ASHRAE Psychrometric Chart vs CPS Link
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ASHRAE Psychrometric Chart
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.
- 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
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The HVAC Psychrometric Chart app is the first truly interactive graphical psychrometric chart for the iPad, and it includes both IP and SI units. It is now optimized for iOS 16. Using your finger, you can easily plot HVAC and other psychrometric processes on the iPad screen while you are out in the field, save the graphs, and then email the graph and results to yourself or clients. The HVAC Psych Chart app includes the following features and functionality: 1. Displays a fully customizable psychrometric chart in both landscape and portrait modes. 2. Allows you to customize the graph in many different ways including specifying the psychrometric chart line colors, chart background color, hide/display status of chart lines, point colors, process line colors, units of graph values, and the min/max limits of the chart. 3. Using your finger, you can plot as many points as you want on the screen. As you move your finger around the graph, the psychrometric properties at the top of the screen dynamically update . In addition, you can double-tap a point to display the point properties and then edit them. 4. Create psychrometric processes by plotting points then connecting them with process lines. Also, create custom labels anywhere on the chart. 5. After you have completed creating the chart, you can email a list of all the points and their properties along with a PDF of the chart, itself. 6. Create an unlimited number of psychrometric chart projects. Also, you can create templates that you can reuse over and over again. 7. Zoom in or out of the chart by "pinching" the iPad screen so as to view items in more detail. 8. Display sensible heat ratio (SHR) line 9. Display psych process line as curved along 100% RH line.
CPS Link
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.
- Connect multiple wireless sensors
- Comprehensive diagnostic measurement system
- Perform quick measurements
- Complex system diagnostics with analytics
- Expandable sensor system
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CPS Link™ is a powerful, easy-to-use application that connects multiple CPS wireless sensors together at one time to create the world’s most comprehensive diagnostic measurement system. The flexibility of this patented system enables users to add sensors as required to perform quick one-step measurement tasks or more complex full home, facility or system diagnostics with analytics. A range of high quality wireless sensors are available to accommodate most common HVAC/R service needs, with more innovative sensor solutions in various levels of release and development. Interconnectivity between the CPS Link app and future sensors remains a primary criterion to provide users with the flexibility of building their own custom measurement systems, over time.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | ASHRAE Psychrometric Chart | CPS Link |
|---|---|---|
| Price | $19.99 | Free — better |
| Rating | — | 1.9 (157 ratings) — better |
| Positive reviews | 27.3% of reviews — better | 13.3% of reviews |
| Number of ratings | — | 157 — better |
| Update frequency | Every 11 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 85 MB |
| Age rating | 4+ | 4+ |
| Developer | ASHRAE, Inc. | CPS Products |
Customer experience
ASHRAE Psychrometric Chart
CPS Link
Bugs and requests
ASHRAE Psychrometric Chart
Not enough reviews yet to summarise bugs or requests.
CPS Link
Reported bugs
4 issues- App crashes on launch
- Bluetooth connectivity problems
- Inconsistent readings and measurements
- Incompatible with newer iOS versions
Requested features
3 requests- Update app to fix compatibility issues
- Improve customer support and responsiveness
- Provide better documentation and troubleshooting guides
In-app purchases
ASHRAE Psychrometric Chart
No in-app purchases
CPS Link
No in-app purchases
Questions
Is ASHRAE Psychrometric Chart free?
Is CPS Link free?
Do ASHRAE Psychrometric Chart or CPS Link have ads?
Which is updated more often, ASHRAE Psychrometric Chart or CPS Link?
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