# Solar PV System Designer vs Rool

The clearest difference is in-app purchases: Solar PV System Designer at none against Rool's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Rool sells 2 in-app purchases, starting at $12.99 per month. Solar PV System Designer asks for nothing beyond the download.

Solar PV System Designer ships an update weekly, Rool every 8 days. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Solar PV System Designer | Rool |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (5 ratings)](https://appshunter.io/ios/app/rool/id6768030742/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 8 days |
| Monetization | — | Freemium |
| Size | 222 MB | 13 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Cepoi Mario](https://appshunter.io/developer/1575099437) | [Lightpost One Limited](https://appshunter.io/developer/1896532453) |

## What reviewers say

### Solar PV System Designer

[App page](https://appshunter.io/ios/app/solar-pv-system-designer/id6755193110)

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

**In-app purchases:** none


### Rool

[App page](https://appshunter.io/ios/app/rool/id6768030742)

This app provides a private cloud-based AI assistant to help you with tasks, projects, and file management. It allows you to chat with an AI, create and edit files, generate content, and collaborate with others in isolated project environments.

**Highlights:** Private cloud computer, AI-powered task completion, File upload and management, Content generation (text, code, images), Persistent project memory, Collaborative work environments, Data export

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus | $12.99 | per month |
| Pro | $29.99 | per month |


## Frequently asked questions

### Is Solar PV System Designer free?

Solar PV System Designer is free to download, with no in-app purchases.

### Is Rool free?

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

### Do Solar PV System Designer or Rool have ads?

Neither Solar PV System Designer nor Rool shows ads.

### Which is updated more often, Solar PV System Designer or Rool?

Solar PV System Designer ships an update weekly, and Rool every 8 days. Most recently, Solar PV System Designer was updated on October 25, 2026 and Rool on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*