# CrowdMag vs TankPlanH2O

The clearest difference is update cadence: TankPlanH2O at every 2 weeks against CrowdMag's every 2 months. On price, ads, in-app purchases and device support there is nothing between them.

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

CrowdMag ships an update every 2 months, TankPlanH2O every 2 weeks. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | CrowdMag | TankPlanH2O |
| --- | --- | --- |
| 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 | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 18 MB | 3 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [University of Colorado Boulder](https://appshunter.io/developer/972210292) | [Chaoticfox LLC](https://appshunter.io/developer/1554581984) |

## 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


### TankPlanH2O

[App page](https://appshunter.io/ios/app/tankplanh2o/id6503006578)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CrowdMag free?

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

### Is TankPlanH2O free?

TankPlanH2O is free to download, with no in-app purchases.

### Do CrowdMag or TankPlanH2O have ads?

Neither CrowdMag nor TankPlanH2O shows ads.

### Which is updated more often, CrowdMag or TankPlanH2O?

CrowdMag ships an update every 2 months, and TankPlanH2O every 2 weeks. Most recently, CrowdMag was updated on October 26, 2026 and TankPlanH2O on October 27, 2026.

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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.*