LinkComm vs CrowdMag
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LinkComm
This application allows users to communicate with specific OTT HydroMet dataloggers and transmitters. It enables viewing current status, downloading logged data, changing device setups, and performing diagnostic actions.
- View current status and measurement data
- Change device setup
- Download and graph logged data
- Perform diagnostics
- Supports Satlink3, X-Link, ecoLog 1000, SensorLink 1000
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LinkComm is an app used to communicate with Ott dataloggers and transmitters. Supported devices include Satlink3, X-Link, ecoLog 1000, and SensorLink 1000. With LinkComm you can: * View current status and measurement data * Change the setup * Download and graph the log * Perform diagnostics (e.g., send a command, set the time)
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.
- 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
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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 .
Screenshots
Verdict
The clearest difference is review sentiment: LinkComm at 100% against CrowdMag's 53%. LinkComm also leads on rating (4.7 vs 4.3). CrowdMag's advantage is ratings volume (24 vs 3). On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
LinkComm holds the better App Store score, 4.7 against 4.3. That said, the two scores are not equally well evidenced: CrowdMag has 24 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 100% of LinkComm's written reviews are positive against 53% of CrowdMag's.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 9, 2026 and September 22, 2026 respectively.
| Parameter | LinkComm | CrowdMag |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (3 ratings) — better | 4.3 (24 ratings) |
| Positive reviews | 100.0% of reviews — better | 52.9% of reviews |
| Number of ratings | 3 | 24 — better |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 114 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | OTT HydroMet Corp | University of Colorado Boulder |
Customer experience
LinkComm
CrowdMag
In-app purchases
LinkComm
No in-app purchases
CrowdMag
No in-app purchases








