# Caleffi Pipe Sizer vs Si

The clearest difference is rating: Caleffi Pipe Sizer at 5.0 against Si's 1.0. Caleffi Pipe Sizer also leads on review sentiment (50% vs 33%). Si's advantage is update cadence (every 2 months vs every 7 months). On price, ratings volume, 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 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews point the same way: 50% of Caleffi Pipe Sizer's written reviews are positive against 33% of Si's.

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

## The numbers

| Metric | Caleffi Pipe Sizer | Si |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/caleffi-pipe-sizer/id1088928458/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/si-manifold/id1294563130/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | **50.0% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 44 MB | 87 MB |
| Requires iOS | 13.0 | **12.4** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Caleffi S.p.A](https://appshunter.io/developer/920722440) | [SAUERMANN INDUSTRIE](https://appshunter.io/developer/1169513729) |

## 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


### Si

[App page](https://appshunter.io/ios/app/si-manifold/id1294563130)

Instantly and accurately displays numerous measurements like pressure and temperature for specific devices. It supports long-range Bluetooth connectivity and can store and update approximately 120 refrigerants, including environmentally friendly options.

**Highlights:** Real-time measurement display, Bluetooth 4.2 connectivity (up to 30m), Storage for ~120 refrigerants, Environmentally friendly refrigerant support, Updateable refrigerant database

**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 Si free?

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

### Which has better reviews, Caleffi Pipe Sizer or Si?

Caleffi Pipe Sizer is rated higher. Caleffi Pipe Sizer averages 5.0 out of 5 from 1 ratings, while Si averages 1.0 from 1 ratings.

### Do Caleffi Pipe Sizer or Si have ads?

Neither Caleffi Pipe Sizer nor Si shows ads.

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

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