# CrowdMag vs DischargeKeeperApp

CrowdMag and DischargeKeeperApp are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | CrowdMag | DischargeKeeperApp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (25 ratings)](https://appshunter.io/ios/app/crowdmag/id910578825/reviews)** | — |
| Number of ratings | **25** | — |
| Positive reviews | 52.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Monetization | Free | — |
| Size | 18 MB | 39 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [University of Colorado Boulder](https://appshunter.io/developer/972210292) | [photrack](https://appshunter.io/developer/6810728516) |

## What reviewers say

### CrowdMag

[App page](https://appshunter.io/ios/app/crowdmag/id910578825)

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:** macOS Compatibility

**In-app purchases:** none


### DischargeKeeperApp

[App page](https://appshunter.io/ios/app/dischargekeeperapp/id6810728514)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is CrowdMag free?

CrowdMag is free to download, with no in-app purchases.

### Is DischargeKeeperApp free?

DischargeKeeperApp is free to download, with no in-app purchases.

### Do CrowdMag or DischargeKeeperApp have ads?

Neither CrowdMag nor DischargeKeeperApp shows ads.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*