CrowdMag app icon

CrowdMag

Use compass, get magnetic variation, record mag data and be a citizen scientist!

NOAA's National Geophysical Data Center · gov.noaa.ngdc.wmm2

Not rated yet 50K+ downloads v2.3.0 11.5 MB Android 5.0+ PEGI 3 · Everyone

  • Signature matches the Google Play version Details

At a glance

Latest version
v2.3.0 (173)
Updated
Aug 14, 2026 (2 months ago)
APK size
11.5 MB
Requires
Android 5.0+ (API 21)
CPU support
Any (no native code)
Graphics
OpenGL ES 2.0+
Category
Tools (app)
Listed since
Apr 22, 2021 (at least)
Permissions
12 (6 sensitive)
Website
ngdc.noaa.gov/geomag/crowdmag.shtml
Developer contact
[email protected]
Privacy
Developer's privacy policy

About this APK

CrowdMag is an app by NOAA's National Geophysical Data Center in the Tools category, listed since at least April 2021. It has no native code, so it runs on any Android processor.

It asks for 12 permissions, 6 of them sensitive, including precise location, location in the background and approximate location. It asks for the same permissions as version 2.2.6.

What's new in v2.3.0

* Fully migrating to University of Boulder Colorado Servers

Description

From the listing uploaded by “appupdater”.

Introducing CrowdMag's newest feature: Flight Mode, which lets you contribute to scientific research by measuring the magnetic field as you fly around the world. To get started, simply provide your itinerary on the CrowdMag app, and you'll be able to turn your flight into a scientific expedition. Check out this step-by-step tutorial for measuring data while flying: https://geomag.colorado.edu/crowdmag-flight-mode-tutorial . 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.

Version history

3 versions are listed, going back to v2.2.4.

All 3 versions

Security & authenticity

Security rating: Trusted

Signing certificate

  • Signature matches the Google Play version Checked by the source store on Aug 14, 2026.
  • Certificate issued to “Nir Boneh” This is the certificate of the Google Play version.
  • Same certificate as the 2 other versions checked

Store checks and file details

  • Developer signature verified Aug 14, 2026
  • Validated against Google Play Aug 14, 2026
  • Signed byCN=Nir Boneh
  • Signing certificate (SHA-1)42:E1:34:33:3D:3F:DB:8F:9C:19:5F:5B:0E:2C:B6:99:70:D0:9F:B6
  • File MD5a9e372f80a099604fd5692e02f176f9a
  • Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (12)

CrowdMag requests 12 permissions, 6 of them sensitive.

Required hardware & features

CrowdMag APK: questions and answers

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is the CrowdMag APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the 2 other versions checked. After downloading, check that the file's MD5 is a9e372f80a099604fd5692e02f176f9a.

Tags

More Tools apps