# WATTSTUNDESOLAR vs Next Level Systems

The clearest difference is iOS requirement: WATTSTUNDESOLAR at 11.0 against Next Level Systems's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

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

WATTSTUNDESOLAR ships an update every 5 weeks, Next Level Systems every 2 months. The most recent releases landed on October 3, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | WATTSTUNDESOLAR | Next Level Systems |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Size | 52 MB | 3 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [江西达伙网络科技有限公司](https://appshunter.io/developer/1234844673) | [Next Level Systems GmbH](https://appshunter.io/developer/1804878050) |

## What reviewers say

### WATTSTUNDESOLAR

[App page](https://appshunter.io/ios/app/wattstundesolar/id6449745523)

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

**In-app purchases:** none


### Next Level Systems

[App page](https://appshunter.io/ios/app/next-level-systems/id6743842535)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is WATTSTUNDESOLAR free?

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

### Is Next Level Systems free?

Next Level Systems is free to download, with no in-app purchases.

### Do WATTSTUNDESOLAR or Next Level Systems have ads?

Neither WATTSTUNDESOLAR nor Next Level Systems shows ads.

### Which is updated more often, WATTSTUNDESOLAR or Next Level Systems?

WATTSTUNDESOLAR ships an update every 5 weeks, and Next Level Systems every 2 months. Most recently, WATTSTUNDESOLAR was updated on October 3, 2026 and Next Level Systems on October 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.*