# Allday HVAC Calc vs Locky Authentication

The clearest difference is in-app purchases: Locky Authentication at none against Allday HVAC Calc's 1. Allday HVAC Calc's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.3). On price and ads there is nothing between them.

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

## The numbers

| Metric | Allday HVAC Calc | Locky Authentication |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/allday-hvac-calc/id6446276144/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Monetization | Free | — |
| Size | 40 MB | 4 MB |
| Requires iOS | **15.0** | 17.3 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Dmitrii Pankov](https://appshunter.io/developer/1677093604) | [Binary Bros LLC](https://appshunter.io/developer/821142623) |

## 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

**In-app purchases (1)**

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


### Locky Authentication

[App page](https://appshunter.io/ios/app/locky-authentication/id6670600310)

**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 Locky Authentication free?

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

### Do Allday HVAC Calc or Locky Authentication have ads?

Neither Allday HVAC Calc nor Locky Authentication shows ads.

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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.*