# PV Calculator. vs GridLab ROI

The clearest difference is in-app purchases: GridLab ROI at none against PV Calculator.'s 1. GridLab ROI also leads on update cadence (every 3 days vs every 7 months). PV Calculator.'s advantage is iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. PV Calculator. sells 1 one-off in-app purchase. GridLab ROI asks for nothing beyond the download.

PV Calculator. ships an update every 7 months, GridLab ROI every 3 days. Both last shipped on November 5, 2026.

## The numbers

| Metric | PV Calculator. | GridLab ROI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/pv-calculator/id6758427564/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 52 MB | 44 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nanjibhai Gorasiya](https://appshunter.io/developer/1834066312) | [Maksym Kovalov](https://appshunter.io/developer/1868068857) |

## What reviewers say

### PV Calculator.

[App page](https://appshunter.io/ios/app/pv-calculator/id6758427564)

This tool simplifies solar photovoltaic system design and analysis for professionals and students. It offers a comprehensive Energy Hub with multiple calculators, providing instant results, visual charts, and clear insights for efficient PV system planning and optimization.

**Highlights:** Energy Hub with multiple solar calculators, Calculate solar panel power output, Analyze energy generation (daily, monthly, yearly), Design solar array size, Calculate system voltage and configuration, Instant calculation results, Visual charts and performance summaries

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime premium | $9.99 | one-time |


### GridLab ROI

[App page](https://appshunter.io/ios/app/gridlab-roi/id6759988870)

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

**In-app purchases:** none


## Frequently asked questions

### Is PV Calculator. free?

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

### Is GridLab ROI free?

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

### Do PV Calculator. or GridLab ROI have ads?

Neither PV Calculator. nor GridLab ROI shows ads.

### Which is updated more often, PV Calculator. or GridLab ROI?

PV Calculator. ships an update every 7 months, and GridLab ROI every 3 days. Most recently, PV Calculator. was updated on November 5, 2026 and GridLab ROI on November 5, 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.*