# MARSTEK vs Onntrack Pro

The clearest difference is update cadence: Onntrack Pro at every 3 days against MARSTEK's every 2 weeks. Onntrack Pro also leads on iOS requirement (12.0 vs 15.5). 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.

MARSTEK ships an update every 2 weeks, Onntrack Pro every 3 days. The most recent releases landed on September 30, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | MARSTEK | Onntrack Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (11 ratings)](https://appshunter.io/ios/app/marstek/id6459365638/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | 72.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Monetization | Free | — |
| Size | 210 MB | 113 MB |
| Requires iOS | 15.5 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Hamedata Technology Co., Limited](https://appshunter.io/developer/589308586) | [H-gen Beheer B.V.](https://appshunter.io/developer/1706266493) |

## What reviewers say

### MARSTEK

[App page](https://appshunter.io/ios/app/marstek/id6459365638)

Monitor your solar energy system in real-time. Optimize for energy independence, outage protection, or savings by setting your preferences. Control your system remotely and receive instant alerts.

**Highlights:** Real-time solar energy monitoring, Customizable optimization settings, Remote system control, Instant alerts, Energy independence focus, Outage protection settings, Savings optimization

**Features:** macOS Compatibility

**In-app purchases:** none


### Onntrack Pro

[App page](https://appshunter.io/ios/app/onntrack-pro/id6464569532)

**In-app purchases:** none


## Frequently asked questions

### Is MARSTEK free?

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

### Is Onntrack Pro free?

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

### Do MARSTEK or Onntrack Pro have ads?

Neither MARSTEK nor Onntrack Pro shows ads.

### Which is updated more often, MARSTEK or Onntrack Pro?

MARSTEK ships an update every 2 weeks, and Onntrack Pro every 3 days. Most recently, MARSTEK was updated on September 30, 2026 and Onntrack Pro on September 13, 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.*