Teslameter. vs OpenRadiation
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Teslameter.
This utility app measures electromagnetic fields around you using your device's compass. It displays readings on X, Y, and Z axes in micro-teslas, along with a magnitude reading. Primarily for entertainment, it detects interference from magnetic objects or potential paranormal activity.
- Measures electromagnetic fields
- Displays X, Y, Z axis readings
- Calculates magnitude reading
- Detects magnetic object interference
- For entertainment purposes
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Teslameter lets you view current electromagnetic fields around you! To use, simply open Teslameter and bring your iPhone close to any ferromagnetic metal such as iron or steel, or any other magnetic object. Teslameter will measure the current magnetic fields on the X, Y, and Z axis in micro-teslas. In addition Teslameter displays a magnitude reading of (X^2+Y^2+Z^2). How exactly does it work? Since the iPhone 3GS/iPhone 4 includes a compass, Teslameter can measure the interference created by a ferromagnetic metal (or paranormal activity). Teslameter is NOT a true teslameter and shouldn't be used for anything but entertainment purposes.
OpenRadiation
Measure ambient radioactivity levels and assess your exposure to ionizing radiation using a compatible sensor. Contribute to a citizen science project by sharing your measurements to build a collaborative database.
- Measure radioactivity levels
- Assess radiation exposure
- Contribute to citizen science
- Collaborative data database
- Share measurements
- View data online
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Looking to know the level of radioactivity around you and assess your exposure to ionising radiation? Thanks to this application, and a compatible sensor, you can measure radioactivity. You can also contribute to a citizen science project, by helping to create a collaborative data base of radioactivity measurements in the environment: OpenRadiation (published under an Open Database License). You will then be able to share your measurements using the application and view the data in the application or on the website www.openradiation.org. Create an account on the website www.openradiation.org, and obtain a compatible sensor (see the list of compatible sensors at www.openradiation.org). Activate Bluetooth under your mobile, configure your sensor to measure radioactivity, and publish your measurements. If you do not have a compatible sensor, you can always enter your measurements manually on the website or via the application. OpenRadiation currently brings together the following scientific and academic partners: IFFO-RME - training network in major educational risks -, IRSN - public expert in research and expertise on nuclear and radiological risks -, Planète Sciences – association contributing to the scientific and technical culture of young people - and SORBONNE UNIVERSITE Fablab - digital fabrication and rapid prototyping workshop, open to students, staff and the general public.
Screenshots
Verdict
The clearest difference is in-app purchases: OpenRadiation at none against Teslameter.'s 1. OpenRadiation also leads on ads (none vs shown) and update cadence (every 3 months vs every 12 months). Teslameter.'s advantage is iOS requirement (12.0 vs 15.0). On price, rating, review sentiment and ratings volume 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. Teslameter. sells 1 one-off in-app purchase. OpenRadiation asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 2.0 for Teslameter. against 2.0 for OpenRadiation. Both are backed by a comparable volume of ratings — 3 and 4 respectively. Written reviews split almost evenly too, at 0% and 0% positive.
Teslameter. ships an update every 12 months, OpenRadiation every 3 months. The most recent releases landed on June 9, 2026 and June 1, 2026 respectively.
| Parameter | Teslameter. | OpenRadiation |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (3 ratings) | 2.0 (4 ratings) |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| Number of ratings | 3 | 4 — better |
| Update frequency | Every 12 months | Every 3 months — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 14 MB | 54 MB |
| Age rating | 4+ | 4+ |
| Developer | margaret kovatch | Autorite de surete nucleaire et de radioprotection |
Customer experience
Teslameter.
OpenRadiation
In-app purchases
Teslameter.
- Remove Ads$1.99
OpenRadiation
No in-app purchases
Questions
Is Teslameter. free?
Is OpenRadiation free?
Which has better reviews, Teslameter. or OpenRadiation?
Do Teslameter. or OpenRadiation have ads?
Which is updated more often, Teslameter. or OpenRadiation?
Other comparisons
