# CPU8 vs Power Grid Operator Exam Prep

The clearest difference is in-app purchases: CPU8 at none against Power Grid Operator Exam Prep's 1. CPU8 also leads on ratings volume (15 vs 4) and iOS requirement (12.0 vs 26.0). Power Grid Operator Exam Prep's advantage is review sentiment (100% vs 67%) and update cadence (every 5 days vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Power Grid Operator Exam Prep sells 1 one-off in-app purchase. CPU8 asks for nothing beyond the download.

Power Grid Operator Exam Prep holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 15 and 4 respectively. Written reviews point the same way: 67% of CPU8's written reviews are positive against 100% of Power Grid Operator Exam Prep's.

CPU8 ships an update every 3 months, Power Grid Operator Exam Prep every 5 days. The most recent releases landed on November 2, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | CPU8 | Power Grid Operator Exam Prep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (15 ratings)](https://appshunter.io/ios/app/cpu8/id1448776028/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/power-grid-operator-exam-prep/id6814519820/reviews)** |
| Number of ratings | **15** | 4 |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 163 MB | 7 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Cordova Bay Entertainment Group, Inc](https://appshunter.io/developer/1448776027) | [PATRICK ANTHONY RODRIGUES](https://appshunter.io/developer/6806796087) |

## What reviewers say

### CPU8

[App page](https://appshunter.io/ios/app/cpu8/id1448776028)

Explore the inner workings of an 8-bit computer through simulation. Write, assemble, and run programs to understand computer instructions and their relationships with hardware components. Includes an assembler, sample programs, and educational resources.

**Highlights:** 8-bit computer simulator, Built-in assembler with manual, Control clock speed and single-step execution, 16 instructions and 3 pseudo-instructions, 7 sample assembler programs, Links to Ben Eater videos, History of computing content

**Features:** macOS Compatibility

**In-app purchases:** none


### Power Grid Operator Exam Prep

[App page](https://appshunter.io/ios/app/power-grid-operator-exam-prep/id6814519820)

Prepare for NERC certification exams with practice questions, timed mock tests, and a control-room simulator. This trainer covers RC, BT, TO, and BI credentials, offering scored assessments against cut scores and detailed debriefs.

**Highlights:** 1,224 original practice questions, Timed mock exam papers, Control-room simulator with scenarios, Scored against NERC cut scores, Covers RC, BT, TO, and BI credentials, Progress tracking and readiness estimates

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $24.99 | one-time |


## Frequently asked questions

### Is CPU8 free?

CPU8 is free to download, with no in-app purchases.

### Is Power Grid Operator Exam Prep free?

Power Grid Operator Exam Prep is free to download, with in-app purchases available.

### Which has better reviews, CPU8 or Power Grid Operator Exam Prep?

Power Grid Operator Exam Prep is rated higher. CPU8 averages 4.7 out of 5 from 15 ratings, while Power Grid Operator Exam Prep averages 5.0 from 4 ratings.

### Do CPU8 or Power Grid Operator Exam Prep have ads?

Neither CPU8 nor Power Grid Operator Exam Prep shows ads.

### Which is updated more often, CPU8 or Power Grid Operator Exam Prep?

CPU8 ships an update every 3 months, and Power Grid Operator Exam Prep every 5 days. Most recently, CPU8 was updated on November 2, 2026 and Power Grid Operator Exam Prep on November 13, 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.*