HEAT3D Pro vs Decibel Meter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HEAT3D Pro
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Heat3D allows you to precisely measure heat flow and U-values of building elements using a low-cost, quick and non-invasive method. Heat3D is designed to work on iPhones and iPads and uses a portable thermal camera to obtain results in an hour as opposed to days or weeks using heat flux plates. The rapid nature of the measurement enables quantified U-values that are more accurate than manual calculation methods but achievable in a similar amount of time. The Heat3D iOS app uses Apple ARKit to detect room features such as walls, floors and ceilings and construct a 3D model. When combined with a FLIR portable camera, infrared thermal images are projected onto the 3D model showing the heat signature through each surface. Quantitative infrared thermography is used to calculate the heat loss or gain through these surfaces and calculate the U-value. Measuring an accurate U value across an entire element with Heat3D can take as little as 1-hour meaning that the measurement of actual U-values is now possible in all projects. There is short video demonstrating how to use HEAT3D to capture a 3D energy survey of a room in 1 minute on the HEAT3D website - https://heat3d.net Why measure U-values using Heat3D? -Improved EPC accuracy Use the measured U value in EPC reports as opposed to calculated ones that can be +/-50% or more out. -Determine insulation levels Understand baseline thermal transmittance of walls and current insulation levels, allowing better target investment in insulation upgrades. -Retrofit improvement Measure before and after insulation upgrades or retrofit works to determine the true energy, running cost and CO₂ savings delivered by improvements. -Check quality assurance Check that the actual performance meets the designed performance. Identify poor installations, workmanship and conduct quality assurance testing. -Reduced remedial work Measure during works and before completion to check that desired outcomes are being achieved. Save time, costs and improve quality by identifying issues and reducing remedial action. Who is Heat3D designed for? Heat3D can be used by anyone who wants to know the U-value or thermal performance of building elements in-situ. Measurements can be taken before, during and after insulation upgrades to verify performance improvements; Architects, Building Managers, Building Surveyors, Energy Assessors, House Builders, Insulation Installers, Retrofit Coordinators, Sustainability Consultants A GPS enabled iPhone or iPad device with ARKit is required ( Wifi only iPad is not supported). You’ll need a FLIROne® camera. We recommend using the FLIR One Pro if possible, it will produce more accurate measurements and with higher resolution. An enviromental and a radiative temperature target is required to achieve ISO 9869 part 2 accuracy with HEAT3D Pro. Please contact business@electricpocket.com for advice on obtaining these. ARKit Compatible devices iPhone 8 and later iPhone X and later iPad (2019) and later Heat3D is the product of years of research and real-world testing into quantitative infrared thermography techniques. It has been successfully tested and proven in the lab and over 24 buildings of varying construction and age and shown to provide the same level of accuracy for heat flow and U value measurements as the very expensive and time consuming ISO 9869 standards approved HeatFlux plate method. Acknowledgements:- The research and development behind HEAT3D was part funded by Innovate UK and supported by the Energy Houses at Salford University. Privacy: https://electricpocket.com/privacy.html
Decibel Meter
Easily measure sound levels with this accurate and intuitive tool. It displays current, maximum, and average decibel values, along with a graphical overview for quick comprehension. This utility is completely free to use.
- Simple and easy to use
- Quick and accurate dB measuring
- All-in-one meter
- Maximum, current, and average values
- Gauge meter display
- Values displayed in graph
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Understand the sound levels around you with a clear live meter, responsive graph, and session recording. FREE FEATURES • Live estimated sound-level readings • Current, minimum, average, and maximum values • Real-time history graph • Manual calibration offset • Recording playback PREMIUM FEATURES • Ad-free measuring • Advanced response-time options • Additional frequency modes • Automatic recording saves • Saved measurement history Decibel Meter uses your device microphone only while measuring. Phone microphone readings are estimates and are not a substitute for a calibrated professional sound-level meter or workplace safety equipment. Subscription pricing and trial availability are shown before purchase and may vary by region. Subscriptions renew automatically unless cancelled in your App Store account settings. Terms of Use: https://www.devnex.nl/terms Privacy Policy: https://www.devnex.nl/privacy-policy.html
Screenshots
Verdict
The clearest difference is price: Decibel Meter at Free against HEAT3D Pro's $690.00. Decibel Meter also leads on update cadence (every 6 weeks vs every 4 months). HEAT3D Pro's advantage is in-app purchases (none vs 4) and ads (none vs shown). On 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
Decibel Meter is free to download; HEAT3D Pro costs $690.00 up front. Decibel Meter sells 4 in-app purchases, starting at $1.99 per 7 days. HEAT3D Pro asks for nothing beyond the download.
HEAT3D Pro ships an update every 4 months, Decibel Meter every 6 weeks. The most recent releases landed on October 16, 2026 and October 24, 2026 respectively.
| Parameter | HEAT3D Pro | Decibel Meter |
|---|---|---|
| Price | $690.00 | Free — better |
| Rating | — | 4.6 (719 ratings) — better |
| Positive reviews | — | 56.7% of reviews |
| Number of ratings | — | 719 — better |
| Update frequency | Every 4 months | Every 6 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 16.1 |
| Further details — not scored | ||
| Size | 125 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | Electric Pocket Limited | Devnex |
Bugs and requests
HEAT3D Pro
Not enough reviews yet to summarise bugs or requests.
Decibel Meter
Reported bugs
2 issues- Unable to close the app or cancel Google requests
- Recordings not saving despite claims of free saving
Requested features
3 requests- Add ability to save/export recordings
- Provide more customization options (weighting, etc.)
- Improve stability and reduce crashes
In-app purchases
HEAT3D Pro
No in-app purchases
Decibel Meter
- Weekly subscription3 Days trial$1.997 Days
- Monthly Subscription$2.991 Month
- Weekly Subscription3 Days trial$3.997 Days
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- Half-Yearly Subscription$9.496 Months









