# CrowdMag vs Local Sidereal Time

The clearest difference is in-app purchases: CrowdMag at none against Local Sidereal Time's 1. CrowdMag also leads on update cadence (every 2 months vs every 4 months). Local Sidereal Time's advantage is rating (4.7 vs 4.3) and ratings volume (1.1K vs 25). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Local Sidereal Time sells 1 one-off in-app purchase. CrowdMag asks for nothing beyond the download.

Local Sidereal Time holds the better App Store score, 4.7 against 4.3. That said, the two scores are not equally well evidenced: Local Sidereal Time has 1.1K 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 71% of Local Sidereal Time's.

CrowdMag ships an update every 2 months, Local Sidereal Time every 4 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | CrowdMag | Local Sidereal Time |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (25 ratings)](https://appshunter.io/ios/app/crowdmag/id910578825/reviews) | **[4.7 (1.1K ratings)](https://appshunter.io/ios/app/local-sidereal-time/id1256725300/reviews)** |
| Number of ratings | 25 | **1.1K** |
| Positive reviews | 52.9% of reviews | **70.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 18 MB | 20 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [University of Colorado Boulder](https://appshunter.io/developer/972210292) | [Scott Spiller](https://appshunter.io/developer/1256725299) |

## 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


### Local Sidereal Time

[App page](https://appshunter.io/ios/app/local-sidereal-time/id1256725300)

This app calculates local sidereal time, a system astronomers use to locate celestial objects. It can also be used for personal development, with studies suggesting increased psychic abilities during specific sidereal times. The pro version offers advanced features like notifications and map-based calculations.

**Highlights:** Calculate local sidereal time, Astronomy celestial object location, Potential psychic ability enhancement, Pro version notifications, Pro version map-based calculation, Pro version date/time conversion

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $4.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Useful app
- 💡 Helpful notifications
- 👍 Great customer service
- 💡 Excellent tool

**What reviewers complain about**

- 🐛 Alarm doesn't work
- 🐛 Crashes frequently
- 🔒 Pro purchase issues
- 🐛 Notification issues

**Reported bugs**

- Alarm doesn't work
- Crashes when loading
- Notification issues
- Pro purchase restoration not working

**Requested features**

- Add alarm feature
- Allow setting location manually
- Improve notification handling
- Automatically adjust for daylight saving time


## Frequently asked questions

### Is CrowdMag free?

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

### Is Local Sidereal Time free?

Local Sidereal Time is free to download, with in-app purchases available.

### Which has better reviews, CrowdMag or Local Sidereal Time?

Local Sidereal Time is rated higher. CrowdMag averages 4.3 out of 5 from 25 ratings, while Local Sidereal Time averages 4.7 from 1.1K ratings.

### Do CrowdMag or Local Sidereal Time have ads?

Neither CrowdMag nor Local Sidereal Time shows ads.

### Which is updated more often, CrowdMag or Local Sidereal Time?

CrowdMag ships an update every 2 months, and Local Sidereal Time every 4 months. Most recently, CrowdMag was updated on October 24, 2026 and Local Sidereal Time on October 24, 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.*