699.99 | per 6 months |
| PE1 1B4 – 6 Month | $699.99 | per 6 months |


### Calculus Formulas

[App page](https://appshunter.io/ios/app/calculus-formulas-calcref/id6761394165)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $4.99 | per 7 days |
| CalcRef Yearly Premium | $44.99 | per year |
| CalcRef Premium Lifetime | $74.99 | one-time |


## Frequently asked questions

### Is PE1 Exam Pro free?

PE1 Exam Pro is free to download, with in-app purchases available.

### Is Calculus Formulas free?

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

### Do PE1 Exam Pro or Calculus Formulas have ads?

Neither PE1 Exam Pro nor Calculus Formulas shows ads.

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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.*