# Plumbing Formulator vs JMAC Driver

The clearest difference is in-app purchases: JMAC Driver at none against Plumbing Formulator's 4. JMAC Driver also leads on iOS requirement (15.6 vs 18.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Plumbing Formulator sells 4 one-off in-app purchases. JMAC Driver asks for nothing beyond the download.

Plumbing Formulator ships an update every 2 months, JMAC Driver every 6 weeks. The most recent releases landed on September 26, 2026 and May 18, 2026 respectively.

## The numbers

| Metric | Plumbing Formulator | JMAC Driver |
| --- | --- | --- |
| 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 | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 123 MB | 36 MB |
| Requires iOS | 18.6 | **15.6** |
| Devices | **iPhone, iPad** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [J.P. McMahon Leasing, LLC](https://appshunter.io/developer/1436484777) |

## 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 |


### JMAC Driver

[App page](https://appshunter.io/ios/app/jmac-driver/id1606198767)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Plumbing Formulator free?

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

### Is JMAC Driver free?

JMAC Driver is free to download, with no in-app purchases.

### Do Plumbing Formulator or JMAC Driver have ads?

Neither Plumbing Formulator nor JMAC Driver shows ads.

### Which is updated more often, Plumbing Formulator or JMAC Driver?

Plumbing Formulator ships an update every 2 months, and JMAC Driver every 6 weeks. Most recently, Plumbing Formulator was updated on September 26, 2026 and JMAC Driver on May 18, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*