# Caleffi Pipe Sizer vs ASHRAE 365

The clearest difference is review sentiment: Caleffi Pipe Sizer at 50% against ASHRAE 365's 0%. Caleffi Pipe Sizer also leads on rating (5.0 vs 4.2) and monetization model (free vs ad-supported). ASHRAE 365's advantage is ratings volume (10 vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Caleffi Pipe Sizer holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: ASHRAE 365 has 10 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of Caleffi Pipe Sizer's written reviews are positive against 0% of ASHRAE 365's.

Caleffi Pipe Sizer ships an update every 7 months, ASHRAE 365 every 4 months. The most recent releases landed on October 2, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Caleffi Pipe Sizer | ASHRAE 365 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/caleffi-pipe-sizer/id1088928458/reviews)** | [4.2 (10 ratings)](https://appshunter.io/ios/app/ashrae-365/id1337759799/reviews) |
| Number of ratings | 1 | **10** |
| Positive reviews | **50.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 4 months** |
| Monetization | **Free** | Ad-supported |
| Size | 44 MB | 53 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Caleffi S.p.A](https://appshunter.io/developer/920722440) | [ASHRAE, Inc.](https://appshunter.io/developer/375374912) |

## What reviewers say

### 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


### ASHRAE 365

[App page](https://appshunter.io/ios/app/ashrae-365/id1337759799)

Access ASHRAE information year-round. Stay updated on global conferences and events, connect with the community via social media, and discover resources to support the Society.

**Highlights:** Conference and event updates, Social media integration, Resource discovery, Society support information, Year-round access

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Caleffi Pipe Sizer free?

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

### Is ASHRAE 365 free?

ASHRAE 365 is free to download, with no in-app purchases.

### Which has better reviews, Caleffi Pipe Sizer or ASHRAE 365?

Caleffi Pipe Sizer is rated higher. Caleffi Pipe Sizer averages 5.0 out of 5 from 1 ratings, while ASHRAE 365 averages 4.2 from 10 ratings.

### Do Caleffi Pipe Sizer or ASHRAE 365 have ads?

Neither Caleffi Pipe Sizer nor ASHRAE 365 shows ads.

### Which is updated more often, Caleffi Pipe Sizer or ASHRAE 365?

Caleffi Pipe Sizer ships an update every 7 months, and ASHRAE 365 every 4 months. Most recently, Caleffi Pipe Sizer was updated on October 2, 2026 and ASHRAE 365 on October 6, 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.*