# iSolergo vs Erebus Solar

The clearest difference is update cadence: Erebus Solar at every 2 weeks against iSolergo's every 9 months. iSolergo's advantage is device support (3 vs 1) and iOS requirement (11.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

iSolergo ships an update every 9 months, Erebus Solar every 2 weeks. The most recent releases landed on September 23, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | iSolergo | Erebus Solar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.7 (3 ratings)](https://appshunter.io/ios/app/erebus-solar/id6790828521/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 63 MB | 19 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Electro Graphics Srl](https://appshunter.io/developer/542354467) | [Todd Evans](https://appshunter.io/developer/6790828523) |

## What reviewers say

### iSolergo

[App page](https://appshunter.io/ios/app/isolergo/id542354464)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 iSolergo free?

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

### Is Erebus Solar free?

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

### Do iSolergo or Erebus Solar have ads?

Neither iSolergo nor Erebus Solar shows ads.

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

iSolergo ships an update every 9 months, and Erebus Solar every 2 weeks. Most recently, iSolergo was updated on September 23, 2026 and Erebus Solar 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.*