# Psychrometric Chart vs ZIGLY

The clearest difference is price: ZIGLY at Free against Psychrometric Chart's $59.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

ZIGLY is free to download; Psychrometric Chart costs $59.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Psychrometric Chart ships an update every 3 months, ZIGLY every 6 weeks. The most recent releases landed on October 7, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Psychrometric Chart | ZIGLY |
| --- | --- | --- |
| Price | $59.99 | **Free** |
| Rating | **[4.4 (34 ratings)](https://appshunter.io/ios/app/psychrometric-chart/id1026273214/reviews)** | — |
| Number of ratings | **34** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | Paid | — |
| Size | 32 MB | 19 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pheinex, LLC](https://appshunter.io/developer/996932317) | [InnovaAge](https://appshunter.io/developer/905727914) |

## What reviewers say

### Psychrometric Chart

[App page](https://appshunter.io/ios/app/psychrometric-chart/id1026273214)

An interactive tool for HVAC engineers to create and manipulate psychrometric charts. Model various air processes, add and adjust state points with live property updates, and save multiple charts. Export your designs as PDFs or via AirPrint.

**Highlights:** Interactive psychrometric charts, Model air mixing and heating/cooling, Live state point adjustment, SI and IP unit support, Save and manage multiple charts, Export charts as PDF, AirPrint compatibility

**Features:** Vision Pro support

**In-app purchases:** none


### ZIGLY

[App page](https://appshunter.io/ios/app/zigly/id1575420181)

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

**In-app purchases:** none


## Frequently asked questions

### Is Psychrometric Chart free?

Psychrometric Chart costs $59.99, with no in-app purchases.

### Is ZIGLY free?

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

### Do Psychrometric Chart or ZIGLY have ads?

Neither Psychrometric Chart nor ZIGLY shows ads.

### Which is updated more often, Psychrometric Chart or ZIGLY?

Psychrometric Chart ships an update every 3 months, and ZIGLY every 6 weeks. Most recently, Psychrometric Chart was updated on October 7, 2026 and ZIGLY on October 4, 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.*