# Pipe Trades Pro Calc vs MachBackflow

The clearest difference is review sentiment: MachBackflow at 100% against Pipe Trades Pro Calc's 43%. MachBackflow also leads on update cadence (every 2 months vs every 7 months) and rating (5.0 vs 4.8). Pipe Trades Pro Calc's advantage is ratings volume (4.3K vs 2) and chart position (#153 vs unranked). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Pipe Trades Pro Calc sells 2 in-app purchases, starting at $4.99 per month and MachBackflow sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

MachBackflow holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Pipe Trades Pro Calc has 4.3K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 43% of Pipe Trades Pro Calc's written reviews are positive against 100% of MachBackflow's.

Pipe Trades Pro Calc ships an update every 7 months, MachBackflow every 2 months. The most recent releases landed on October 20, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Pipe Trades Pro Calc | MachBackflow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (4.3K ratings)](https://appshunter.io/ios/app/pipe-trades-pro-calc/id596142100/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/machbackflow/id6448785820/reviews)** |
| Number of ratings | **4.3K** | 2 |
| Positive reviews | 42.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 months** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#153** | — |
| Size | 51 MB | 18 MB |
| Requires iOS | **14.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Calculated Industries](https://appshunter.io/developer/370406449) | [WTM Solutions, LLC](https://appshunter.io/developer/1673242880) |

## What reviewers say

### Pipe Trades Pro Calc

[App page](https://appshunter.io/ios/app/pipe-trades-pro-calc/id596142100)

**Currently charting:** #153 Top Grossing · Utilities (US App Store)

This app provides advanced calculation tools and comprehensive data for pipe trade professionals. It streamlines workflows for pipefitters, welders, and steamfitters with features for measurements, fluid dynamics, and material specifications. Designed for efficiency and accuracy, it works offline for on-site use.

**Highlights:** Advanced measurement calculations, Fluid dynamics and pressure analysis, Comprehensive pipe data access, Offline functionality, User-centric interface, Material and dimension options

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Full Access | $4.99 | per month |
| 1 Year Full Access | $39.99 | per year |

**What reviewers like**

- 🔢 Useful calculator tool
- 🧠 Helpful for pipe fitters and welders
- 📱 Convenient to have on mobile device
- 🔍 Accurate calculations

**What reviewers complain about**

- 💰 Subscription model is too expensive
- 🔒 Requires internet connection to verify subscription
- 🔄 Used to be a one-time purchase
- 🤔 Confusing transition from one-time to subscription

**Reported bugs**

- App freezes or stops working after updates
- Calculation errors with fractions
- Issues with reinstalling or transferring purchases

**Requested features**

- Ability to use app without subscription
- Support for larger pipe sizes
- Add a back/undo button
- Rotate screen orientation


### 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 |


## Frequently asked questions

### Is Pipe Trades Pro Calc free?

Pipe Trades Pro Calc is free to download, with in-app purchases available.

### Is MachBackflow free?

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

### Which has better reviews, Pipe Trades Pro Calc or MachBackflow?

MachBackflow is rated higher. Pipe Trades Pro Calc averages 4.8 out of 5 from 4.3K ratings, while MachBackflow averages 5.0 from 2 ratings.

### Do Pipe Trades Pro Calc or MachBackflow have ads?

Neither Pipe Trades Pro Calc nor MachBackflow shows ads.

### Which is updated more often, Pipe Trades Pro Calc or MachBackflow?

Pipe Trades Pro Calc ships an update every 7 months, and MachBackflow every 2 months. Most recently, Pipe Trades Pro Calc was updated on October 20, 2026 and MachBackflow on September 18, 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.*