# TommaTech vs Retgen

The clearest difference is update cadence: Retgen at every 11 days against TommaTech's every 6 weeks. TommaTech's advantage is iOS requirement (11.0 vs 15). 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.

TommaTech ships an update every 6 weeks, Retgen every 11 days. The most recent releases landed on June 8, 2026 and September 1, 2026 respectively.

## The numbers

| Metric | TommaTech | Retgen |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 12.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 11 days** |
| Monetization | Free | — |
| Size | 68 MB | 38 MB |
| Requires iOS | **11.0** | 15 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TommaTech GmbH](https://appshunter.io/developer/1564701290) | [Rast Teknoloji](https://appshunter.io/developer/1610709328) |

## What reviewers say

### TommaTech

[App page](https://appshunter.io/ios/app/tommatech/id1564701288)

Monitor your inverter's real-time performance, including power generation and consumption. Analyze operational data at a minute level to ensure optimal inverter function.

**Highlights:** Real-time inverter data viewing, Minute-level statistical analysis, Online status tracking, Power generation monitoring, Power consumption tracking

**Features:** macOS Compatibility

**In-app purchases:** none


### Retgen

[App page](https://appshunter.io/ios/app/retgen/id1610709326)

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

**In-app purchases:** none


## Frequently asked questions

### Is TommaTech free?

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

### Is Retgen free?

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

### Do TommaTech or Retgen have ads?

Neither TommaTech nor Retgen shows ads.

### Which is updated more often, TommaTech or Retgen?

TommaTech ships an update every 6 weeks, and Retgen every 11 days. Most recently, TommaTech was updated on June 8, 2026 and Retgen on September 1, 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.*