# CrowdMag vs Polar Scope Align Pro

The clearest difference is price: CrowdMag at Free against Polar Scope Align Pro's $3.99. CrowdMag also leads on in-app purchases (none vs 3). Polar Scope Align Pro's advantage is review sentiment (97% vs 53%) and rating (4.9 vs 4.3). On update cadence, ads and device support there is nothing between them.

CrowdMag is free to download; Polar Scope Align Pro costs $3.99 up front. Polar Scope Align Pro sells 3 one-off in-app purchases. CrowdMag asks for nothing beyond the download.

Polar Scope Align Pro holds the better App Store score, 4.9 against 4.3. That said, the two scores are not equally well evidenced: Polar Scope Align Pro has 305 ratings behind it against 24, 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 97% of Polar Scope Align Pro's.

Both ship on a similar rhythm, roughly every 2 months. Both last shipped on September 22, 2026.

## The numbers

| Metric | CrowdMag | Polar Scope Align Pro |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [4.3 (24 ratings)](https://appshunter.io/ios/app/crowdmag/id910578825/reviews) | **[4.9 (305 ratings)](https://appshunter.io/ios/app/polar-scope-align-pro/id970161373/reviews)** |
| Number of ratings | 24 | **305** |
| Positive reviews | 52.9% of reviews | **97.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | — | **#81** |
| Size | 18 MB | 32 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [University of Colorado Boulder](https://appshunter.io/developer/972210292) | [Dimitrios Kechagias](https://appshunter.io/developer/970157964) |

## 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


### Polar Scope Align Pro

[App page](https://appshunter.io/ios/app/polar-scope-align-pro/id970161373)

**Currently charting:** #81 Top Paid · Utilities (US App Store)

This app assists astronomers with precise polar alignment for telescopes, offering tools for various reticles and low-latitude accuracy. It also includes a comprehensive suite of astro tools, from object databases to calculators and weather reports.

**Highlights:** Accurate polar alignment calculation, Support for numerous polar scope reticles, Daytime/no polarscope alignment tool, Deep Space Object database, Astrophotography calculators, World astro-weather report

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tip 1x | $0.99 | one-time |
| Tip 4x | $3.99 | one-time |
| Tip 10x | $9.99 | one-time |

**What reviewers like**

- 🚀 Best Polar Alignment App
- 👍 Detailed Instructions and Explanations
- 👍 Fantastic App with Many Useful Features
- 👍 Intuitive and No Distractions
- 👍 Comprehensive Astronomy App

**What reviewers complain about**

- 🐛 Compass Inaccurate
- 🐛 Location Data Inaccurate

**Reported bugs**

- Weather Updates Not Working
- Compass Deflected by Mount

**Requested features**

- Add Observation Recording Feature
- Add Push To Option for DSO Objects


## Frequently asked questions

### Is CrowdMag free?

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

### Is Polar Scope Align Pro free?

Polar Scope Align Pro costs $3.99, and also offers in-app purchases.

### Which has better reviews, CrowdMag or Polar Scope Align Pro?

Polar Scope Align Pro is rated higher. CrowdMag averages 4.3 out of 5 from 24 ratings, while Polar Scope Align Pro averages 4.9 from 305 ratings.

### Do CrowdMag or Polar Scope Align Pro have ads?

Neither CrowdMag nor Polar Scope Align Pro shows ads.

### Which is updated more often, CrowdMag or Polar Scope Align Pro?

CrowdMag ships an update every 2 months, and Polar Scope Align Pro every 2 months. Most recently, CrowdMag was updated on September 22, 2026 and Polar Scope Align Pro on September 22, 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.*