Comparison

CPS Link 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

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.

Highlights
  • Connect multiple wireless sensors
  • Comprehensive diagnostic measurement system
  • Perform quick measurements
  • Complex system diagnostics with analytics
  • Expandable sensor system
Read full description

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.

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

CPS Link4 screens
testo Smart4 screens

Verdict

The call

The clearest difference is rating: testo Smart at 2.7 against CPS Link's 1.9. CPS Link's advantage is in-app purchases (none vs 5) and update cadence (every 3 weeks vs every 2 months). On price, review sentiment, ratings volume and ads 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. CPS Link asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

testo Smart holds the better App Store score, 2.7 against 1.9. Both are backed by a comparable volume of ratings — 154 and 167 respectively. Written reviews point the same way: 13% of CPS Link's written reviews are positive against 16% of testo Smart's.

UpkeepUpdate frequency

CPS Link ships an update every 3 weeks, testo Smart every 2 months. The most recent releases landed on September 12, 2026 and September 20, 2026 respectively.

Scorecard5 real differences · 5 level
CPS Link versus testo Smart: the parameters behind the verdict, then further details
ParameterCPS Linktesto Smart
PriceFreeFree
Rating1.9 (154 ratings)2.7 (167 ratings) — better
Positive reviews13.5% of reviews16.3% of reviews — better
Number of ratings154167 — better
Update frequencyEvery 3 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS11.0 — better18.0
Further details — not scored
Size85 MB195 MB
Age rating4+4+
DeveloperCPS Products, Inc.Testo SE & Co. KGaA

Customer experience

CPS Link

All ratings154 ratings
Positive21.4%
Neutral0.6%
Negative77.9%
Written reviews104 reviews
Positive13.5%
Neutral1.0%
Negative85.6%

testo Smart

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

User reviews

CPS Link

From 154 App Store ratings

What we love

  • 👍 Easy to use
  • 🚀 Worked well initially
  • 💡 Useful features

Room to improve

  • 🐛 Frequent crashes
  • 🔌 Connectivity issues
  • ⚠️ Unreliable performance
  • 💸 Expensive for poor quality

testo Smart

From 167 App Store ratings

What we love

  • 👍 Good app with some features
  • 🚀 Great product
  • 🚀 Useful app for measurements

Room to improve

  • 🐛 App won't connect
  • 🐛 Connectivity issues
  • 🐛 Unreliable connection
  • 🐛 Forced updates
  • 🐛 Laggy and unresponsive UI

Bugs and 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

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

CPS Link

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 CPS Link free?
CPS Link 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, CPS Link or testo Smart?
testo Smart is rated higher. CPS Link averages 1.9 out of 5 from 154 ratings, while testo Smart averages 2.7 from 167 ratings.
Do CPS Link or testo Smart have ads?
Neither CPS Link nor testo Smart shows ads.
Which is updated more often, CPS Link or testo Smart?
CPS Link ships an update every 3 weeks, and testo Smart every 2 months. Most recently, CPS Link was updated on September 12, 2026 and testo Smart on September 20, 2026.

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