# BS Solar vs Queen Tech

The clearest difference is update cadence: BS Solar at every 2 months against Queen Tech's every 7 months. BS Solar also leads on iOS requirement (13.0 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.

BS Solar ships an update every 2 months, Queen Tech every 7 months. The most recent releases landed on September 29, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | BS Solar | Queen Tech |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 7 months |
| Monetization | Free | — |
| Size | 17 MB | 204 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Suzhou Jiale Information Technology Co., Ltd.](https://appshunter.io/developer/1171647925) | [Shanghai Siseli New Energy Cooperative Enterprise](https://appshunter.io/developer/1673700559) |

## What reviewers say

### BS Solar

[App page](https://appshunter.io/ios/app/bs-solar/id1528932223)

This app allows users to easily view photovoltaic (PV) data from their solar systems. It provides detailed graphics on power output, generated energy, and system yield, supporting end-users, distributors, and installers. Registration is required to use the app with your plant.

**Highlights:** Easy PV data viewing, System performance graphics, Power output monitoring, Generated energy tracking, Yield information, Supports end-users, distributors, and installers

**Features:** macOS Compatibility

**In-app purchases:** none


### Queen Tech

[App page](https://appshunter.io/ios/app/queen-tech/id6749222638)

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

**In-app purchases:** none


## Frequently asked questions

### Is BS Solar free?

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

### Is Queen Tech free?

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

### Do BS Solar or Queen Tech have ads?

Neither BS Solar nor Queen Tech shows ads.

### Which is updated more often, BS Solar or Queen Tech?

BS Solar ships an update every 2 months, and Queen Tech every 7 months. Most recently, BS Solar was updated on September 29, 2026 and Queen Tech on October 15, 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.*