Comparison

testo Smart vs FAI Assistant

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

FAI Assistant

Features
Read full description

Try FAI Assistant Pro for free! New users get a 3-day free trial of our weekly plan to experience the full power of AI-driven AS9102 reviews. NEW: One-time Lifetime Pro Access now available! FAI Assistant — Your Digital Partner for AS9102 Compliance FAI Assistant helps quality engineers, suppliers, and inspectors complete First Article Inspection (FAI) reviews with confidence and speed. Designed around the AS9102 Rev. C standard, this app simplifies complex forms, organizes notes, and generates professional reports — all in one place. FAI ASSISTANT PRO Unlock the full power of the app with a Monthly or Yearly subscription. Start with a 7-Day Free Trial to experience: • Smart AS9102 Forms: Guided Form 1, 2, and 3 entry with field explanations. • Ask AI: Get instant answers using ChatGPT or Google Gemini AI for clarity on fields, documents, or certifications. • FAI Review Generator: Quickly build and export review reports as professional PDFs. • FAI Checklist: Track compliance tasks and reduce errors. • Document & Certification Organizer: Keep reference materials and certifications at your fingertips. • SAE Licensed AS9102 Rev. C Tool: Load your licensed AS9102 PDF for in-app reference (optional). WHY FAI ASSISTANT? • Built specifically for aerospace and manufacturing quality professionals. • Save hours by reducing manual work and confusion. • Train new team members faster with AI-powered guidance. • Secure: You control your data. No Ads, Ever. SUBSCRIPTION INFORMATION FAI Assistant Pro is available as a monthly or yearly subscription. • Payment will be charged to your iTunes Account at confirmation of purchase. • Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. • Account will be charged for renewal within 24 hours prior to the end of the current period. • You can manage or turn off auto-renew in your Account Settings at any time after purchase. • Any unused portion of a free trial period will be forfeited if you purchase a subscription. LEGAL INFORMATION Terms of Use: https://faiassistant.com/terms Privacy Policy: https://faiassistant.com/privacy Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ FAI Assistant is designed and maintained by Aerospace QA Solutions LLC. For questions or support, visit https://faiassistant.com

Screenshots

testo Smart4 screens
FAI Assistant4 screens

Verdict

The call

The clearest difference is update cadence: FAI Assistant at every 2 weeks against testo Smart's every 2 months. FAI Assistant also leads on iOS requirement (16.0 vs 18.0). On price, 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

Both are free to download. testo Smart sells 5 in-app purchases, starting at $6.99 per month and FAI Assistant sells 4 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

testo Smart ships an update every 2 months, FAI Assistant every 2 weeks. The most recent releases landed on November 11, 2026 and October 28, 2026 respectively.

Scorecard2 real differences · 8 level
testo Smart versus FAI Assistant: the parameters behind the verdict, then further details
Parametertesto SmartFAI Assistant
PriceFreeFree
Rating2.7 (170 ratings) — better—
Positive reviews16.3% of reviews—
Number of ratings170 — better—
Update frequencyEvery 2 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.016.0 — better
Further details — not scored
Size195 MB52 MB
Age rating4+4+
DeveloperTesto SE & Co. KGaAAllan Bremer

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

FAI Assistant

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
4 purchases

FAI Assistant

Subscriptions3
  • Weekly Pro Access3 Days trial$4.997 Days
  • FAI Assistant Monthly7 Days trial$4.991 Month
  • FAI Assistant Yearly7 Days trial$39.991 Year
One-time1
  • Lifetime Pro Access$29.99

Questions

Is testo Smart free?
testo Smart is free to download, with in-app purchases available.
Is FAI Assistant free?
FAI Assistant is free to download, with in-app purchases available.
Do testo Smart or FAI Assistant have ads?
Neither testo Smart nor FAI Assistant shows ads.
Which is updated more often, testo Smart or FAI Assistant?
testo Smart ships an update every 2 months, and FAI Assistant every 2 weeks. Most recently, testo Smart was updated on November 11, 2026 and FAI Assistant on October 28, 2026.

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