Comparison

CrowdMag vs Compass Maps

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

CrowdMag

This app allows users to measure and contribute to scientific research on Earth's magnetic field using their smartphone. It offers features for recording magnetic data during various activities, including flights, and provides tools for data visualization and analysis.

Highlights
  • Measure magnetic field data
  • Contribute to scientific research
  • Record data during flights
  • Visualize data on maps and graphs
  • Magnetic calculator with WMM2020
  • Live magnetic compass
  • Export data via email/Google Drive
Features
Read full description

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 .

About

Compass Maps

Navigate with a digital compass that displays direction on a map. Features include real-time traffic, land area measurement, and location sharing. It utilizes GPS for auto-direction and allows map interaction.

Highlights
  • Digital compass on map
  • Real-time traffic maps
  • Land area measurement
  • Location sharing
  • GPS auto-direction
  • Satellite map mode
Features
Read full description

Maps compass - directional compass & digital is free the application to support show compass on the map, Traffic maps in real time, Land area measurement, show address on maps with satellite map mode and share location to networks social, email, sms or for any app you like. With GPS technology the application will auto direction compass for you. - You can move on maps , compass will auto update state and direction, It also can calculate radius, corner. show your current location on maps. zoom maps or share location with your friends *Note: + E is east + W is the west + N is the north + S is the south + SE is the Southeast + SW is Southwest + NE is North-East - You need to grant permission and turn on the GPS. Here is a request with any application that supports digital compass. The compass app depends on connecting to wifi/internet for your device exactly. If the compass works perfectly, it means that your internet is perfect, too. - Compass map: + Locate or calculate direction at anywhere appears on map + Move the compass by touching the location you want on the map. Some other feature for Compass Maps - Directional Compass application - Show True North - Show Magnetic Field Power - Level Error Correction - Connect To Google Map - Show latitude longitude - Show level Maps compass - Directional Compass also is a tool to measure calculators for measuring Land Area on maps easiest way. There is an inbuilt Unit Converter for measuring areas in various Land Units. Supported m2, km2, fit2 and ha. You can convert these units. Measure area between three points on map. The application will auto calculate and figure out the result. You can choose some types such as: hybrid maps, satellite, terrain maps... Land Area measurement easiest way tools. It allows you to use pivots to operate on maps. If you have any feedback to build maps compass - directional compass application. Please contact me via email: onedevzteam@gmail.com. We will research and improve it to become better for our smart compass application. Thanks. Privacy Policy: https://compassmaps.wordpress.com/here-is-privacy-policy/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

CrowdMag4 screens
Compass Maps4 screens

Verdict

The call

The clearest difference is in-app purchases: CrowdMag at none against Compass Maps's 2. Compass Maps's advantage is rating (4.6 vs 4.3) and ratings volume (670 vs 25). On price, review sentiment, update cadence and ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Compass Maps sells 2 in-app purchases, starting at $7.99 per year. CrowdMag asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Compass Maps holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: Compass Maps has 670 ratings behind it against 25, so its average is the more settled of the two. Written reviews point the same way: 53% of CrowdMag's written reviews are positive against 56% of Compass Maps's.

UpkeepUpdate frequency

CrowdMag ships an update every 2 months, Compass Maps every 4 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard4 real differences · 6 level
CrowdMag versus Compass Maps: the parameters behind the verdict, then further details
ParameterCrowdMagCompass Maps
PriceFreeFree
Rating4.3 (25 ratings)4.6 (670 ratings) — better
Positive reviews52.9% of reviews55.6% of reviews — better
Number of ratings25670 — better
Update frequencyEvery 2 monthsEvery 4 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size18 MB25 MB
Age rating4+4+
DeveloperUniversity of Colorado BoulderKIET NGUYEN TAN

Customer experience

CrowdMag

All ratings24 ratings
Positive79.2%
Neutral8.3%
Negative12.5%
Written reviews17 reviews
Positive52.9%
Neutral17.6%
Negative29.4%

Compass Maps

All ratings656 ratings
Positive90.9%
Neutral3.7%
Negative5.5%
Written reviews18 reviews
Positive55.6%
Neutral0.0%
Negative44.4%

In-app purchases

None

CrowdMag

No in-app purchases

2 purchases

Compass Maps

Subscriptions1
  • Remove Ads (Yearly)$7.991 Year
One-time1
  • Remove Ads – Lifetime$12.99

Questions

Is CrowdMag free?
CrowdMag is free to download, with no in-app purchases.
Is Compass Maps free?
Compass Maps is free to download, with in-app purchases available.
Which has better reviews, CrowdMag or Compass Maps?
Compass Maps is rated higher. CrowdMag averages 4.3 out of 5 from 25 ratings, while Compass Maps averages 4.6 from 670 ratings.
Do CrowdMag or Compass Maps have ads?
Neither CrowdMag nor Compass Maps shows ads.
Which is updated more often, CrowdMag or Compass Maps?
CrowdMag ships an update every 2 months, and Compass Maps every 4 weeks. Most recently, CrowdMag was updated on November 1, 2026 and Compass Maps on November 3, 2026.

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