# Mathematics 3rd grade vs Plumber Prep

The clearest difference is in-app purchases: Mathematics 3rd grade at none against Plumber Prep's 2. Mathematics 3rd grade also leads on device support (3 vs 1) and iOS requirement (8.0 vs 17.0). On price and ads there is nothing between them.

Both are free to download. Plumber Prep sells 2 in-app purchases, starting at $6.99 per month. Mathematics 3rd grade asks for nothing beyond the download.

## The numbers

| Metric | Mathematics 3rd grade | Plumber Prep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/plumber-prep-pipe-size-calc/id6758053564/reviews)** |
| Number of ratings | — | **4** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 4 months |
| Monetization | — | Free with in-app purchases |
| Size | 28 MB | 9 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sergey Novikov](https://appshunter.io/developer/1071695878) | [Deeun Inc.](https://appshunter.io/developer/1691824695) |

## What reviewers say

### Mathematics 3rd grade

[App page](https://appshunter.io/ios/app/mathematics-3rd-grade/id1467565940)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Mathematics 3rd grade free?

Mathematics 3rd grade is free to download, with no in-app purchases.

### Is Plumber Prep free?

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

### Do Mathematics 3rd grade or Plumber Prep have ads?

Neither Mathematics 3rd grade nor Plumber Prep 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.*