# PV Calculator. vs Grid Zero

The clearest difference is in-app purchases: Grid Zero at none against PV Calculator.'s 1. Grid Zero also leads on update cadence (every 5 days vs every 7 months). PV Calculator.'s advantage is iOS requirement (13.0 vs 15.1). 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. Grid Zero asks for nothing beyond the download.

PV Calculator. ships an update every 7 months, Grid Zero every 5 days. The most recent releases landed on August 20, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | PV Calculator. | Grid Zero |
| --- | --- | --- |
| 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 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 52 MB | 55 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nanjibhai Gorasiya](https://appshunter.io/developer/1834066312) | [GRIDZERO NEW ENERGY SOLUTIONS PRIVATE LIMITED](https://appshunter.io/developer/1896484252) |

## 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 |


### 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 PV Calculator. free?

PV Calculator. 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 PV Calculator. or Grid Zero have ads?

Neither PV Calculator. nor Grid Zero shows ads.

### Which is updated more often, PV Calculator. or Grid Zero?

PV Calculator. ships an update every 7 months, and Grid Zero every 5 days. Most recently, PV Calculator. was updated on August 20, 2026 and Grid Zero on September 8, 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.*