# Plumbing Formulator vs PDF Masters Pro

The clearest difference is update cadence: PDF Masters Pro at every 3 weeks against Plumbing Formulator's every 2 months. PDF Masters Pro also leads on iOS requirement (16.0 vs 18.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Plumbing Formulator sells 4 one-off in-app purchases and PDF Masters Pro sells 1 in-app purchase, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Plumbing Formulator ships an update every 2 months, PDF Masters Pro every 3 weeks. Both last shipped on October 31, 2026.

## The numbers

| Metric | Plumbing Formulator | PDF Masters Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (7 ratings)](https://appshunter.io/ios/app/plumbing-formulator/id303497783/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 9.1% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 123 MB | 11 MB |
| Requires iOS | 18.6 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Aman Kumar](https://appshunter.io/developer/1890812511) |

## What reviewers say

### Plumbing Formulator

[App page](https://appshunter.io/ios/app/plumbing-formulator/id303497783)

This professional calculator app provides over 200 formulas, calculators, and reference materials for plumbers, HVAC technicians, and mechanical contractors. It covers a wide range of calculations for water flow, piping, drainage, water heaters, pumps, and more, all in one pocket-sized tool.

**Highlights:** Over 200 formulas and calculators, Water flow and supply calculations, Pipe and piping calculations, Drainage and venting calculations, Water heater and pump calculations, Reference charts and code books, Pipe cut list optimizer

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $1.99 | one-time |
| Pro Purchase | $3.99 | one-time |
| Starter | $5.99 | one-time |
| Growth | $9.99 | one-time |


### PDF Masters Pro

[App page](https://appshunter.io/ios/app/pdf-masters-pro-pdf-scanner/id6776615624)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $4.99 | per month |


## Frequently asked questions

### Is Plumbing Formulator free?

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

### Is PDF Masters Pro free?

PDF Masters Pro is free to download, with in-app purchases available.

### Do Plumbing Formulator or PDF Masters Pro have ads?

Neither Plumbing Formulator nor PDF Masters Pro shows ads.

### Which is updated more often, Plumbing Formulator or PDF Masters Pro?

Plumbing Formulator ships an update every 2 months, and PDF Masters Pro every 3 weeks. Most recently, Plumbing Formulator was updated on October 31, 2026 and PDF Masters Pro on October 31, 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.*