# ASHRAE Psychrometric Chart vs CPS Link

The clearest difference is price: CPS Link at Free against ASHRAE Psychrometric Chart's $19.99. CPS Link also leads on update cadence (every 3 weeks vs every 11 months) and device support (3 vs 1). ASHRAE Psychrometric Chart's advantage is review sentiment (27% vs 13%). On ads and in-app purchases there is nothing between them.

CPS Link is free to download; ASHRAE Psychrometric Chart costs $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ASHRAE Psychrometric Chart ships an update every 11 months, CPS Link every 3 weeks. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | ASHRAE Psychrometric Chart | CPS Link |
| --- | --- | --- |
| Price | $19.99 | **Free** |
| Rating | — | **[1.9 (157 ratings)](https://appshunter.io/ios/app/cps-link/id1185092042/reviews)** |
| Number of ratings | — | **157** |
| Positive reviews | **27.3% of reviews** | 13.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 3 weeks** |
| Monetization | Paid | **Free** |
| Size | 2 MB | 85 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ASHRAE, Inc.](https://appshunter.io/developer/375374912) | [CPS Products](https://appshunter.io/developer/945771072) |

## What reviewers say

### ASHRAE Psychrometric Chart

[App page](https://appshunter.io/ios/app/ashrae-psychrometric-chart/id584295008)

This interactive tool allows users to plot and customize psychrometric charts on their iPad. Easily create and save HVAC process graphs, update properties dynamically, and share charts and data via email. Supports both IP and SI units.

**Highlights:** Interactive psychrometric chart plotting, Customizable chart appearance, Dynamic property updates, Create and edit points and labels, Email charts and data, Unlimited projects and templates, Zoom and pinch functionality

**Features:** macOS Compatibility

**In-app purchases:** none


### CPS Link

[App page](https://appshunter.io/ios/app/cps-link/id1185092042)

Connect multiple wireless sensors to create a comprehensive diagnostic measurement system. Perform quick single measurements or complex full system diagnostics with analytics. Expand your system over time with new sensor solutions.

**Highlights:** Connect multiple wireless sensors, Comprehensive diagnostic measurement system, Perform quick measurements, Complex system diagnostics with analytics, Expandable sensor system

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 🚀 Worked well initially
- 💡 Useful features

**What reviewers complain about**

- 🐛 Frequent crashes
- 🔌 Connectivity issues
- ⚠️ Unreliable performance
- 💸 Expensive for poor quality

**Reported bugs**

- App crashes on launch
- Bluetooth connectivity problems
- Inconsistent readings and measurements
- Incompatible with newer iOS versions

**Requested features**

- Update app to fix compatibility issues
- Improve customer support and responsiveness
- Provide better documentation and troubleshooting guides


## Frequently asked questions

### Is ASHRAE Psychrometric Chart free?

ASHRAE Psychrometric Chart costs $19.99, with no in-app purchases.

### Is CPS Link free?

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

### Do ASHRAE Psychrometric Chart or CPS Link have ads?

Neither ASHRAE Psychrometric Chart nor CPS Link shows ads.

### Which is updated more often, ASHRAE Psychrometric Chart or CPS Link?

ASHRAE Psychrometric Chart ships an update every 11 months, and CPS Link every 3 weeks. Most recently, ASHRAE Psychrometric Chart was updated on November 1, 2026 and CPS Link on November 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.*