# MachBackflow vs Gas Pipe Sizing Plumb

The clearest difference is price: MachBackflow at Free against Gas Pipe Sizing Plumb's $0.99. Gas Pipe Sizing Plumb's advantage is update cadence (every 3 weeks vs every 2 months) and device support (3 vs 1). On ads and in-app purchases there is nothing between them.

MachBackflow is free to download; Gas Pipe Sizing Plumb costs $0.99 up front. MachBackflow sells 3 one-off in-app purchases and Gas Pipe Sizing Plumb sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

MachBackflow ships an update every 2 months, Gas Pipe Sizing Plumb every 3 weeks. The most recent releases landed on September 18, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | MachBackflow | Gas Pipe Sizing Plumb |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/machbackflow/id6448785820/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 18 MB | 33 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [WTM Solutions, LLC](https://appshunter.io/developer/1673242880) | [Rizvan Adzhoian](https://appshunter.io/developer/1891746079) |

## What reviewers say

### MachBackflow

[App page](https://appshunter.io/ios/app/machbackflow/id6448785820)

This app streamlines backflow prevention assembly testing by capturing real-time pressure readings or allowing manual entry. It automatically generates accurate reports and manages all your tests efficiently from the field.

**Highlights:** Real-time pressure capture, Supports all assembly types and procedures, Autofill property and assembly information, Accurate, error-free PDF reports, Cloud synchronization, Powerful search and filters

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Credits 10 | $24.99 | one-time |
| Credits 100 | $174.99 | one-time |
| Credits 250 | $299.99 | one-time |


### Gas Pipe Sizing Plumb

[App page](https://appshunter.io/ios/app/gas-pipe-sizing-plumb/id6765783516)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |


## Frequently asked questions

### Is MachBackflow free?

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

### Is Gas Pipe Sizing Plumb free?

Gas Pipe Sizing Plumb costs $0.99, and also offers in-app purchases.

### Do MachBackflow or Gas Pipe Sizing Plumb have ads?

Neither MachBackflow nor Gas Pipe Sizing Plumb shows ads.

### Which is updated more often, MachBackflow or Gas Pipe Sizing Plumb?

MachBackflow ships an update every 2 months, and Gas Pipe Sizing Plumb every 3 weeks. Most recently, MachBackflow was updated on September 18, 2026 and Gas Pipe Sizing Plumb 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.*