testo Smart User Reviews

Customer Experience

Positive experience15.8% of reviews
Neutral17.8% of reviews
Negative experience66.4% of reviews

~ Based on 146 written reviews from the US App Store.

What users say

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 165 user ratings, with an App Store average of 2.7/5.

Safety Analysis

36.4% of ratings point to a safe experience
12.7% of ratings suggest some concerns
50.9% of ratings point to a risky experience

~ Based on 165 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 85/100.

Based on 85 of 100 points across 7 verification signals from App Store and developer data.

Top reviews

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.
Show more

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 .

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 !
Show more

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.
Show more

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.

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.
Show more

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.
Show more

Worst

Very bad update; didn’t expect that from Testo

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

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
Show more

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.
Show more

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.

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.
Show more

Business owner

I connect my new Testo 410i anemometer to the app when it actually decides to connect and proceed to preform a duct flow scan. The software then alerts me to first connect to a device while simultaneously showing me velocity and temp readings from the device I’m already connected with. On one occasion (after many attempts) the software actually allowed me to proceed to the scan but this is in no way repeatable. This may be a case where a good product is ruined by horrible software.
Show more

Response from developer

Hello, could you please describe in a bit more detail how you try to connect the testo 410i to the testo Smart App? Do you open the app first, then switch on the testo 410i and wait a few seconds until a pop‑up appears informing you that a device has been detected and asking whether you would like to connect? After this, which measurement programme do you select? If it’s easier for you, you can also write to us at appsupport@testo.de. We’re happy to support you and will do our best to help. Your Testo App Team

Painful to use

Testo smart app is a pain to use. I don’t understand why every time you use the app it has to download again. This never use to be this way.

New User

This app is not Smart in my opinion and the support has been poor as well. I have been using it for balancing air systems and not worth the money ! Zero stars no an option so one star from me until they sort out some fundamentals and their marketing !

No more “temperature IR”?

Got given a testo 805i as a gift, extremely excited to use if for surface temp measurements and pictures as is described in every app tutorial that hasn’t been updated in the last 9 years, only to open the app and have no temperature IR setting available to allow me to take measurements and pictures.
Show more

Klappt nicht immer

Benutze es zum speichern der Abgasmesswerte. Was ich sehr gut finde da ich die Berichte per Mail an den Kunde schicke und ich so die Messwerte auch mit schicken kann. Nur leider klappt zur Zeit als fast nicht die Verbindung. Beim öffnen der App wird nach der Verbindung gefragt und dann tut sich Nix mehr, am IPad zeigt es das wlan an. Aber es kommt keine Verbindung zustande. Was sehr schade ist. Habe mir extra das testo gekauft das ich sie Funktion habe.
Hoffe es klappt beim nächsten Update wieder besser
Show more

Ne tient pas ses promesses

Débit volumétrique ne fonctionne pas

“Smart”

It’s not, really.
The app, for tightness testing, doesn’t work anything like what is expected in standards or ACOP. You will waste approx three times test periods trying to get it zeroed and then it’ll start before pressure can be introduced.
Only if there’s nothing wrong with the equipment, of course which proved as reliable as the app.
Show more