Comparison

Severe Service vs testo Smart

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

Head to head
About

Severe Service

This app helps users perform initial sizing for control valves, diagnose issues by selecting symptoms, and explore severe service applications across various industries. It also provides access to a technical library with videos and PDFs, a product catalog, and a contact feature for expert assistance.

Highlights
  • Control valve sizing tool
  • Issue diagnosis by symptom
  • Industry application explorer
  • Technical library with videos and PDFs
  • Fisher product catalog
  • Keyword search functionality
  • Direct contact with experts
Features
Read full description

App Features: • Sizing Tool: Quickly perform initial sizing for Fisher globe control valves. Share the results with anyone. • Diagnose an Issue: Choose the symptom that’s causing you headaches, then view Fisher products that combat the issue. • Industry Application: Access a list of severe service applications in Hydrocarbon, Power, and General Industries. • Technical Library: Keep up-to-speed on severe service issues by watching our videos and viewing PDFs. • Products: Browse thru an alphabetical listing of Fisher products and learn more about their functionality. • Search: Enter the first few letters of a keyword to easily find available topics and documents. • Contact Us: Submit a question, we have experts available to answer your questions at every step of the process.

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

Screenshots

Severe Service4 screens
testo Smart4 screens

Verdict

The call

The clearest difference is rating: Severe Service at 4.7 against testo Smart's 2.7. Severe Service also leads on in-app purchases (none vs 5) and iOS requirement (13.2 vs 18.0). testo Smart's advantage is ratings volume (170 vs 7). On price, update cadence, 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. Severe Service asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Severe Service holds the better App Store score, 4.7 against 2.7. That said, the two scores are not equally well evidenced: testo Smart has 170 ratings behind it against 7, so its average is the more settled of the two.

UpkeepUpdate frequency

Severe Service ships an update monthly, testo Smart every 2 months. The most recent releases landed on September 28, 2026 and October 20, 2026 respectively.

Scorecard5 real differences · 5 level
Severe Service versus testo Smart: the parameters behind the verdict, then further details
ParameterSevere Servicetesto Smart
PriceFreeFree
Rating4.7 (7 ratings) — better2.7 (170 ratings)
Positive reviews—16.3% of reviews
Number of ratings7170 — better
Update frequencyMonthly — betterEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.2 — better18.0
Further details — not scored
Size26 MB195 MB
Age rating4+4+
DeveloperEmerson Process ManagementTesto SE & Co. KGaA

Customer experience

Severe Service

All ratings7 ratings
Positive85.7%
Neutral14.3%
Negative0.0%

testo Smart

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

Bugs and requests

Severe Service

Not enough reviews yet to summarise bugs or 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

In-app purchases

None

Severe Service

No 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

Questions

Is Severe Service free?
Severe Service is free to download, with no in-app purchases.
Is testo Smart free?
testo Smart is free to download, with in-app purchases available.
Which has better reviews, Severe Service or testo Smart?
Severe Service is rated higher. Severe Service averages 4.7 out of 5 from 7 ratings, while testo Smart averages 2.7 from 170 ratings.
Do Severe Service or testo Smart have ads?
Neither Severe Service nor testo Smart shows ads.
Which is updated more often, Severe Service or testo Smart?
Severe Service ships an update monthly, and testo Smart every 2 months. Most recently, Severe Service was updated on September 28, 2026 and testo Smart on October 20, 2026.

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