# Environmental Engineering Quiz vs Wastewater Operator Test Prep

The clearest difference is in-app purchases: Wastewater Operator Test Prep at none against Environmental Engineering Quiz's 6. Wastewater Operator Test Prep also leads on update cadence (monthly vs every 3 months) and iOS requirement (15.1 vs 17.0). Environmental Engineering Quiz's advantage is ratings volume (3 vs 1). On price, rating, ads and device support there is nothing between them.

Both are free to download. Environmental Engineering Quiz sells 6 in-app purchases, starting at $9.99 per month. Wastewater Operator Test Prep asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Environmental Engineering Quiz against 5.0 for Wastewater Operator Test Prep. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Environmental Engineering Quiz ships an update every 3 months, Wastewater Operator Test Prep monthly. The most recent releases landed on October 21, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Environmental Engineering Quiz | Wastewater Operator Test Prep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/environmental-engineering-quiz/id6739960303/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/wastewater-operator-test-prep/id6761349297/reviews) |
| Number of ratings | **3** | 1 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 23 MB | 28 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) | [Mike Watson](https://appshunter.io/developer/1848411021) |

## What reviewers say

### Environmental Engineering Quiz

[App page](https://appshunter.io/ios/app/environmental-engineering-quiz/id6739960303)

Master environmental engineering concepts with engaging quizzes covering wastewater treatment, air pollution, and more. Features timed challenges, practice modes, detailed analytics, and offline access. Ideal for students and professionals seeking to enhance their knowledge.

**Highlights:** Comprehensive topic coverage, Expert-designed challenging questions, Real-time feedback and explanations, Multiple quiz modes, Detailed progress analytics, Offline access

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month | $9.99 | per month |
| 6 Months | $19.99 | per 6 months |
| 1 Year | $29.99 | per year |
| 1500 | $0.99 | one-time |
| 3500 | $1.99 | one-time |
| 9000 | $3.99 | one-time |


### Wastewater Operator Test Prep

[App page](https://appshunter.io/ios/app/wastewater-operator-test-prep/id6761349297)

This professional calculator provides 16 essential wastewater treatment calculations for licensed operators, covering Class I through Class IV certification math. It displays formulas and substituted values for easy verification and works completely offline, making it ideal for field use.

**Highlights:** 16 essential wastewater calculations, Supports Class I-IV certification math, Shows formulas and substituted values, Works 100% offline, Large, readable results for field use, Copy result for sharing, Calculation history

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

**In-app purchases:** none


## Frequently asked questions

### Is Environmental Engineering Quiz free?

Environmental Engineering Quiz is free to download, with in-app purchases available.

### Is Wastewater Operator Test Prep free?

Wastewater Operator Test Prep is free to download, with no in-app purchases.

### Which has better reviews, Environmental Engineering Quiz or Wastewater Operator Test Prep?

Environmental Engineering Quiz and Wastewater Operator Test Prep are both rated 5.0 out of 5 on the App Store, from 3 and 1 ratings respectively.

### Do Environmental Engineering Quiz or Wastewater Operator Test Prep have ads?

Neither Environmental Engineering Quiz nor Wastewater Operator Test Prep shows ads.

### Which is updated more often, Environmental Engineering Quiz or Wastewater Operator Test Prep?

Environmental Engineering Quiz ships an update every 3 months, and Wastewater Operator Test Prep monthly. Most recently, Environmental Engineering Quiz was updated on October 21, 2026 and Wastewater Operator Test Prep on October 9, 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.*