# Magnetometer ∞ vs Bellwether Canary

The clearest difference is in-app purchases: Bellwether Canary at none against Magnetometer ∞'s 2. Bellwether Canary also leads on ads (none vs shown) and update cadence (every 4 days vs every 2 weeks). Magnetometer ∞'s advantage is iOS requirement (17.0 vs 26.0). On price and device support there is nothing between them.

Both are free to download. Magnetometer ∞ sells 2 in-app purchases, starting at $1.99 per 7 days. Bellwether Canary asks for nothing beyond the download.

Magnetometer ∞ ships an update every 2 weeks, Bellwether Canary every 4 days. The most recent releases landed on October 11, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Magnetometer ∞ | Bellwether Canary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (58 ratings)](https://appshunter.io/ios/app/magnetometer/id6753061844/reviews)** | — |
| Number of ratings | **58** | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 5 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Chen-Yu Wei](https://appshunter.io/developer/432767536) | [Bellwether, LLC — Acoustic Analysis](https://appshunter.io/developer/1883139354) |

## What reviewers say

### Magnetometer ∞

[App page](https://appshunter.io/ios/app/magnetometer/id6753061844)

Visualize magnetic fields in real-time with precision charts and monitor X, Y, Z axis readings. Ideal for scientific research, education, and field work, this app offers professional-grade accuracy and an intuitive interface for easy data interpretation.

**Highlights:** Real-time magnetic field visualization, X, Y, Z axis readings in microteslas, Scientific research tool, Educational aid, Field work companion, Intuitive interface

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $1.99 | per 7 days |
| Lifetime | $9.99 | one-time |


### Bellwether Canary

[App page](https://appshunter.io/ios/app/bellwether-canary/id6760197939)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Magnetometer ∞ free?

Magnetometer ∞ is free to download, with in-app purchases available.

### Is Bellwether Canary free?

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

### Do Magnetometer ∞ or Bellwether Canary have ads?

Magnetometer ∞ shows ads; Bellwether Canary does not.

### Which is updated more often, Magnetometer ∞ or Bellwether Canary?

Magnetometer ∞ ships an update every 2 weeks, and Bellwether Canary every 4 days. Most recently, Magnetometer ∞ was updated on October 11, 2026 and Bellwether Canary on September 28, 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.*