Comparison

HVAC PT Chart vs SmarTech

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

Head to head
About

HVAC PT Chart

This tool provides HVAC technicians with instant access to pressure and temperature data for over 100 refrigerants. It allows users to input one value to find the other, view detailed refrigerant properties, and email comprehensive charts and data.

Highlights
  • Pressure/temperature lookup for 100+ refrigerants
  • Input temperature to find pressure, or vice versa
  • Slider control for precise value selection
  • Email complete PT chart lists and refrigerant properties
  • Display common refrigerant properties
  • Adjust for atmospheric pressure based on city elevation
  • English and Metric unit options
Features
Read full description

HVAC PT Chart is an electronic pressure temperature calculator that allows HVAC technicians and contractors to quickly look up the temperature and corresponding pressure for 100+ common HVAC refrigerants including both bubble and dew versions of azeotropic (mixture) refrigerants. This is the only PT Chart app that allows you to email complete PT chart lists, refrigerant properties, and your inputted values/results. This is a unique PT Chart app for the following reasons: 1. Works on both the Apple iPhone and iPad (and adjusts its screen according to the mobile device screen size, whether you are running it on the iPhone 13 or the iPad) 2. Optimized for iOS 16 3. Includes 100+ refrigerants 4. Allows you to input the temperature and then the corresponding pressure will display and vice versa. 5. Allows you to also use a slider control to specify the exact pressure or temperature to see the corresponding temperature or pressure 6. Displays a list of pressure/temperature values in 1 degree increments 7. Allows you to select the atmospheric pressure so as to show the true pressure-temperature relationship even for high elevations 8. Includes a database of 1000+ cities world-wide with elevation data that is used to derive atmospheric pressure 9. Display common properties for the selected refrigerant (oil type, GWP, composition, critical temp, boiling temp, and more...) 10. Email project inputs and properties for the selected refrigerant 11. Email the full pressure/temperature list for the selected refrigerant 12. Display units in both English and Metric 13. Includes both dew and bubble versions of any azeotropic (mixture) refrigerants 14. This app now includes the HVAC Equipment Locator. Click here for details: http://bit.ly/1yTq539

About

SmarTech

This app connects to a digital manifold to display accurate pressure and temperature readings. It offers real-time Superheat and Subcooling calculations, supports over 109 refrigerants, and features a "Smart Charge Zone" for optimal system charging. Users can also generate and export system performance reports.

Highlights
  • Real-time pressure and temperature readings
  • Superheat and Subcooling calculations
  • 109+ refrigerant types supported
  • Smart Charge Zone indicator
  • System performance reporting
  • PDF/CSV report export
Features
Read full description

The Uniweld SmarTech™ Digital Manifold App communicates with your SmarTech™ Digital Manifold to clearly display professionally accurate pressure and temperature readings in the palm of your hand. Monitor target and actual Superheat and Subcooling calculations in real-time, as pressure and temperature readings fluctuate. Choose from over 109 different refrigerant types and create a custom list of your most commonly used refrigerants. SMART CHARGE ZONE: All the guess work is taken out of properly charging the system with the color coded Smart Charge Zone feature. The difference between the target and actual Superheat or Subcooling is shown with color indicators that signal whether the system is overcharged (RED), undercharged (BLUE), or has an accurate "In The Zone" system charge (GREEN). REPORTING: Take your business to the next level with system performance reporting. Enter company details along with customer and equipment information and with one touch, produce a SmarTech™ Verified System Performance Report that is ready for export as a PDF or CSV file. Reports can easily be emailed for saving, tracking, or printing. Uniweld Products, Inc... "Quality Tools That Go To Work With You®". This app also works as a free, stand-alone P/T Calculator!

Screenshots

HVAC PT Chart4 screens
SmarTech3 screens

Verdict

The call

The clearest difference is in-app purchases: SmarTech at none against HVAC PT Chart's 1. HVAC PT Chart's advantage is rating (4.0 vs 3.6) and review sentiment (56% vs 25%). On price, ratings volume, ads and monetization model 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

Both are free to download. HVAC PT Chart sells 1 one-off in-app purchase. SmarTech asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

HVAC PT Chart holds the better App Store score, 4.0 against 3.6. Both are backed by a comparable volume of ratings — 8 and 9 respectively. Written reviews point the same way: 56% of HVAC PT Chart's written reviews are positive against 25% of SmarTech's.

UpkeepUpdate frequency

HVAC PT Chart ships an update every 4 months, SmarTech every 12 months. The most recent releases landed on September 9, 2026 and June 1, 2026 respectively.

Scorecard5 real differences · 5 level
HVAC PT Chart versus SmarTech: the parameters behind the verdict, then further details
ParameterHVAC PT ChartSmarTech
PriceFreeFree
Rating4.0 (8 ratings) — better3.6 (9 ratings)
Positive reviews55.6% of reviews — better25.0% of reviews
Number of ratings89 — better
Update frequencyEvery 4 months — betterEvery 12 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.1 — better15.6
Further details — not scored
Size27 MB21 MB
Age rating4+4+
DeveloperCarmel Software CorporationUniweld Products, Inc.

Customer experience

HVAC PT Chart

All ratings8 ratings
Positive62.5%
Neutral25.0%
Negative12.5%
Written reviews9 reviews
Positive55.6%
Neutral33.3%
Negative11.1%

SmarTech

All ratings9 ratings
Positive55.6%
Neutral11.1%
Negative33.3%
Written reviews4 reviews
Positive25.0%
Neutral25.0%
Negative50.0%

In-app purchases

1 purchases

HVAC PT Chart

One-time1
  • HVAC Equipment Locator$9.99
None

SmarTech

No in-app purchases

Questions

Is HVAC PT Chart free?
HVAC PT Chart is free to download, with in-app purchases available.
Is SmarTech free?
SmarTech is free to download, with no in-app purchases.
Which has better reviews, HVAC PT Chart or SmarTech?
HVAC PT Chart is rated higher. HVAC PT Chart averages 4.0 out of 5 from 8 ratings, while SmarTech averages 3.6 from 9 ratings.
Do HVAC PT Chart or SmarTech have ads?
Neither HVAC PT Chart nor SmarTech shows ads.
Which is updated more often, HVAC PT Chart or SmarTech?
HVAC PT Chart ships an update every 4 months, and SmarTech every 12 months. Most recently, HVAC PT Chart was updated on September 9, 2026 and SmarTech on June 1, 2026.

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