# HydroCalc Basic vs Airflow CFM Calc HVAC

The clearest difference is price: HydroCalc Basic at Free against Airflow CFM Calc HVAC's $0.99. HydroCalc Basic also leads on ads (none vs shown). Airflow CFM Calc HVAC's advantage is iOS requirement (13.0 vs 15.1). On update cadence, in-app purchases and device support there is nothing between them.

HydroCalc Basic is free to download; Airflow CFM Calc HVAC costs $0.99 up front. HydroCalc Basic sells 1 one-off in-app purchase and Airflow CFM Calc HVAC sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

HydroCalc Basic ships an update every 11 days, Airflow CFM Calc HVAC fortnightly. The most recent releases landed on September 8, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | HydroCalc Basic | Airflow CFM Calc HVAC |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 11 days** | Fortnightly |
| Size | 35 MB | 30 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) | [Rizvan Adzhoian](https://appshunter.io/developer/1891746079) |

## What reviewers say

### HydroCalc Basic

[App page](https://appshunter.io/ios/app/hydrocalc-basic/id6752577110)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium - Flow Units & Ad-Free | $1.99 | one-time |


### Airflow CFM Calc HVAC

[App page](https://appshunter.io/ios/app/airflow-cfm-calc-hvac/id6764647262)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |


## Frequently asked questions

### Is HydroCalc Basic free?

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

### Is Airflow CFM Calc HVAC free?

Airflow CFM Calc HVAC costs $0.99, and also offers in-app purchases.

### Do HydroCalc Basic or Airflow CFM Calc HVAC have ads?

Airflow CFM Calc HVAC shows ads; HydroCalc Basic does not.

### Which is updated more often, HydroCalc Basic or Airflow CFM Calc HVAC?

HydroCalc Basic ships an update every 11 days, and Airflow CFM Calc HVAC fortnightly. Most recently, HydroCalc Basic was updated on September 8, 2026 and Airflow CFM Calc HVAC on September 10, 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.*