# Plumbing Formulator vs Caleffi Pipe Sizer

The clearest difference is review sentiment: Caleffi Pipe Sizer at 50% against Plumbing Formulator's 9%. Caleffi Pipe Sizer also leads on in-app purchases (none vs 4) and rating (5.0 vs 4.6). Plumbing Formulator's advantage is update cadence (every 2 months vs every 7 months) and ratings volume (7 vs 1). On price, ads, monetization model and device support there is nothing between them.

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

Caleffi Pipe Sizer holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Plumbing Formulator has 7 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 9% of Plumbing Formulator's written reviews are positive against 50% of Caleffi Pipe Sizer's.

Plumbing Formulator ships an update every 2 months, Caleffi Pipe Sizer every 7 months. The most recent releases landed on October 6, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Plumbing Formulator | Caleffi Pipe Sizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (7 ratings)](https://appshunter.io/ios/app/plumbing-formulator/id303497783/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/caleffi-pipe-sizer/id1088928458/reviews)** |
| Number of ratings | **7** | 1 |
| Positive reviews | 9.1% of reviews | **50.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 7 months |
| Monetization | Free | Free |
| Size | 123 MB | 44 MB |
| Requires iOS | 18.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Caleffi S.p.A](https://appshunter.io/developer/920722440) |

## 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 |


### Caleffi Pipe Sizer

[App page](https://appshunter.io/ios/app/caleffi-pipe-sizer/id1088928458)

This application assists hydraulic and HVAC professionals in accurately sizing water or air pipes. It calculates pressure drops and offers a modern, intuitive interface for precise system design on the go.

**Highlights:** Accurate water/air pipe sizing, Pressure drop calculation, Customizable technical parameter calculations, Extensive material and configuration library, Modern and intuitive interface, Enhanced performance

**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 Caleffi Pipe Sizer free?

Caleffi Pipe Sizer is free to download, with no in-app purchases.

### Which has better reviews, Plumbing Formulator or Caleffi Pipe Sizer?

Caleffi Pipe Sizer is rated higher. Plumbing Formulator averages 4.6 out of 5 from 7 ratings, while Caleffi Pipe Sizer averages 5.0 from 1 ratings.

### Do Plumbing Formulator or Caleffi Pipe Sizer have ads?

Neither Plumbing Formulator nor Caleffi Pipe Sizer shows ads.

### Which is updated more often, Plumbing Formulator or Caleffi Pipe Sizer?

Plumbing Formulator ships an update every 2 months, and Caleffi Pipe Sizer every 7 months. Most recently, Plumbing Formulator was updated on October 6, 2026 and Caleffi Pipe Sizer on October 2, 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.*