# Solar APP vs Erebus Solar

The clearest difference is rating: Solar APP at 4.5 against Erebus Solar's 3.7. Solar APP also leads on ratings volume (46 vs 3). Erebus Solar's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price, review sentiment, device support and iOS requirement there is nothing between them.

Both are free to download. Solar APP sells 2 in-app purchases, starting at $9.99 per month. Erebus Solar asks for nothing beyond the download.

Solar APP holds the better App Store score, 4.5 against 3.7. That said, the two scores are not equally well evidenced: Solar APP has 46 ratings behind it against 3, so its average is the more settled of the two. Written reviews split almost evenly too, at 0% and 0% positive.

Solar APP ships an update every 4 months, Erebus Solar every 2 weeks. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Solar APP | Erebus Solar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (46 ratings)](https://appshunter.io/ios/app/solar-app-pv-solar-calculator/id6451967917/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/erebus-solar/id6790828521/reviews) |
| Number of ratings | **46** | 3 |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 17 MB | 19 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Igor Ilijovski](https://appshunter.io/developer/1492982127) | [Todd Evans](https://appshunter.io/developer/6790828523) |

## What reviewers say

### Solar APP

[App page](https://appshunter.io/ios/app/solar-app-pv-solar-calculator/id6451967917)

This tool provides comprehensive solar energy analysis, including system design, battery storage optimization, and real-time utility price tracking. Generate detailed PDF reports for your solar projects to make informed decisions and maximize savings.

**Highlights:** PDF Report Generation, Battery Storage System Optimization, Ultimate Solar Analysis, Optimal Power Calculation, Utility Consumption and Price Analysis

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Solar APP Premium 1 Month | $9.99 | per month |
| Solar APP Premium 12 Months | $39.99 | per year |


### Erebus Solar

[App page](https://appshunter.io/ios/app/erebus-solar/id6790828521)

This app helps solar professionals measure on-site shade using their phone's sensors. It generates horizon files compatible with leading PV design software, aiding in accurate solar production estimates.

**Highlights:** AR sun path visualization, Automatic sky capture, Sky Editor for obstruction tracing, Annual solar access analysis, PDF shade report export, Horizon file generation for design tools, Project organization by site

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

**In-app purchases:** none


## Frequently asked questions

### Is Solar APP free?

Solar APP is free to download, with in-app purchases available.

### Is Erebus Solar free?

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

### Which has better reviews, Solar APP or Erebus Solar?

Solar APP is rated higher. Solar APP averages 4.5 out of 5 from 46 ratings, while Erebus Solar averages 3.7 from 3 ratings.

### Do Solar APP or Erebus Solar have ads?

Solar APP shows ads; Erebus Solar does not.

### Which is updated more often, Solar APP or Erebus Solar?

Solar APP ships an update every 4 months, and Erebus Solar every 2 weeks. Most recently, Solar APP was updated on November 3, 2026 and Erebus Solar on October 31, 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.*