# HVAC Psychrometric Plus vs DB50X

The clearest difference is rating: DB50X at 5.0 against HVAC Psychrometric Plus's 3.0. DB50X also leads on in-app purchases (none vs 1) and update cadence (every 3 weeks vs every 6 months). HVAC Psychrometric Plus's advantage is price ($6.99 vs $9.99). On ads, monetization model and device support there is nothing between them.

HVAC Psychrometric Plus costs $6.99 and DB50X $9.99 up front. HVAC Psychrometric Plus sells 1 one-off in-app purchase. DB50X asks for nothing beyond the download.

DB50X holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 9 respectively. Written reviews point the same way: 73% of HVAC Psychrometric Plus's written reviews are positive against 100% of DB50X's.

HVAC Psychrometric Plus ships an update every 6 months, DB50X every 3 weeks. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | HVAC Psychrometric Plus | DB50X |
| --- | --- | --- |
| Price | **$6.99** | $9.99 |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/hvac-psychrometric-plus/id348669031/reviews) | **[5.0 (9 ratings)](https://appshunter.io/ios/app/db50x/id6625971367/reviews)** |
| Number of ratings | 2 | **9** |
| Positive reviews | 72.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#175** |
| Size | 1 MB | 7 MB |
| Requires iOS | 17.0 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | +4 | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Christophe de Dinechin](https://appshunter.io/developer/1761608161) |

## What reviewers say

### HVAC Psychrometric Plus

[App page](https://appshunter.io/ios/app/hvac-psychrometric-plus/id348669031)

Perform single-state and mixed-air psychrometric calculations quickly and easily. Select input parameters and view updated results on a single screen. Supports 23 input combinations and offers email/spreadsheet export.

**Highlights:** Single-state psychrometric calculations, Mixed-air psychrometric calculations, 23 input parameter combinations, Real-time result updates, Universal app for iPhone and iPad, Email and spreadsheet export

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Equipment Locator | $9.99 | one-time |


### DB50X

[App page](https://appshunter.io/ios/app/db50x/id6625971367)

**Currently charting:** #175 Top Paid · Productivity (US App Store)

This scientific calculator offers high-precision computations with arbitrary precision for numbers. It supports advanced functions like complex numbers, matrices, symbolic calculations, and graphing, with a user-friendly interface and extensive built-in help.

**Highlights:** Arbitrary precision calculations, RPN and algebraic operations, Complex numbers, vectors, matrices, Symbolic and numerical solving, Graphing and plotting, Engineering units and constants, Unicode text support

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

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Psychrometric Plus free?

HVAC Psychrometric Plus costs $6.99, and also offers in-app purchases.

### Is DB50X free?

DB50X costs $9.99, with no in-app purchases.

### Which has better reviews, HVAC Psychrometric Plus or DB50X?

DB50X is rated higher. HVAC Psychrometric Plus averages 3.0 out of 5 from 2 ratings, while DB50X averages 5.0 from 9 ratings.

### Do HVAC Psychrometric Plus or DB50X have ads?

Neither HVAC Psychrometric Plus nor DB50X shows ads.

### Which is updated more often, HVAC Psychrometric Plus or DB50X?

HVAC Psychrometric Plus ships an update every 6 months, and DB50X every 3 weeks. Most recently, HVAC Psychrometric Plus was updated on October 29, 2026 and DB50X on October 30, 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.*