# Decision Logic vs Erebus Solar

The clearest difference is review sentiment: Decision Logic at 80% against Erebus Solar's 0%. Decision Logic also leads on rating (4.1 vs 3.7) and ratings volume (12 vs 3). Erebus Solar's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price and update cadence there is nothing between them.

Both are free to download. Decision Logic sells 2 in-app purchases, starting at $1.99 per 7 days. Erebus Solar asks for nothing beyond the download.

Decision Logic holds the better App Store score, 4.1 against 3.7. Both are backed by a comparable volume of ratings — 12 and 3 respectively. Written reviews point the same way: 80% of Decision Logic's written reviews are positive against 0% of Erebus Solar's.

Decision Logic ships an update every 3 weeks, Erebus Solar every 2 weeks. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Decision Logic | Erebus Solar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (12 ratings)](https://appshunter.io/ios/app/decision-logic-michi/id6748796286/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/erebus-solar/id6790828521/reviews) |
| Number of ratings | **12** | 3 |
| Positive reviews | **80.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 75 MB | 19 MB |
| Requires iOS | **14.0.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Southeast Adventures](https://appshunter.io/developer/1827386898) | [Todd Evans](https://appshunter.io/developer/6790828523) |

## What reviewers say

### Decision Logic

[App page](https://appshunter.io/ios/app/decision-logic-michi/id6748796286)

This app helps you make better decisions by comparing multiple options based on your priorities. It guides you through a structured process to evaluate choices, avoid regret, and feel confident in your selections.

**Highlights:** Step-by-step decision guidance, Compare multiple options, Define and rate decision factors, Visual breakdown of pros and cons, Save and revisit past decisions, Avoid impulse choices

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro Plan | $1.99 | per 7 days |
| Lifetime Pro Access | $1.99 | one-time |


### 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 Decision Logic free?

Decision Logic 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, Decision Logic or Erebus Solar?

Decision Logic is rated higher. Decision Logic averages 4.1 out of 5 from 12 ratings, while Erebus Solar averages 3.7 from 3 ratings.

### Do Decision Logic or Erebus Solar have ads?

Decision Logic shows ads; Erebus Solar does not.

### Which is updated more often, Decision Logic or Erebus Solar?

Decision Logic ships an update every 3 weeks, and Erebus Solar every 2 weeks. Most recently, Decision Logic was updated on November 5, 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.*