# KJ Pole ID vs Magnetometer ∞

The clearest difference is in-app purchases: KJ Pole ID at none against Magnetometer ∞'s 2. KJ Pole ID also leads on ads (none vs shown) and iOS requirement (10.3 vs 17.0). Magnetometer ∞'s advantage is update cadence (every 2 weeks vs every 10 months). On price, rating, ratings volume 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. KJ Pole ID asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.5 for KJ Pole ID against 4.4 for Magnetometer ∞. Both are backed by a comparable volume of ratings — 26 and 59 respectively.

KJ Pole ID ships an update every 10 months, Magnetometer ∞ every 2 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | KJ Pole ID | Magnetometer ∞ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (26 ratings)](https://appshunter.io/ios/app/kj-pole-id/id1323248335/reviews)** | [4.4 (59 ratings)](https://appshunter.io/ios/app/magnetometer/id6753061844/reviews) |
| Number of ratings | 26 | **59** |
| Positive reviews | 88.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 10 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 20 MB | 16 MB |
| Requires iOS | **10.3** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [K&J Magnetics, Inc.](https://appshunter.io/developer/1323248334) | [Fawkes Wei](https://appshunter.io/developer/432767536) |

## What reviewers say

### KJ Pole ID

[App page](https://appshunter.io/ios/app/kj-pole-id/id1323248335)

Determine the north or south pole of a magnet facing your device. It also alerts you if a magnet is too close to your phone. An essential tool for anyone working with magnets.

**Highlights:** Identify north pole, Identify south pole, Detect magnet proximity, Magnet usage tool

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is KJ Pole ID free?

KJ Pole ID is free to download, with no in-app purchases.

### Is Magnetometer ∞ free?

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

### Which has better reviews, KJ Pole ID or Magnetometer ∞?

KJ Pole ID is rated higher. KJ Pole ID averages 4.5 out of 5 from 26 ratings, while Magnetometer ∞ averages 4.4 from 59 ratings.

### Do KJ Pole ID or Magnetometer ∞ have ads?

Magnetometer ∞ shows ads; KJ Pole ID does not.

### Which is updated more often, KJ Pole ID or Magnetometer ∞?

KJ Pole ID ships an update every 10 months, and Magnetometer ∞ every 2 weeks. Most recently, KJ Pole ID was updated on October 24, 2026 and Magnetometer ∞ 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.*