# RevierBuch vs Solar

The clearest difference is update cadence: Solar at every 3 weeks against RevierBuch's every 2 months. Solar also leads on iOS requirement (11.0 vs 14.0). 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.

RevierBuch ships an update every 2 months, Solar every 3 weeks. The most recent releases landed on October 25, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | RevierBuch | Solar |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 31 MB | 53 MB |
| Requires iOS | 14.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Eduard Horvath](https://appshunter.io/developer/1130879696) | [Lukas Klein](https://appshunter.io/developer/1716534841) |

## What reviewers say

### RevierBuch

[App page](https://appshunter.io/ios/app/revierbuch/id1564722942)

**Features:** macOS Compatibility

**In-app purchases:** none


### Solar

[App page](https://appshunter.io/ios/app/solar-rechner/id6446852474)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RevierBuch free?

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

### Is Solar free?

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

### Do RevierBuch or Solar have ads?

Neither RevierBuch nor Solar shows ads.

### Which is updated more often, RevierBuch or Solar?

RevierBuch ships an update every 2 months, and Solar every 3 weeks. Most recently, RevierBuch was updated on October 25, 2026 and Solar on November 3, 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.*