# PV Calculator Lite Version vs AirPro

The clearest difference is in-app purchases: PV Calculator Lite Version at none against AirPro's 2. PV Calculator Lite Version also leads on ads (none vs shown) and iOS requirement (13.4 vs 16.0). AirPro's advantage is update cadence (every 4 days vs every 10 days). On price, rating, ratings volume and device support there is nothing between them.

Both are free to download. AirPro sells 2 in-app purchases, starting at $7.99 per month. PV Calculator Lite Version asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for PV Calculator Lite Version against 5.0 for AirPro. Both are backed by a comparable volume of ratings — 2 and 5 respectively.

PV Calculator Lite Version ships an update every 10 days, AirPro every 4 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | PV Calculator Lite Version | AirPro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/pv-calculator-lite-version/id6459019012/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/airpro-btu-calculator/id6470185437/reviews) |
| Number of ratings | 2 | **5** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 10 days | **Every 4 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 38 MB | 18 MB |
| Requires iOS | **13.4** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sven Schwertner](https://appshunter.io/developer/1700478261) | [Igor Ilijovski](https://appshunter.io/developer/1492982127) |

## What reviewers say

### PV Calculator Lite Version

[App page](https://appshunter.io/ios/app/pv-calculator-lite-version/id6459019012)

Estimate the potential of solar energy generation at your location. This tool offers detailed calculations for electricity fed into the grid, purchased electricity, annual savings, and payback time. It features site-specific solar irradiance and hourly resolution for accurate production and storage planning.

**Highlights:** Calculate electricity fed into grid and purchased, Estimate annual savings and payback time, Site-specific solar irradiance data, Hourly resolution for production and storage, Define PV modules, inverters, and load profiles, Automatic optimal orientation determination, Roof area measurement and panel positioning

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

**In-app purchases:** none


### AirPro

[App page](https://appshunter.io/ios/app/airpro-btu-calculator/id6470185437)

This tool helps you calculate the right size for air conditioners, heat pumps, and furnaces. It provides detailed analysis of heating and cooling costs, energy consumption, and temperature data. You can also evaluate domestic hot water needs and financial aspects like payback periods.

**Highlights:** BTU estimation for HVAC systems, Monthly heating and cooling cost calculation, Energy consumption and temperature analysis, Domestic hot water needs evaluation, Financial analysis including payback periods, Data export to CSV and PDF reports

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AirPro Premium - Monthly | $7.99 | per month |
| AirPro Premium - Annual | $29.99 | per year |


## Frequently asked questions

### Is PV Calculator Lite Version free?

PV Calculator Lite Version is free to download, with no in-app purchases.

### Is AirPro free?

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

### Which has better reviews, PV Calculator Lite Version or AirPro?

PV Calculator Lite Version and AirPro are both rated 5.0 out of 5 on the App Store, from 2 and 5 ratings respectively.

### Do PV Calculator Lite Version or AirPro have ads?

AirPro shows ads; PV Calculator Lite Version does not.

### Which is updated more often, PV Calculator Lite Version or AirPro?

PV Calculator Lite Version ships an update every 10 days, and AirPro every 4 days. Most recently, PV Calculator Lite Version was updated on October 24, 2026 and AirPro on October 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.*