# Allday HVAC Calc vs ReadCount

The clearest difference is price: Allday HVAC Calc at Free against ReadCount's $0.99. Allday HVAC Calc also leads on device support (3 vs 1) and iOS requirement (15.0 vs 18.6). ReadCount's advantage is in-app purchases (none vs 1) and update cadence (every 2 weeks vs every 3 months). On ads there is nothing between them.

Allday HVAC Calc is free to download; ReadCount costs $0.99 up front. Allday HVAC Calc sells 1 one-off in-app purchase. ReadCount asks for nothing beyond the download.

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

## The numbers

| Metric | Allday HVAC Calc | ReadCount |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/allday-hvac-calc/id6446276144/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | **Free** | Paid |
| Size | 38 MB | 20 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Dmitrii Pankov](https://appshunter.io/developer/1677093604) | [世峰 胡](https://appshunter.io/developer/6800756923) |

## 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 |


### ReadCount

[App page](https://appshunter.io/ios/app/readcount/id6802913361)

This app helps you track your reading progress by allowing you to photograph pages to count words or use voice to record thoughts. It provides visual calendars and analysis of your reading habits, with data stored locally for privacy.

**Highlights:** Photo-based word count, Voice recording for reading notes, Reading check-in and sharing, Reading calendar visualization, Weekly, monthly, and yearly analysis, Multi-reader profiles

**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 ReadCount free?

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

### Do Allday HVAC Calc or ReadCount have ads?

Neither Allday HVAC Calc nor ReadCount shows ads.

### Which is updated more often, Allday HVAC Calc or ReadCount?

Allday HVAC Calc ships an update every 3 months, and ReadCount every 2 weeks. Most recently, Allday HVAC Calc was updated on October 22, 2026 and ReadCount 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.*