# B vs SolarFos Pro

The clearest difference is update cadence: B at every 3 weeks against SolarFos Pro's every 5 months. SolarFos Pro's advantage is iOS requirement (12.0 vs 15.6). 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.

B ships an update every 3 weeks, SolarFos Pro every 5 months. The most recent releases landed on October 5, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | B | SolarFos Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 5 months |
| Size | 44 MB | 39 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BOE Energy Technology Co., Ltd.](https://appshunter.io/developer/1476777673) | [西安振森智能科技有限公司](https://appshunter.io/developer/1826710880) |

## What reviewers say

### B

[App page](https://appshunter.io/ios/app/b-isolar/id1476777674)

**Features:** macOS Compatibility

**In-app purchases:** none


### SolarFos Pro

[App page](https://appshunter.io/ios/app/solarfos-pro/id6748631885)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is B free?

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

### Is SolarFos Pro free?

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

### Do B or SolarFos Pro have ads?

Neither B nor SolarFos Pro shows ads.

### Which is updated more often, B or SolarFos Pro?

B ships an update every 3 weeks, and SolarFos Pro every 5 months. Most recently, B was updated on October 5, 2026 and SolarFos Pro on October 14, 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.*