# Master Plumber Test vs Plumber Prep

The clearest difference is monetization model: Plumber Prep at free with in-app purchases against Master Plumber Test's subscription. Plumber Prep also leads on ratings volume (3 vs 1). Master Plumber Test's advantage is update cadence (every 3 weeks vs every 4 months). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Master Plumber Test sells 2 in-app purchases, starting at $6.99 per month and Plumber Prep sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

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

Master Plumber Test ships an update every 3 weeks, Plumber Prep every 4 months. The most recent releases landed on September 30, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Master Plumber Test | Plumber Prep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/master-plumber-test/id6664061133/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/plumber-prep-pipe-size-calc/id6758053564/reviews) |
| Number of ratings | 1 | **3** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 4 months |
| Monetization | Subscription | **Free with in-app purchases** |
| Size | 11 MB | 9 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Cargo Teleport Inc](https://appshunter.io/developer/1761832181) | [Deeun Inc.](https://appshunter.io/developer/1691824695) |

## What reviewers say

### Master Plumber Test

[App page](https://appshunter.io/ios/app/master-plumber-test/id6664061133)

Prepare for your plumber licensing exams with a comprehensive study tool. It offers extensive practice questions with detailed explanations, custom test creation, and progress tracking for both UPC and IPC codes. Study offline with a user-friendly interface.

**Highlights:** Extensive practice questions, Customizable practice tests, Detailed explanations and references, Plumbing math and calculations, Progress tracking, Up-to-date content, Offline access

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium monthly subscription | $6.99 | per month |
| Lifetime version | $19.99 | one-time |


### Plumber Prep

[App page](https://appshunter.io/ios/app/plumber-prep-pipe-size-calc/id6758053564)

Calculate minimum pipe diameter and access over 500 practice questions for plumbing licensing exams. Study drainage, venting, and water supply systems offline with detailed code references. Track your progress to ensure exam readiness.

**Highlights:** Pipe diameter calculation, 500+ practice questions, IPC & UPC code coverage, Offline study mode, Progress tracking, Reference tables

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plumber Prep Pro Monthly | $6.99 | per month |
| Pro — Lifetime Access | $17.99 | one-time |


## Frequently asked questions

### Is Master Plumber Test free?

Master Plumber Test is free to download, with in-app purchases available.

### Is Plumber Prep free?

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

### Which has better reviews, Master Plumber Test or Plumber Prep?

Master Plumber Test and Plumber Prep are both rated 5.0 out of 5 on the App Store, from 1 and 3 ratings respectively.

### Do Master Plumber Test or Plumber Prep have ads?

Neither Master Plumber Test nor Plumber Prep shows ads.

### Which is updated more often, Master Plumber Test or Plumber Prep?

Master Plumber Test ships an update every 3 weeks, and Plumber Prep every 4 months. Most recently, Master Plumber Test was updated on September 30, 2026 and Plumber Prep on October 5, 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.*