# Oventrop vs Caleffi Pipe Sizer

The clearest difference is update cadence: Oventrop at monthly against Caleffi Pipe Sizer's every 7 months. Caleffi Pipe Sizer's advantage is iOS requirement (13.0 vs 15.6). On price, rating, review sentiment and ratings volume there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Oventrop against 5.0 for Caleffi Pipe Sizer. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews are what separate them: 44% of Oventrop's written reviews are positive against 50% of Caleffi Pipe Sizer's.

Oventrop ships an update monthly, Caleffi Pipe Sizer every 7 months. The most recent releases landed on September 10, 2026 and June 25, 2026 respectively.

## The numbers

| Metric | Oventrop | Caleffi Pipe Sizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/oventrop/id396320655/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/caleffi-pipe-sizer/id1088928458/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 44.4% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 7 months |
| Monetization | Free | Free |
| Size | 48 MB | 44 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Oventrop GmbH & Co. KG](https://appshunter.io/developer/396298549) | [Caleffi S.p.A](https://appshunter.io/developer/920722440) |

## What reviewers say

### Oventrop

[App page](https://appshunter.io/ios/app/oventrop/id396320655)

This app assists with the design, calculation, and documentation of hydronic balancing for heating systems. It supports various standards and regulations, enabling users to calculate valve presets, heating loads, and radiator sizes. Documentation can be generated in PDF format or printed wirelessly.

**Highlights:** Project design with calculations (VdZ, BEG), Heating check according to EnSimiMaV and DIN SPEC 15378, OV-DMC 3 measuring system integration, Simplified heating load calculation (DIN 12831), DIN radiator and thermostatic valve sizing, ErP energy efficiency label creation, PDF documentation and wireless printing

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Oventrop free?

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

### Is Caleffi Pipe Sizer free?

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

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

Oventrop and Caleffi Pipe Sizer are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

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

Neither Oventrop nor Caleffi Pipe Sizer shows ads.

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

Oventrop ships an update monthly, and Caleffi Pipe Sizer every 7 months. Most recently, Oventrop was updated on September 10, 2026 and Caleffi Pipe Sizer on June 25, 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.*