# Oventrop vs Helios ELS

The clearest difference is update cadence: Oventrop at monthly against Helios ELS's every 11 months. On price, ads, in-app purchases and device support there is nothing between them.

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

Oventrop ships an update monthly, Helios ELS every 11 months. The most recent releases landed on September 10, 2026 and August 16, 2026 respectively.

## The numbers

| Metric | Oventrop | Helios ELS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/oventrop/id396320655/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 44.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 11 months |
| Monetization | Free | — |
| Size | 48 MB | 28 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Oventrop GmbH & Co. KG](https://appshunter.io/developer/396298549) | [Helios Ventilatoren GmbH + Co KG](https://appshunter.io/developer/1553902986) |

## 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


### Helios ELS

[App page](https://appshunter.io/ios/app/helios-els/id6475874347)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Oventrop free?

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

### Is Helios ELS free?

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

### Do Oventrop or Helios ELS have ads?

Neither Oventrop nor Helios ELS shows ads.

### Which is updated more often, Oventrop or Helios ELS?

Oventrop ships an update monthly, and Helios ELS every 11 months. Most recently, Oventrop was updated on September 10, 2026 and Helios ELS on August 16, 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.*