# AC Calculator Pro vs ESL System｜

The clearest difference is price: ESL System｜ at Free against AC Calculator Pro's $9.99. ESL System｜ also leads on update cadence (every 2 weeks vs every 3 months) and iOS requirement (13.0 vs 18.6). On ads, in-app purchases and device support there is nothing between them.

ESL System｜ is free to download; AC Calculator Pro costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

AC Calculator Pro ships an update every 3 months, ESL System｜ every 2 weeks. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | AC Calculator Pro | ESL System｜ |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ac-calculator-pro/id1534398509/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 9 MB | 42 MB |
| Requires iOS | 18.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Melchisedec Martinez Rodriguez](https://appshunter.io/developer/1534398511) | [Soarfree](https://appshunter.io/developer/1746430123) |

## What reviewers say

### AC Calculator Pro

[App page](https://appshunter.io/ios/app/ac-calculator-pro/id1534398509)

This app assists HVAC professionals and homeowners with air conditioning and heat pump sizing. It provides detailed calculations for cooling/heating capacity, recommends equipment types, and offers unit equivalences and price estimates.

**Highlights:** Commercial Capacity Calculations (BTU/h), Recommended Equipment Types, Unit Equivalences (BTU, kW, Kcal, Tons), Updated Price Estimates, Energy Consumption Insights

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

**In-app purchases:** none


### ESL System｜

[App page](https://appshunter.io/ios/app/esl-system/id6502671453)

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

**In-app purchases:** none


## Frequently asked questions

### Is AC Calculator Pro free?

AC Calculator Pro costs $9.99, with no in-app purchases.

### Is ESL System｜ free?

ESL System｜ is free to download, with no in-app purchases.

### Do AC Calculator Pro or ESL System｜ have ads?

Neither AC Calculator Pro nor ESL System｜ shows ads.

### Which is updated more often, AC Calculator Pro or ESL System｜?

AC Calculator Pro ships an update every 3 months, and ESL System｜ every 2 weeks. Most recently, AC Calculator Pro was updated on October 27, 2026 and ESL System｜ on October 25, 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.*