# Prof Pref vs Inverter generator

The clearest difference is update cadence: Inverter generator at monthly against Prof Pref's every 6 months. Inverter generator also leads on iOS requirement (12.0 vs 15.0). 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.

Prof Pref ships an update every 6 months, Inverter generator monthly. The most recent releases landed on September 7, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Prof Pref | Inverter generator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Monthly** |
| Size | 1 MB | 28 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Vitaly Kulagin](https://appshunter.io/developer/1524623012) | [重庆盟讯电子科技有限公司](https://appshunter.io/developer/1725403004) |

## What reviewers say

### Prof Pref

[App page](https://appshunter.io/ios/app/prof-pref/id1662598113)

**Features:** macOS Compatibility

**In-app purchases:** none


### Inverter generator

[App page](https://appshunter.io/ios/app/inverter-generator/id6532601956)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Prof Pref free?

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

### Is Inverter generator free?

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

### Do Prof Pref or Inverter generator have ads?

Neither Prof Pref nor Inverter generator shows ads.

### Which is updated more often, Prof Pref or Inverter generator?

Prof Pref ships an update every 6 months, and Inverter generator monthly. Most recently, Prof Pref was updated on September 7, 2026 and Inverter generator on September 28, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*