# AirCalc_ vs THERble

The clearest difference is price: THERble at Free against AirCalc_'s $0.99. THERble also leads on iOS requirement (12.0 vs 15.0). AirCalc_'s advantage is update cadence (every 3 months vs every 16 months) and chart position (#178 vs unranked). On ads, in-app purchases and device support there is nothing between them.

THERble is free to download; AirCalc_ costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

AirCalc_ ships an update every 3 months, THERble every 16 months. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | AirCalc_ | THERble |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 16 months |
| Monetization | Paid | — |
| Best chart rank | **#178** | — |
| Size | 24 MB | 46 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [AIR DESIGN, INC.](https://appshunter.io/developer/923430781) | [SHIN NIPPON AIR TECHNOLOGIES CO.,LTD.](https://appshunter.io/developer/1526286874) |

## What reviewers say

### AirCalc_

[App page](https://appshunter.io/ios/app/aircalc/id923430782)

**Currently charting:** #178 Top Paid · Productivity (US App Store)

This app calculates the state of moist air using parameters like pressure, temperature, and humidity. It simplifies psychrometric diagram readings by allowing calculations with just three known values, assuming normal atmospheric pressure.

**Highlights:** Moist air state calculation, Pressure, temperature, humidity input, Specific enthalpy and volume calculation, Simplified psychrometric diagram readings, Adjustable pressure settings, Assumed temperature range: -20°C to 90°C

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

**In-app purchases:** none


### THERble

[App page](https://appshunter.io/ios/app/therble/id1630881111)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is AirCalc_ free?

AirCalc_ costs $0.99, with no in-app purchases.

### Is THERble free?

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

### Do AirCalc_ or THERble have ads?

Neither AirCalc_ nor THERble shows ads.

### Which is updated more often, AirCalc_ or THERble?

AirCalc_ ships an update every 3 months, and THERble every 16 months. Most recently, AirCalc_ was updated on October 24, 2026 and THERble on October 27, 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.*