SP Music Box vs Necrometer II
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SP Music Box
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.
- EMF fluctuation detection
- Motion and rotation sensing
- Magnetic heading changes
- Customizable alert sounds
- Sensor activation logging
- Real-time sensor status display
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Dive into the mysteries of the paranormal with the SP Music Box app, designed specifically for paranormal investigations. Whether you're a seasoned ghost hunter or a curious novice, SP Music Box transforms your smartphone into a powerful tool for detecting the unseen. Through the use of nothing but your iPhone's built-in sensors, the app will detect and alert you to EMF fluctuations, motion and rotation of your device, and changes to the magnetic heading, so alerting you to the possible presence of a spirit. Whenever one of the sensors is activated, a sound will play (select from 5 different built-in sounds / tunes), and the screen will light up, showing which of the sensors has been triggered. Triggering a sensor will also create a log, so you can see later the exact time specific a specific sensor was activated. Download the SP Music Box app today and let it help you discover the unknown. Explore the mysteries that lie beyond our world and uncover the secrets of the paranormal with the ultimate investigator's music box app.
Necrometer II
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Necrometer II is a paranormal investigation companion designed for ghost hunters and researchers. The app combines motion and compass sensors with intelligent random word generation to assist during paranormal investigations. Features include sensor monitoring, spoken word generation, and an easy-to-use interface for use at haunted locations or during field investigations. PG-Necrometer is intended for entertainment purposes only and does not provide scientific or medical measurements.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | SP Music Box | Necrometer II |
|---|---|---|
| Price | $2.99 | $0.99 — better |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Best chart rank | #190 — better | — |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 8 MB |
| Age rating | 9+ | 9+ |
| Developer | Haunted Scotland Investigates LTD | michael smith |
In-app purchases
SP Music Box
No in-app purchases
Necrometer II
No in-app purchases
Questions
Is SP Music Box free?
Is Necrometer II free?
Do SP Music Box or Necrometer II have ads?
Which is updated more often, SP Music Box or Necrometer II?
Other comparisons
