Comparison

testo Smart vs IHWAP Diagnostics

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

Head to head
About

testo Smart

This app supports measurements for refrigeration, HVAC, and heating systems. It also aids in food safety, frying oil quality, and indoor climate monitoring. Quickly interpret data, create digital reports with photos, and send them via email.

Highlights
  • All-in-one system measurements
  • Graphical display of measured values
  • Digital PDF/CSV measurement reports
  • Email report sharing
  • Leak test analysis
  • Automatic refrigerant charging
  • Indoor air quality monitoring
Features
Read full description

- All in one: The testo Smart App supports you with measurements on refrigeration, air conditioning, and heating systems, as well as in ensuring the safety and quality of food and frying oil, and in monitoring indoor climate and storage conditions. - Fast: Graphically descriptive display of measured values, e.g. as a table, for quick interpretation of results. - Efficient: Create digital measurement reports including. photos as PDF/ CSV files on site and send them via e-mail. The testo Smart App is compatible with the following Bluetooth®-enabled measuring instruments from Testo: - Thermal imager testo 860i for smartphones - All Testo Smart Probes - Digital manifolds testo 550s/557s/558s/550i/570s and testo 550/557 - Digital refrigerant scale testo 560i - Vacuum pump testo 565i - Flue gas analyzer testo 300/310 II/310 II EN - Vacuum gauge testo 552 - Clamp meter testo 770-3 - Volume flow hood testo 420 - Compact HVAC measuring instruments - Frying oil tester testo 270 BT - Temperature meter testo 110 Food - Dual purpose IR and penetration thermometer testo 104-IR BT - Data loggers 174 T BT & 174 H BT - Online data loggers testo 160, testo 162 & testo 164 GW Applications with the testo Smart App Refrigeration systems, air conditioning systems and heat pumps, heating systems, indoor air quality: - Leak test: Recording and analysis of the pressure drop curve. - Superheat and subcooling: Automatic determination of condensation and evaporation temperature and calculation of superheat / subcooling. - Target superheat: Automatic calculation of target superheat - Automatic refrigerant charging by weight, by superheat, by subcooling, and by target superheat - Vacuum measurement: Graphical progress display of the measurement with indication of start and differential value Indoor climate monitoring: - Indoor air quality: automatic calculation of the dew point and wet-bulb temperature - Temperature, humidity, lux, UV, pressure, CO2: the right data logger for every application – from a single solution to an online monitoring system" Ventilation systems: - Volume flow: After the intuitive input of the duct cross-section, the app calculates the volume flow fully automatically. - Diffuser measurements: simple parameterisation of the diffuser (dimensions and geometry), comparison of the volume flows of several diffusers when setting up a ventilation system, continuous and multi-point average calculation. Heating systems: - Flue gas measurement: Second screen function in combination with testo 300 - Measurement of gas flow and static gas pressure: Also possible parallel to the flue gas measurement (delta P) - Measurement of flow and return temperatures (delta T) Thermography: - Determining Delta T on heating, refrigeration/air conditioning, and industrial systems - Detecting hot/cold spots - Assessing the risk of mold Food safety: Temperature Control Points (CP/CCP): - Seamless documentation of measured values to fulfill HACCP specifications - Individually definable limit values and measurement comments within the App for each measurement point - Reporting and data export for regulatory requirements and internal quality assurance Frying oil quality: - Seamless documentation of measured values as well as calibration and adjustment of the measurement instrument - Individually definable limit values and measurement comments within the App for each measurement point - Reporting and data export for regulatory requirements and internal quality assurance --------------------------------------------------------- Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.testo.com/en/company/privacy-policy-app

About

IHWAP Diagnostics

This application assists with home weatherization by quantifying air leakage, calculating ventilation needs, and assessing duct system pressure against program standards. It helps prioritize air sealing and ensures compliance with energy efficiency guidelines.

Highlights
  • Zone Pressure Diagnostics (ZPD)
  • Total External Static Pressure (TESP) calculation
  • ASHRAE ventilation requirements
  • Leakage reduction potential estimation
  • ENERGY STAR compliance checks
Features
Read full description

Illinois Home Weatherization Assistance Program (IHWAP) Diagnostics application for the University of Illinois. This app is the product of a collaboration between the Indoor Climate Research & Training Center’s Senior Weatherization Trainer, Nate Price, and me. The Zone Pressure Diagnostics (ZPD) function will quantify the connection between the house and a zone and between that zone and the outdoors. It will also estimate the total leakage reduction potential in the zone, which should assist with prioritizing air sealing measures. The Total External Static Pressure (TESP) function will calculate total pressure and the pressure caused by the various components of a duct system and compare them to Illinois Home Weatherization Assistance Program (IHWAP) standards for recommended replacement options. The American Society of Heating and Air-Conditioning Engineers (ASHRAE) function will calculate home ventilation requirements ensuring proper pollutant control and ENERGY STAR compliance.

Screenshots

testo Smart4 screens
IHWAP Diagnostics4 screens

Verdict

The call

The clearest difference is review sentiment: IHWAP Diagnostics at 100% against testo Smart's 16%. IHWAP Diagnostics also leads on rating (5.0 vs 2.7) and in-app purchases (none vs 5). testo Smart's advantage is ratings volume (167 vs 5) and update cadence (every 2 months vs every 5 months). On price, ads 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

Both are free to download. testo Smart sells 5 in-app purchases, starting at $6.99 per month. IHWAP Diagnostics asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

IHWAP Diagnostics holds the better App Store score, 5.0 against 2.7. That said, the two scores are not equally well evidenced: testo Smart has 167 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 16% of testo Smart's written reviews are positive against 100% of IHWAP Diagnostics's.

UpkeepUpdate frequency

testo Smart ships an update every 2 months, IHWAP Diagnostics every 5 months. The most recent releases landed on September 25, 2026 and June 5, 2026 respectively.

Scorecard7 real differences · 3 level
testo Smart versus IHWAP Diagnostics: the parameters behind the verdict, then further details
Parametertesto SmartIHWAP Diagnostics
PriceFreeFree
Rating2.7 (167 ratings)5.0 (5 ratings) — better
Positive reviews16.3% of reviews100.0% of reviews — better
Number of ratings167 — better5
Update frequencyEvery 2 months — betterEvery 5 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.016.0 — better
Further details — not scored
Size195 MB75 MB
Age rating4+4+
DeveloperTesto SE & Co. KGaATravis Jenkins

Customer experience

testo Smart

All ratings167 ratings
Positive35.9%
Neutral13.2%
Negative50.9%
Written reviews153 reviews
Positive16.3%
Neutral17.6%
Negative66.0%

IHWAP Diagnostics

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

testo Smart

Reported bugs

5 issues
  • App won't connect to devices
  • Compatibility issues with newer iOS versions
  • Frequent crashes and freezes
  • Inability to save favorite refrigerants
  • Measurement data not displaying properly

Requested features

7 requests
  • Add option to toggle Bluetooth discovery
  • Improve Bluetooth range
  • Add ability to customize colors and graphs
  • Improve data export functionality
  • Add option to name sensors
Show 2 more
  • Improve multi-probe support
  • Integrate more features from physical devices

IHWAP Diagnostics

Not enough reviews yet to summarise bugs or requests.

In-app purchases

5 purchases

testo Smart

Subscriptions4
  • Multi-site measurement7 Days trial$6.991 Month
  • Air balancing7 Days trial$9.991 Month
  • Multi-site measurement$69.901 Year
Show 1 more
  • Air balancing$99.901 Year
One-time1
  • Logging digital manifold$44.99
None

IHWAP Diagnostics

No in-app purchases

Questions

Is testo Smart free?
testo Smart is free to download, with in-app purchases available.
Is IHWAP Diagnostics free?
IHWAP Diagnostics is free to download, with no in-app purchases.
Which has better reviews, testo Smart or IHWAP Diagnostics?
IHWAP Diagnostics is rated higher. testo Smart averages 2.7 out of 5 from 167 ratings, while IHWAP Diagnostics averages 5.0 from 5 ratings.
Do testo Smart or IHWAP Diagnostics have ads?
Neither testo Smart nor IHWAP Diagnostics shows ads.
Which is updated more often, testo Smart or IHWAP Diagnostics?
testo Smart ships an update every 2 months, and IHWAP Diagnostics every 5 months. Most recently, testo Smart was updated on September 25, 2026 and IHWAP Diagnostics on June 5, 2026.

Other comparisons