# BPW ARC vs Sit Solar

The clearest difference is update cadence: Sit Solar at every 2 months against BPW ARC's every 15 months. Sit Solar also leads on iOS requirement (13.0 vs 15.1). 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.

BPW ARC ships an update every 15 months, Sit Solar every 2 months. The most recent releases landed on October 19, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | BPW ARC | Sit Solar |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 2 months** |
| Size | 28 MB | 146 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Zepping Innovative Solutions](https://appshunter.io/developer/1142285258) | [成都赛特新能科技有限公司](https://appshunter.io/developer/1691445203) |

## What reviewers say

### BPW ARC

[App page](https://appshunter.io/ios/app/bpw-arc/id1607320412)

**Features:** Vision Pro support

**In-app purchases:** none


### Sit Solar

[App page](https://appshunter.io/ios/app/sit-solar/id6449988665)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is BPW ARC free?

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

### Is Sit Solar free?

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

### Do BPW ARC or Sit Solar have ads?

Neither BPW ARC nor Sit Solar shows ads.

### Which is updated more often, BPW ARC or Sit Solar?

BPW ARC ships an update every 15 months, and Sit Solar every 2 months. Most recently, BPW ARC was updated on October 19, 2026 and Sit Solar on October 21, 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.*