PAAT vs MagMapper!
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
PAAT
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PAAT was developed to enhance the capabilities of States in assessing radiation alarms triggered by a person. In most cases, the reason the person will set off an alarm is a medical treatment or diagnostic procedure involving the administration of a radiopharmaceutical. When a radiation alarm is triggered by a person, PAAT can be used by the investigating officer to conduct a simple interview and measurement. The information in the App provides assistance for the investigating officers in States in the assessment of radiation alarms caused by persons to more effectively and efficiently combat the movement of nuclear and other radioactive materials out of regulatory control at points of entry and major public events (MPE). Note: β’ The App does not collect any identifying personal data. β’ The dose estimates in the App are for standard models and should not be considered patient-specific under any circumstances. β’ The assessment results shall be used only for nuclear security purposes. β’ The App has not been extensively tested on all platforms, under all conditions. As such, users of this tool must verify all results prior to decision making.
MagMapper!
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MagMapper: Locate Abandoned Well Casings with Your Smartphone In the United States, hundreds of thousands of oil and gas wells have been abandoned or βorphanedβ. Locating these wells is the first step towards properly plugging them, but traditional geophysics survey equipment is expensive and requires specific training to use. MagMapper puts well-detection technology in your pocket. With a simple walking survey, MagMapper utilizes the magnetometer built into your phone to create a magnetic anomaly map. With no additional hardware you can detect buried well casings. How it Works Walk a grid pattern over the desired survey area with the MagMapper app running. The app logs magnetometer readings and GPS position, then processes that data into a magnetic intensity map. Steel well casings create distinctive magnetic anomalies allowing users to pinpoint well locations from the walking survey. Who itβs for State and Federal agencies conducting field surveys and orphaned well inventories Landowners looking for undocumented wells on their property Environmental Research and Field Technicians Citizen Scientists! Key Features Real-time magnetic field visualization GPS tagged survey data for mapping Exportable survey data for further analysis (CSV file) Gamification Leaderboard: Compare your contributions with other citizens. Climb the leaderboard by completing quality surveys Achievements & Badges- Earn badges for milestones like completing your first survey, finding anomalies, or becoming a top contributor. Activity Scoring- Your activity score reflects both the quantity and quality of your surveys. Stay active to maintain your ranking! MagMapper has been compared against research grade magnetometer equipment, including helicopter and ground-based magnetometer surveys to evaluate detection accuracy and appropriate survey line spacing. The MagMapper project is funded by the U.S. Department of Energy (CATALOG program) MagMapper is developed by the CIRES MagMapper team at the University of Colorado Boulder. Website: https://www.magmapper.app/
Screenshots
Verdict
The clearest difference is update cadence: MagMapper! at every 5 days against PAAT's every 3 weeks. PAAT's advantage is iOS requirement (13.0 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
PAAT ships an update every 3 weeks, MagMapper! every 5 days. The most recent releases landed on October 16, 2026 and October 25, 2026 respectively.
| Parameter | PAAT | MagMapper! |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Every 5 days β better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 13.0 β better | 17.6 |
| Further details β not scored | ||
| Size | 11 MB | 144 MB |
| Age rating | 4+ | 4+ |
| Developer | IAEA | University of Colorado Boulder |
In-app purchases
PAAT
No in-app purchases
MagMapper!
No in-app purchases









