# Basic Wastewater Operator Prep vs Gauge

The clearest difference is iOS requirement: Basic Wastewater Operator Prep at 13.0 against Gauge's 17.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Basic Wastewater Operator Prep sells 3 in-app purchases, starting at $6.99 per 7 days and Gauge sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Basic Wastewater Operator Prep | Gauge |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | — | Every 2 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 29 MB | 9 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [fly sky pty ltd](https://appshunter.io/developer/1838696534) | [OMAR DANIEL GRAZIANO](https://appshunter.io/developer/1896485759) |

## What reviewers say

### Basic Wastewater Operator Prep

[App page](https://appshunter.io/ios/app/basic-wastewater-operator-prep/id6784085292)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Wastewater Full Access | $6.99 | per 7 days |
| Basic Wastewater Full Access | $16.99 | per month |
| Basic Wastewater Lifetime | $69.99 | one-time |


### Gauge

[App page](https://appshunter.io/ios/app/gauge-water-operator-prep/id6803531173)

Prepare for wastewater operator certification exams with a focus on the math section. This app offers free calculators for essential formulas and provides step-by-step solutions to common mistakes. Practice with timed exams that mirror the actual test format and weighting.

**Highlights:** Free operator math calculators, Step-by-step worked solutions, Timed practice exams, Formula selection drills, Offline functionality, Exam blueprint adherence

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Unlock | $14.99 | one-time |


## Frequently asked questions

### Is Basic Wastewater Operator Prep free?

Basic Wastewater Operator Prep is free to download, with in-app purchases available.

### Is Gauge free?

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

### Do Basic Wastewater Operator Prep or Gauge have ads?

Neither Basic Wastewater Operator Prep nor Gauge 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.*