# OpenSolar vs Contractor Marketing Lab

The clearest difference is in-app purchases: OpenSolar at none against Contractor Marketing Lab's 4. OpenSolar also leads on iOS requirement (15.7 vs 18.0). Contractor Marketing Lab's advantage is update cadence (weekly vs every 6 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Contractor Marketing Lab sells 4 in-app purchases, starting at $4.99 per month. OpenSolar asks for nothing beyond the download.

OpenSolar ships an update every 6 weeks, Contractor Marketing Lab weekly. The most recent releases landed on October 24, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | OpenSolar | Contractor Marketing Lab |
| --- | --- | --- |
| 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** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Weekly** |
| Monetization | Free | — |
| Size | 216 MB | 13 MB |
| Requires iOS | **15.7** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [OpenSolar Pty Ltd](https://appshunter.io/developer/1340033321) | [Nick Bader](https://appshunter.io/developer/1896661927) |

## 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


### Contractor Marketing Lab

[App page](https://appshunter.io/ios/app/contractor-marketing-lab/id6790739040)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Membership | $4.99 | per month |
| 40 AI Credits | $3.99 | one-time |
| 120 AI Credits | $9.99 | one-time |
| 300 AI Credits | $19.99 | one-time |


## Frequently asked questions

### Is OpenSolar free?

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

### Is Contractor Marketing Lab free?

Contractor Marketing Lab is free to download, with in-app purchases available.

### Do OpenSolar or Contractor Marketing Lab have ads?

Neither OpenSolar nor Contractor Marketing Lab shows ads.

### Which is updated more often, OpenSolar or Contractor Marketing Lab?

OpenSolar ships an update every 6 weeks, and Contractor Marketing Lab weekly. Most recently, OpenSolar was updated on October 24, 2026 and Contractor Marketing Lab on October 15, 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.*