CrowdMag
CrowdMag is made and published by University of Colorado Boulder. AppBrain is an independent app data site and isn't affiliated with University of Colorado Boulder. The app name, icon, screenshots and description belong to University of Colorado Boulder and are shown as published on the App Store.
AppBrain's verdict
Established- Rating on App Store
- 4.32
- 25 ratings
- Last updated
- August 14, 2026
- Size
- 17.6 MB
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Store listing
By University of Colorado Boulder, from the App StoreDescription by University of Colorado Boulder Written by the developer, not by AppBrain. Click to read.
CrowdMag is an app that lets you measure the local magnetic field using your smartphone. You can view the data as a graph or a map in nanotesla units. CrowdMag measures the Z (downward component), H (horizontal intensity), and F (total intensity) magnetic field components. You can use CrowdMag for measuring magnetic data during outdoor activities, while flying, or to conduct your own experiments. You can also share it with NOAA to help scientists better understand Earth's magnetic field.
If you're going for a walk, run, or other outdoor activities, you can use CrowdMag to measure the magnetic data along your path and save it as a "magtivity." And, if you get a new phone, don't worry! You can export a backup of your CrowdMag data and save it on your computer. This way, if you have to reset your phone or switch to a new one, you can import your backup and continue using CrowdMag without losing your data or progress.
CrowdMag also has a magnetic calculator that provides magvar (declination), the magnetic field's dip angle, total magnetic field, and other magnetic field components based on the latest World Magnetic Model (WMM2020). Some of the other features of CrowdMag include creating your own magtivities, customizing recording frequency and location accuracy, exporting your data via email or Google Drive, and seeing generalized crowdsourced magnetic data from other users.
And, before we forget, CrowdMag also features a compass that distinctly shows both true and magnetic north. As an added feature, the compass also has a 3D display with an optional audio output - check it out!
CrowdMag features:
* Create your own magnetic activity (called a "magtivity")
* Measure data while flying
* Customize recording frequency and location accuracy to your preferences
* View your magnetic data on an interactive Google Map
* Graph your data as a time series line chart
* Check the quality of your data by comparing it with the World Magnetic Model (WMM)
* Export your data as a CSV file
* Clear stored data on your phone when you want to start fresh
* Choose to share your data with NOAA (optional)
* See generalized crowdsourced magnetic data from other users
* Use the live magnetic compass for 2D and 3D rendering
* View information about the current solar magnetic disturbance
* Use the most up-to-date magnetic field model (WMM2020)
* Export your data via email, Google Drive, or other options
* Export a CrowdMag backup to save your contributions' status and data
* Import your CrowdMag backup (works across different phone platforms)
Visit https://geomag.colorado.edu/crowdmag to see crowdsourced magnetic data .
Safety and technology
Found in the app by AppBrain- Price
- Free
- App size
- 17.6 MB
- Content rating
- Everyone
Technologies used by CrowdMag
Releases
Updates seen on the App Store- Version
- 2.3.0
- Launched
- October 2014
No changelog data
Alternatives
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Rankings
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About the app and developer
About CrowdMag
CrowdMag is an utilities app developed by University of Colorado Boulder.
What is the rating of CrowdMag?
CrowdMag is rated 4.32 out of 5 stars, based on 25 ratings.
Is CrowdMag free?
CrowdMag is free. The app size is 17.56 MB. The latest version available is 2.3.0. The last update was on August 14, 2026.
What are the requirements for CrowdMag?
The app has a content rating of Everyone. The app has been available on the App Store since October 2014.
Developer information for University of Colorado Boulder
University of Colorado Boulder
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