Comparison

testo Smart vs Invoice Maker

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

Invoice Maker

Create and send professional invoices quickly and easily. Save client and service details for faster billing, track payments, and export polished PDF invoices. Ideal for freelancers and small businesses needing efficient invoicing.

Highlights
  • Fast invoice creation (under 30 seconds)
  • Smart templates for clients and services
  • PDF export for sharing
  • Multi-currency support
  • Payment tracking dashboard
  • Offline access
Features
Read full description

Invoice Maker — simple tool to create and send invoices fast. Perfect for freelancers, small businesses, and professionals who need quick, clean, and professional billing. Why users choose Invoice Maker - InvoFlow Fast & Easy: create and send an invoice in under 30 seconds. Smart Templates: save and reuse clients, services, and items automatically. PDF Export: generate polished PDF invoices and share via email, WhatsApp, or AirDrop. Multi-Currency: support for USD, EUR, GBP, CAD, and many other currencies. Track Payments: mark invoices as Paid, Unpaid, or Draft and stay on top of your cash flow. Offline Access: create, edit, and save invoices even without an internet connection. Who it’s for Freelancers & Creators — send professional invoices to clients worldwide from your iPhone or iPad. Small Businesses — keep all customer invoices and payments organized in one simple app. Consultants & Agencies — duplicate recurring invoices in one tap for monthly or retainer clients. Contractors — generate legal-style PDF invoices on-site and share instantly with customers. How it works Tap “New Invoice” Add your client details and services/items Customize, preview, and export your PDF invoice Send and get paid faster That’s it — your invoice is ready to go in just a few taps. Key Features Invoice maker with smart auto-fill for clients and services Professional invoice templates Built-in PDF invoice generator One-tap quick duplicate for recurring invoices Add your business logo and signature Payment tracking dashboard for all invoices Local currency selection with multi-currency support Secure cloud backup (Pro) The application contains auto-renewable subscriptions and In-App Purchases: 1 week - $7.99 yearly - $39.99 Privacy Policy: https://pixooapps.com/invoice/privacypolicy/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

testo Smart4 screens
Invoice Maker3 screens

Verdict

The call

The clearest difference is rating: Invoice Maker at 5.0 against testo Smart's 2.7. Invoice Maker also leads on update cadence (monthly vs every 2 months) and iOS requirement (15.0 vs 18.0). testo Smart's advantage is ads (none vs shown) and ratings volume (167 vs 5). On price, in-app purchases, monetization model 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 Invoice Maker sells 2 in-app purchases, starting at $7.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Invoice Maker 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.

UpkeepUpdate frequency

testo Smart ships an update every 2 months, Invoice Maker monthly. The most recent releases landed on October 13, 2026 and September 24, 2026 respectively.

Scorecard5 real differences · 5 level
testo Smart versus Invoice Maker: the parameters behind the verdict, then further details
Parametertesto SmartInvoice Maker
PriceFreeFree
Rating2.7 (167 ratings)5.0 (5 ratings) — better
Positive reviews16.3% of reviews—
Number of ratings167 — better5
Update frequencyEvery 2 monthsMonthly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, iPod
Requires iOS18.015.0 — better
Further details — not scored
Size195 MB51 MB
Age rating4+4+
DeveloperTesto SE & Co. KGaAPixoo LLC

Customer experience

testo Smart

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

Invoice Maker

All ratings5 ratings
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

Invoice Maker

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
2 purchases

Invoice Maker

Subscriptions2
  • Invoice Maker - Weekly3 Days trial$7.997 Days
  • Invoice Maker - Yearly$39.991 Year

Questions

Is testo Smart free?
testo Smart is free to download, with in-app purchases available.
Is Invoice Maker free?
Invoice Maker is free to download, with in-app purchases available.
Which has better reviews, testo Smart or Invoice Maker?
Invoice Maker is rated higher. testo Smart averages 2.7 out of 5 from 167 ratings, while Invoice Maker averages 5.0 from 5 ratings.
Do testo Smart or Invoice Maker have ads?
Invoice Maker shows ads; testo Smart does not.
Which is updated more often, testo Smart or Invoice Maker?
testo Smart ships an update every 2 months, and Invoice Maker monthly. Most recently, testo Smart was updated on October 13, 2026 and Invoice Maker on September 24, 2026.

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