# SP Music Box vs Necrometer II

The clearest difference is update cadence: Necrometer II at every 2 weeks against SP Music Box's every 5 months. Necrometer II also leads on price ($0.99 vs $2.99) and device support (3 vs 1). SP Music Box's advantage is chart position (#190 vs unranked). On ads and in-app purchases there is nothing between them.

SP Music Box costs $2.99 and Necrometer II $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SP Music Box ships an update every 5 months, Necrometer II every 2 weeks. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | SP Music Box | Necrometer II |
| --- | --- | --- |
| Price | $2.99 | **$0.99** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sp-music-box/id6504913402/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | Paid | — |
| Best chart rank | **#190** | — |
| Size | 9 MB | 8 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 9+ | 9+ |
| Developer | [Haunted Scotland Investigates LTD](https://appshunter.io/developer/1735305312) | [michael smith](https://appshunter.io/developer/6784636236) |

## What reviewers say

### SP Music Box

[App page](https://appshunter.io/ios/app/sp-music-box/id6504913402)

**Currently charting:** #190 Top Paid · Entertainment (US App Store)

This app uses your phone's sensors to detect paranormal activity by alerting you to EMF fluctuations, motion, and magnetic heading changes. It plays sounds and lights up the screen when sensors are triggered, logging events for later review.

**Highlights:** EMF fluctuation detection, Motion and rotation sensing, Magnetic heading changes, Customizable alert sounds, Sensor activation logging, Real-time sensor status display

**In-app purchases:** none


### Necrometer II

[App page](https://appshunter.io/ios/app/necrometer-ii/id6784636234)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SP Music Box free?

SP Music Box costs $2.99, with no in-app purchases.

### Is Necrometer II free?

Necrometer II costs $0.99, with no in-app purchases.

### Do SP Music Box or Necrometer II have ads?

Neither SP Music Box nor Necrometer II shows ads.

### Which is updated more often, SP Music Box or Necrometer II?

SP Music Box ships an update every 5 months, and Necrometer II every 2 weeks. Most recently, SP Music Box was updated on October 30, 2026 and Necrometer II on October 31, 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.*