# Mod Solar vs Grid Zero

The clearest difference is in-app purchases: Grid Zero at none against Mod Solar's 2. Grid Zero also leads on iOS requirement (15.1 vs 17.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Mod Solar sells 2 in-app purchases, starting at $0.99 per 7 days. Grid Zero asks for nothing beyond the download.

Mod Solar ships an update weekly, Grid Zero every 5 days. The most recent releases landed on September 14, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Mod Solar | Grid Zero |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Weekly | **Every 5 days** |
| Size | 5 MB | 55 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Savio Colombo](https://appshunter.io/developer/1840266069) | [Gridzero](https://appshunter.io/developer/1896484252) |

## What reviewers say

### Mod Solar

[App page](https://appshunter.io/ios/app/mod-solar-panel-project/id6763965089)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $0.99 | per 7 days |
| Monthly Subscription | $2.99 | per month |


### Grid Zero

[App page](https://appshunter.io/ios/app/grid-zero/id6767530347)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mod Solar free?

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

### Is Grid Zero free?

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

### Do Mod Solar or Grid Zero have ads?

Neither Mod Solar nor Grid Zero shows ads.

### Which is updated more often, Mod Solar or Grid Zero?

Mod Solar ships an update weekly, and Grid Zero every 5 days. Most recently, Mod Solar was updated on September 14, 2026 and Grid Zero on September 24, 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.*