# Solar Panel Calculator Plus vs Grace Solar

The clearest difference is price: Grace Solar at Free against Solar Panel Calculator Plus's $2.99. Grace Solar also leads on update cadence (fortnightly vs every 47 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Grace Solar is free to download; Solar Panel Calculator Plus costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Solar Panel Calculator Plus ships an update every 47 months, Grace Solar fortnightly. The most recent releases landed on October 27, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Solar Panel Calculator Plus | Grace Solar |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[3.3 (23 ratings)](https://appshunter.io/ios/app/solar-panel-calculator-plus/id1358184660/reviews)** | — |
| Number of ratings | **23** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 47 months | **Fortnightly** |
| Monetization | Paid | — |
| Size | 8 MB | 71 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [AHASOLAR TECHNOLOGIES LIMITED](https://appshunter.io/developer/1632224285) |

## What reviewers say

### Solar Panel Calculator Plus

[App page](https://appshunter.io/ios/app/solar-panel-calculator-plus/id1358184660)

Calculate custom off-grid solar home power systems. Determine the exact number of solar panels and battery capacity needed for your energy usage. Helps plan system size, inverter requirements, and battery bank specifications.

**Highlights:** Calculate solar panel requirements, Determine battery capacity, Calculate inverter size, Estimate daily energy usage, Plan days of autonomy, Optimize battery life calculations

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

**In-app purchases:** none


### Grace Solar

[App page](https://appshunter.io/ios/app/grace-solar/id1489691070)

**In-app purchases:** none


## Frequently asked questions

### Is Solar Panel Calculator Plus free?

Solar Panel Calculator Plus costs $2.99, with no in-app purchases.

### Is Grace Solar free?

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

### Do Solar Panel Calculator Plus or Grace Solar have ads?

Neither Solar Panel Calculator Plus nor Grace Solar shows ads.

### Which is updated more often, Solar Panel Calculator Plus or Grace Solar?

Solar Panel Calculator Plus ships an update every 47 months, and Grace Solar fortnightly. Most recently, Solar Panel Calculator Plus was updated on October 27, 2026 and Grace Solar on October 7, 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.*