testo Smart User Reviews

Name: testo Smart
Rating: 2.7 (167 reviews)

testo Smart

Testo SE & Co. KGaA

🔧 Utilities

📊 Productivity

Customer Experience

Positive experience16.3% of reviews

Neutral17.6% of reviews

Negative experience66.0% of reviews

~ Based on 153 written reviews from the US App Store.

What users say

Summarized from real user reviews of testo Smart. Based on 167 reviews and a 2.7/5 average, it highlights the 3 positives and 8 negatives reviewers mention most about this Productivity app.

Positive things

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

Negative things

🐛App won't connect
🐛Connectivity issues
🐛Unreliable connection
🐛Forced updates
🐛Laggy and unresponsive UI
🐛Crashes and bugs
🐛Doesn't work as expected
🐛Poor app design and functionality

Is testo Smart Safe?

testo Smart has mixed safety signals based on user ratings. AppsHunter Safety Score for testo Smart is 56/100.

This assessment is based on 167 user ratings, with an App Store average of 2.7/5.

Safety Analysis

35.9% of ratings point to a safe experience

13.2% of ratings suggest some concerns

50.9% of ratings point to a risky experience

~ Based on 167 App Store ratings for testo Smart.

Is testo Smart Legit?

testo Smart appears to be a legitimate app. AppsHunter Legitimacy Score for testo Smart is 95/100.

Based on 95 of 100 points across 7 verification signals from App Store and developer data.

Top reviews

Most Recent Highest Rated Lowest Rated

Testo 550s @ Apple

we recently began using the 550S combined with the smart app. While the 550s works very well as a stand alone manifold the app is doesn’t generate reports or show the pressures at the top of the screen. The only work around we have found is screen recordings if you’re using iPad or an iPhone. The pressures are shifted to the bottom of the screen into small blocks. The lack of its ability to generate reports is a deal breaker for us. The app does not work as advertised. It’s a shame really the instrument it’s self works great. If your team requires proof prior to new unit commissioning. This app is not for you.

Darkhorses44

a month ago

Response from developer

Hi, Thank you for your honest and detailed feedback. We are sorry to hear that the testo Smart App is currently not meeting your expectations, especially when it comes to generating reports and displaying the pressure values. Could you please tell us what happens when you try to generate a report? Do you receive an error message, or is the report option unavailable? If possible, please send us a screen recording or screenshots showing the issue at appsupport@testo.de. This would help us investigate the problem and support you more effectively. We would be very happy to look into this and assist you further. Best regards, Your Testo App Team

Connection impossible

Il m’est impossible de voir le Testo 405i depuis mon iphone 15 ( aucune apparition sur le bluetooth)

Thomas405i

2 months ago

Response from developer

Bonjour, Veuillez ne pas rechercher le testo 405i dans les réglages Bluetooth de votre iPhone. Ouvrez plutôt l’application (Bluetooth activé) et attendez un instant après avoir allumé le testo 405i. Un message contextuel devrait alors s’afficher pour indiquer qu’un instrument de mesure a été détecté. Cliquez sur le bouton « Connecter l’instrument de mesure ». Est-ce que cela a fonctionné ? Votre équipe Testo App

Chiller tech

Are you guys going to add refrigerant R-514 for the new low pressure centrifugals? Please add it

Thank you

Chiller god

3 months ago

Works as it should

Good app and love my 558s. Haven’t had an issue with app, gauges, probes, micron gauge, etc.. glad I went testo over fieldpiece

matts5664

3 months ago

More like this please

I needed a handheld air flow meter that allowed for a wide range to verify built in instrumentation. Feel like I found gold in the 510i manometer. It has no screen, only a light and a button. All readings feed through this app which i configure and feed identifiers to. The exported csv files include everything making my documentation work easy as can be.

I don’t know why i need one of these manometers for home, but i want one. Probably should avoid looking at FLIR tools while i still have a checking balance.

XedBrite

4 months ago

Response from developer

Hi, thank you very much for your 5-star rating and your kind words. We’re delighted to hear that you’re happy with the app and the testo 510! 🤩 Your Testo App Team

Paul

This app could be soooooo good yet it falls down on the basics . I use it for lev testing of dust drops and There is nowhere to put a drop number. You have to put it in the information. Which ok at least it’s in the paperwork. But then you go back to the list and it only shows the customer time and date in the list NO information. So I spend hours trying to search for pod 10 out of 50 pods. It’s so frustrating. The only way to get around it is to export and name each file after a pod but if you name one wrong or miss one, you try find it in the list? Such a shame. It just doesn’t let you rename a save file and save it in the app. That’s all it needs to do

baweld123

4 months ago

Einloggen

☹️Es nervt einen nach jeden Ende meldet sich die App automatisch ab.
Ständiges Einloggen macht keinen Sinn.
Es wäre auch sinnvoll diese App im offline Modus zu benützen.
Wenn man solche teuern Geräte von Testo kauft erwartet man auch eine 100% App dazu .

Clear24

4 months ago

Response from developer

Hallo, was für ein Testo-Messgerät nutzen Sie von Testo? Was meinen Sie genau mit Offline-Modus? Die App nutzen zu können ohne angemeldet zu sein? Oder ohne Internetverbindung? Vielen Dank und viele Grüße, Ihr Testo App Team

App ist nicht einwandfrei!

Das Messgerät an sich ist super wenn man den Akku mal außer Betracht lässt .
Allerdings die App ist eine reine Katastrophe. Wie schon öfters hier beschrieben verbindet sich das Messgerät nur nach mehrmaligen An und Ausschalten mit der App .
Da wir ein Fachbetrieb sind und uns für das Produkt entschieden hatten ist es für uns umso ärgerlicher ,dass das Digitalisieren nur erschwert möglich ist . Warum nur einen Stern vergeben wird hat den Hintergrund , dass man beim Service nicht für Ernst genommen wird und Aussagen getätigt werden wie „ Dies ist uns nicht bekannt versuchen Sie die App auszulagern und wieder zu installieren „ .
Da fragt man sich lesen Sie ihre eigenen Bewertungen nicht ?!
Als letzten Versuch waren wir beim Testo Stand auf der SHK Messe dort wurde genau dasselbe von sich gegeben . „So etwas wäre nicht bekannt man wird belächelt und man könne nicht weiterhelfen ! „
Absolute Frechheit meiner Meinung nach ein Unfertiges Programm bzw. App auf den Markt zu bringen !!
Ich hoffe sehr ,dass es bald ein Update gibt und die Probleme behoben werden !

DasHandwerk

4 months ago

Does not work with the testo 300

Maybe this app works with other devices but it does not work with the testo 300

$&@?!(8949;&’djs

5 months ago

Is anyone actually working on this?!

This has to be the worst app for refrigeration I have ever used. Do the developers actually use the stuff they produce?! There's no way to pre configure which data is displayed on the graphics?! Are you kidding me?! Do you know how much time I have wasted researching high pressure, sub cooling, and liquid line temperature because the stupid defaults are useless to me?!? This is beyond frustrating. Every other app I have used for other manufacturers tools is more configurable and makes sense from a technicians perspective. The testo hardware itself is great-- this app makes me regret ever buying it though! I wish I knew the Bluetooth protocols involved -- I bet I could vibe code a replacement that blows this app away in a weekend.

Sethmeisterg

5 months ago

Favorites 557s

Changing favorite refrigerants doesn’t “stick”. You remove one and it just goes back to a favorite. Since you can only have 5 I can’t add any which means I spend a ton of time on jobs scrolling through refrigerants. Restore to factory settings on the gauges retains the favorites from the app (with the app closed and phone not connected). I wanted to get something better but guy on marketplace that wanted to buy them has the same problem and I refunded him because he claims the product (or app) is defective.

CynicX

5 months ago

Response from developer

Hello! Thank you for bringing this to our attention. We're sorry to hear about the issues with the favorite refrigerants not saving properly. This is clearly frustrating, especially when you're working on-site. We'd like to investigate this issue further. Could you please contact us at appsupport@testo.de. Thank you for your patience. Best regards, Your Testo App Team

Super outils

Génial pour observer et pouvoir analyser le fonctionnement. Un point qui pourrait être intéressant, pour les sondes de pression, c’est d’avoir les températures avec les pressions d’affichées. Ça concerne les sondes 549i. En application froid, elle affiche une pression seulement.

Olmy75

6 months ago

Response from developer

Bonjour, merci beaucoup pour votre évaluation 4 étoiles, cela nous fait vraiment très plaisir. Quelles sondes et quel programme de mesure utilisez-vous exactement dans l'application ? Votre équipe Testo App

App won’t connect

I have a new set of 557s and the app won’t connect. Used to work fine. I first posted this in June of 2025, now it’s March of 2026. Both the Gauges and iPhone have the latest updates. Still doesn’t work. And no it doesn’t show up in the available to connect list, everything else does. The probes connect, old gauges connect. Testo has gone down hill.

Street8487

7 months ago

Good App with some work

This is a really handy app, I just wish they would tidy up the customers and measurements sites portion of it. You cant see measurements when you go into customers section, and it easily gets messy trying to save several measurements for different boilers or extracts on the same site. Constantly going back and forth between customers and saved data.

If this was sorted I’d give it 5 stars.

Joeyhaskett

7 months ago

Worst

Very bad update; didn’t expect that from Testo

Anti Testo

7 months ago

Sign in limited use

This app is horrible I hardly use them it says limited use only there is nowhere on app settings for what it asks for even after updating

Youonlytakegoodreviews

7 months ago

Tightness Test Protocol

Hi, I really like the app and how it connects to my flue analyser and I use the smart probes to perform tightness testing, however the let by test sequence is in another protocol and not incorporated into the tightness test section, can this be incorporated in an update with the option to skip let by if already passed? Thanks,
Chris

Chris Gutteridge

8 months ago

Testo App iPhone

Hi guys, since you updated (few months ago) so frustrating that every time I open the app im confronted with a splash screen suggesting to download the ‘NEW TESTO SMART APP’
Seriously im up to date, so why dont you program the app to check its version and if its the latest, then bypass this screen. If this is happening to all uses there must be a lot of other frustrated users globally! Please fix.
Also do you think there may be a way to increase the ability for Testo blue tooth devices to have a bit more range? So frustrating moving only a few meters from gauges to be disconnected. Additionally almost always after disconnect I need to close the app and restart 🙄 loosing any data I may require.
These tools are not cheap, please try to show some sense of pride in your R&D and fix these oversights.

FillyD6491

8 months ago

Response from developer

Hi, regarding the splash screen issue: have you tried completely uninstalling the app from your iPhone and reinstalling it fresh from the App Store? If you have saved data, you can export it as a backup file beforehand and import it again afterwards. This was a known bug that was fixed two years ago, but to apply the fix, you will need to uninstall and reinstall the app. How far away are you when the connection is lost? Normally, after a brief disconnection, the app and gauges reconnect automatically, with measurement data only missing for the duration of the disconnection. It sounds like this is not the case for you. Would it be possible for you to send us a system report file? Please get in touch with us at appsupport@testo.de. Best regards, Your Testo App Team

“Smart”

It’s not, really.
The app, for tightness testing, doesn’t work anything like what is expected in standards or ACOP.
Excellent for dynamic pressure testing in awkward places, however.

Such h D h bbk

8 months ago

In app purchases now

Bought the whole kit for refrigeration and hvac measurements that were already very expensive to begin with. One of the most handy features was being able to do CFM readings with the hot wire anemometer. Go to do one today and find out I now need to subscribe monthly or yearly to be able to use that feature of the tool. Will be selling the probes and buying a different brand standalone for these measurements.

MBills3

8 months ago

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📊 Productivity

testo Smart User Reviews

Customer Experience

What users say

Positive things

Negative things

Is testo Smart Safe? 🙏

Safety Analysis

Is testo Smart Legit? ✅

Top reviews

Testo 550s @ Apple

Response from developer

Connection impossible

Response from developer

Chiller tech

Works as it should

More like this please

Response from developer

Paul

Einloggen

Response from developer

App ist nicht einwandfrei!

Does not work with the testo 300

Is anyone actually working on this?!

Favorites 557s

Response from developer

Super outils

Response from developer

App won’t connect

Good App with some work

Worst

Sign in limited use

Tightness Test Protocol

Testo App iPhone

Response from developer

“Smart”

In app purchases now

Alternatives

Is testo Smart Safe?

Is testo Smart Legit?