# Low vs AC Calculator

The clearest difference is in-app purchases: Low at none against AC Calculator's 2. Low also leads on iOS requirement (11.0 vs 18.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. AC Calculator sells 2 one-off in-app purchases. Low asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Low | AC Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (20 ratings)](https://appshunter.io/ios/app/ac-calculator-hvac-sizing/id1537174761/reviews)** |
| Number of ratings | — | **20** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | — | Free with in-app purchases |
| Size | 53 MB | 9 MB |
| Requires iOS | **11.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Danfoss A/S](https://appshunter.io/developer/423984644) | [Melchisedec Martinez Rodriguez](https://appshunter.io/developer/1534398511) |

## What reviewers say

### Low

[App page](https://appshunter.io/ios/app/low-gwp-tool/id943412217)

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

**In-app purchases:** none


### AC Calculator

[App page](https://appshunter.io/ios/app/ac-calculator-hvac-sizing/id1537174761)

This utility app simplifies HVAC sizing by calculating BTU/h capacity and recommending equipment. It offers unit conversions, price estimates, and energy consumption comparisons. Advanced features can be unlocked via in-app purchases.

**Highlights:** Calculate BTU/h capacity, Recommend equipment types, Convert BTU, kW, Kcal, Tons, Check price estimates, Compare inverter vs. conventional

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock View details | $4.99 | one-time |
| Unlock Advanced mode | $9.99 | one-time |


## Frequently asked questions

### Is Low free?

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

### Is AC Calculator free?

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

### Do Low or AC Calculator have ads?

Neither Low nor AC Calculator shows ads.

### Which is updated more often, Low or AC Calculator?

Low ships an update every 4 months, and AC Calculator every 4 months. Most recently, Low was updated on November 1, 2026 and AC Calculator on November 3, 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.*