# OpenSolar vs Secrets to Win

The clearest difference is price: OpenSolar at Free against Secrets to Win's $9.99. Secrets to Win's advantage is update cadence (every 2 days vs every 6 weeks). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

OpenSolar is free to download; Secrets to Win costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

OpenSolar ships an update every 6 weeks, Secrets to Win every 2 days. The most recent releases landed on October 24, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | OpenSolar | Secrets to Win |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| 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 weeks | **Every 2 days** |
| Monetization | Free | — |
| Size | 216 MB | 37 MB |
| Requires iOS | 15.7 | **15.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [OpenSolar Pty Ltd](https://appshunter.io/developer/1340033321) | [P5Fi LLC](https://appshunter.io/developer/1879583508) |

## What reviewers say

### 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


### Secrets to Win

[App page](https://appshunter.io/ios/app/secrets-to-win/id6759573957)

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

**In-app purchases:** none


## Frequently asked questions

### Is OpenSolar free?

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

### Is Secrets to Win free?

Secrets to Win costs $9.99, with no in-app purchases.

### Do OpenSolar or Secrets to Win have ads?

Neither OpenSolar nor Secrets to Win shows ads.

### Which is updated more often, OpenSolar or Secrets to Win?

OpenSolar ships an update every 6 weeks, and Secrets to Win every 2 days. Most recently, OpenSolar was updated on October 24, 2026 and Secrets to Win on September 28, 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.*