# Solar vs OpenSolar

The clearest difference is update cadence: OpenSolar at every 6 weeks against Solar's every 6 months. Solar's advantage is iOS requirement (10.0 vs 15.7). 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.

Solar ships an update every 6 months, OpenSolar every 6 weeks. The most recent releases landed on October 26, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Solar | OpenSolar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.4 (10 ratings)](https://appshunter.io/ios/app/opensolar/id1410085935/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | — | 45.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 6 weeks** |
| Monetization | — | Free |
| Size | 53 MB | 216 MB |
| Requires iOS | **10.0** | 15.7 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ministry of Energy UAE](https://appshunter.io/developer/1099165415) | [OpenSolar Pty Ltd](https://appshunter.io/developer/1340033321) |

## What reviewers say

### Solar

[App page](https://appshunter.io/ios/app/solar-calories/id1384180065)

**Features:** macOS Compatibility

**In-app purchases:** none


### OpenSolar

[App page](https://appshunter.io/ios/app/opensolar/id1410085935)

This free application provides a comprehensive solution for designing and selling solar energy systems. It offers end-to-end functionality for solar professionals.

**Highlights:** End-to-end solar design, Sales application, Free to use, Comprehensive functionality

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

**In-app purchases:** none


## Frequently asked questions

### Is Solar free?

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

### Is OpenSolar free?

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

### Do Solar or OpenSolar have ads?

Neither Solar nor OpenSolar shows ads.

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

Solar ships an update every 6 months, and OpenSolar every 6 weeks. Most recently, Solar was updated on October 26, 2026 and OpenSolar on November 2, 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.*