# Simple Power Calculator PRO vs CISA Systems Auditor Prep

The clearest difference is price: CISA Systems Auditor Prep at Free against Simple Power Calculator PRO's $1.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

CISA Systems Auditor Prep is free to download; Simple Power Calculator PRO costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Simple Power Calculator PRO ships an update monthly, CISA Systems Auditor Prep every 6 weeks. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Simple Power Calculator PRO | CISA Systems Auditor Prep |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 6 weeks |
| Size | 180 MB | 27 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) | [Davy Raitt](https://appshunter.io/developer/1795318281) |

## What reviewers say

### Simple Power Calculator PRO

[App page](https://appshunter.io/ios/app/simple-power-calculator-pro/id1626489334)

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

**In-app purchases:** none


### CISA Systems Auditor Prep

[App page](https://appshunter.io/ios/app/cisa-systems-auditor-prep/id6757492767)

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

**In-app purchases:** none


## Frequently asked questions

### Is Simple Power Calculator PRO free?

Simple Power Calculator PRO costs $1.99, with no in-app purchases.

### Is CISA Systems Auditor Prep free?

CISA Systems Auditor Prep is free to download, with no in-app purchases.

### Do Simple Power Calculator PRO or CISA Systems Auditor Prep have ads?

Neither Simple Power Calculator PRO nor CISA Systems Auditor Prep shows ads.

### Which is updated more often, Simple Power Calculator PRO or CISA Systems Auditor Prep?

Simple Power Calculator PRO ships an update monthly, and CISA Systems Auditor Prep every 6 weeks. Most recently, Simple Power Calculator PRO was updated on October 30, 2026 and CISA Systems Auditor Prep on October 28, 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.*