Comparison

ASHRAE Psychrometric Chart vs Logi Options+ Mobile

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

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.

About

Logi Options+ Mobile

Enhance your keyboard experience by customizing keys for shortcuts and commands. This app also facilitates firmware updates for compatible accessories, boosting productivity and control.

Highlights
  • Customize keyboard keys
  • Assign shortcuts and commands
  • Increase productivity
  • Facilitate firmware updates
  • Control mobile accessories
Read full description

With the Logi Options+ Mobile App, your Flip Folio keyboard is now more powerful! You can now customize the keys on your Flip Folio to assign your favorite shortcuts and commands, increasing your productivity and giving you more control. The Logi Options+ Mobile App for iPadOS is an updated version of the Logitech Control app that facilitates firmware updates for only certain Logitech keyboards listed below. For all compatible devices, iPadOS 15 or later is required to use this app. DEVICES COMPATIBLE with KEY CUSTOMIZATION: - Flip Folio DEVICES COMPATIBLE with Firmware Updates ONLY: - Combo Touch - Keys-To-Go 2 - Folio Touch - Slim Combo - Slim Folio - Slim Folio Pro - Rugged Folio - Rugged Combo - Rugged Lite

Verdict

The call

The clearest difference is price: Logi Options+ Mobile at Free against ASHRAE Psychrometric Chart's $19.99. Logi Options+ Mobile also leads on update cadence (every 3 months vs every 11 months). ASHRAE Psychrometric Chart's advantage is review sentiment (27% vs 10%) and iOS requirement (13.0 vs 15.0). On ads, in-app purchases and device support 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

CostPrice · In-app purchases · Ads · Monetization

Logi Options+ Mobile 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.

UpkeepUpdate frequency

ASHRAE Psychrometric Chart ships an update every 11 months, Logi Options+ Mobile every 3 months. The most recent releases landed on November 1, 2026 and November 11, 2026 respectively.

Scorecard5 real differences · 5 level
ASHRAE Psychrometric Chart versus Logi Options+ Mobile: the parameters behind the verdict, then further details
ParameterASHRAE Psychrometric ChartLogi Options+ Mobile
Price$19.99Free — better
Rating—4.4 (11 ratings) — better
Positive reviews27.3% of reviews — better10.2% of reviews
Number of ratings—11 — better
Update frequencyEvery 11 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPadiPad, Vision Pro — better
Requires iOS13.0 — better15.0
Further details — not scored
Size2 MB139 MB
Age rating4+4+
DeveloperASHRAE, Inc.Logitech Inc.

Customer experience

ASHRAE Psychrometric Chart

Written reviews11 reviews
Positive27.3%
Neutral27.3%
Negative45.5%

Logi Options+ Mobile

All ratings187 ratings
Positive54.0%
Neutral2.1%
Negative43.9%
Written reviews1,301 reviews
Positive10.2%
Neutral7.3%
Negative82.5%

Bugs and requests

ASHRAE Psychrometric Chart

Not enough reviews yet to summarise bugs or requests.

Logi Options+ Mobile

Reported bugs

4 issues
  • Keyboard not working after firmware update
  • Trackpad not working after firmware update
  • App crashing on launch
  • App not recognizing connected keyboard

Requested features

3 requests
  • Add support for more Logitech devices
  • Bring back customization options removed from the app
  • Improve app functionality beyond just firmware updates

In-app purchases

None

ASHRAE Psychrometric Chart

No in-app purchases

None

Logi Options+ Mobile

No in-app purchases

Questions

Is ASHRAE Psychrometric Chart free?
ASHRAE Psychrometric Chart costs $19.99, with no in-app purchases.
Is Logi Options+ Mobile free?
Logi Options+ Mobile is free to download, with no in-app purchases.
Do ASHRAE Psychrometric Chart or Logi Options+ Mobile have ads?
Neither ASHRAE Psychrometric Chart nor Logi Options+ Mobile shows ads.
Which is updated more often, ASHRAE Psychrometric Chart or Logi Options+ Mobile?
ASHRAE Psychrometric Chart ships an update every 11 months, and Logi Options+ Mobile every 3 months. Most recently, ASHRAE Psychrometric Chart was updated on November 1, 2026 and Logi Options+ Mobile on November 11, 2026.

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