# Allday HVAC Calc vs Aspen Compressor Controller

The clearest difference is in-app purchases: Aspen Compressor Controller at none against Allday HVAC Calc's 1. Allday HVAC Calc's advantage is iOS requirement (15.0 vs 17.2). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Allday HVAC Calc sells 1 one-off in-app purchase. Aspen Compressor Controller asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Allday HVAC Calc against 5.0 for Aspen Compressor Controller. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Allday HVAC Calc ships an update every 3 months, Aspen Compressor Controller every 2 months. The most recent releases landed on October 22, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Allday HVAC Calc | Aspen Compressor Controller |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/allday-hvac-calc/id6446276144/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/aspen-compressor-controller/id6740006506/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 38 MB | 1 MB |
| Requires iOS | **15.0** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Dmitrii Pankov](https://appshunter.io/developer/1677093604) | [Aspen Compressor, LLC](https://appshunter.io/developer/1787909268) |

## What reviewers say

### Allday HVAC Calc

[App page](https://appshunter.io/ios/app/allday-hvac-calc/id6446276144)

This app offers three specialized modules for HVAC engineers: a psychrometric calculator for air properties, a pipe calculator for fluid dynamics and selection, and a duct calculator for air speed and pressure loss. It provides detailed calculations and reference formulas in both SI and IP units.

**Highlights:** Psychrometric air property calculations, Pipe velocity and pressure loss calculation, Duct speed and pressure loss calculation, Interdependent parameter calculations, Reference formulas included, SI and IP unit support

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Allday Design Assist | $4.99 | one-time |


### Aspen Compressor Controller

[App page](https://appshunter.io/ios/app/aspen-compressor-controller/id6740006506)

Monitor and adjust your compressor system's performance. This application connects to the Aspen Compressor Control Board to display real-time readings like speeds and temperatures, enabling optimized operation.

**Highlights:** Monitor compressor speeds, Display system temperatures, Control fan speeds, Optimize system performance, Connect to control board

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Allday HVAC Calc free?

Allday HVAC Calc is free to download, with in-app purchases available.

### Is Aspen Compressor Controller free?

Aspen Compressor Controller is free to download, with no in-app purchases.

### Which has better reviews, Allday HVAC Calc or Aspen Compressor Controller?

Allday HVAC Calc and Aspen Compressor Controller are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Allday HVAC Calc or Aspen Compressor Controller have ads?

Neither Allday HVAC Calc nor Aspen Compressor Controller shows ads.

### Which is updated more often, Allday HVAC Calc or Aspen Compressor Controller?

Allday HVAC Calc ships an update every 3 months, and Aspen Compressor Controller every 2 months. Most recently, Allday HVAC Calc was updated on October 22, 2026 and Aspen Compressor Controller on October 15, 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.*