testo Smart vs Tunnel.ai
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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- 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
Tunnel.ai
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## Description (4000 chars max) Tunnel.ai turns your train of thought into text, wherever you are, even when the train is in a tunnel. It is built to catch a thought the moment it lands, with as little friction as possible. Tap once and talk. Everything runs on your device, so there is no account, no cloud, and no internet needed after the first launch. Your audio never leaves your phone or Mac. CAPTURE WITHOUT BREAKING YOUR FLOW • Record over your music. Start a note without pausing your music, podcast, or call. Tunnel.ai captures your voice on top of whatever you are already listening to, so you can talk through a follow-up while the track keeps playing, then get on with your day. • Keep recording when you switch apps. Jump to your notes or calendar to check a name mid-thought and the recording keeps rolling, so nothing gets cut off. • Fully offline. Planes, trains, basements, dead zones. The model lives on your device, so a signal is never required. WHY ON-DEVICE MATTERS • Private by architecture. There is no server, so we could not read your notes if we wanted to. • No subscription. Nothing to renew, because there are no cloud costs to cover. WHAT IT DOES • Tap once, talk, tap again. Your words appear as a note. • Confidence highlighting. Words the model was unsure about show in orange. Tap one to correct it. • Custom dictionary and vocabulary. Teach it the names and jargon you actually use, once, so it hears colleagues, brands, and technical terms right. • AI Cleanup on supported devices. An optional on-device pass that fixes misheard names using your own word list. Still nothing leaves the device. • Audio kept with every note. Replay a recording, or re-transcribe it any time, for example after improving your dictionary. • Edit, copy, share, search. Transcripts are plain text, ready for wherever they need to go. Powered by open-source speech recognition (Whisper, via WhisperKit), accelerated by Apple silicon. Requires iPhone with iOS 17 or later. [iPhone listing] Requires a Mac with Apple silicon (M1 or later) and macOS 14 or later. [Mac listing] The transcription model is built in, so it works from the first launch with no download.
Screenshots
Verdict
The clearest difference is in-app purchases: Tunnel.ai at none against testo Smart's 5. Tunnel.ai also leads on update cadence (every 9 days vs every 2 months). On price, ads, device support and iOS requirement 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
Both are free to download. testo Smart sells 5 in-app purchases, starting at $6.99 per month. Tunnel.ai asks for nothing beyond the download.
testo Smart ships an update every 2 months, Tunnel.ai every 9 days. The most recent releases landed on October 29, 2026 and October 12, 2026 respectively.
| Parameter | testo Smart | Tunnel.ai |
|---|---|---|
| Price | Free | Free |
| Rating | 2.7 (170 ratings) — better | — |
| Positive reviews | 16.3% of reviews | — |
| Number of ratings | 170 — better | — |
| Update frequency | Every 2 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, Mac |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 195 MB | 148 MB |
| Age rating | 4+ | 4+ |
| Developer | Testo SE & Co. KGaA | Pierre Paslier |
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
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- Improve multi-probe support
- Integrate more features from physical devices
Tunnel.ai
Not enough reviews yet to summarise bugs or requests.
In-app purchases
testo Smart
- Multi-site measurement7 Days trial$6.991 Month
- Air balancing7 Days trial$9.991 Month
- Multi-site measurement$69.901 Year
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- Air balancing$99.901 Year
- Logging digital manifold$44.99
Tunnel.ai
No in-app purchases









