Comparison

Ghost Science M3 vs FOUR

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Ghost Science M3

This advanced paranormal investigation toolkit utilizes cutting-edge technology to detect and visualize potential supernatural activity. Features include infrared laser grid imaging, AI-driven figure detection, real-time audio analysis for spirit communication, and environmental monitoring.

Highlights
  • Infrared laser grid imaging with AI figure detection
  • Spirit Box with real-time audio analysis
  • LiDAR-enabled spatial mapping
  • Environmental monitoring for paranormal phenomena
  • EMF detection and visualization
  • EVP and ITC communication tools
Features
Read full description

Open the door to the paranormal with GHOST SCIENCE M3™, the pinnacle of ghost hunting technology. Trusted by the world’s leading professional investigators, GHOST SCIENCE M3™ is the culmination of over a decade of research and innovation. GHOST SCIENCE M3™ stands as the most advanced, comprehensive, and powerful paranormal investigation toolkit ever created. Nothing Compares. Vision The Vision instrument employs structured-light lidar-enabled infrared laser grid imaging, AI-driven computer vision, GPU-based image filtering, and advanced hardware management to deliver unparalleled night-vision, image processing, and real-time human-like figure detection. *Lidar is available only on Pro devices. Spirit Box The Spirit Box instrument leverages live streaming radio stations, advanced signal processing, real-time audio analysis, and dynamic frequency scanning to generate a blend of white noise and brief audio fragments. It is hypothesized that spiritual entities can manipulate these audio fragments using their energy, resulting in intelligible communications. Spatial Matrix The Spatial Matrix instrument uses LiDAR depth mapping, real-time mesh reconstruction, and GPU-accelerated analysis to visualize the geometric structure of the surrounding environment. It is theorized that paranormal energies may subtly distort these patterns, allowing investigators to observe potential manifestations within three-dimensional space. *Pro devices only. Music Box The Music Box instrument employs advanced sensor integration, real-time data analysis, and precise environmental monitoring to detect subtle changes in the ambient environment. In the realm of paranormal research, this instrument is utilized to identify the potential presence of paranormal phenomena. PEVP-VOX The Spirit Vox instrument generates a continuous sound bed composed of phonetic fragments, tonal shifts, and raw audio textures through advanced sound synthesis and real-time modulation. It is hypothesized that subtle environmental influences can manipulate these fragments, shaping them into speech-like bursts that may convey meaningful communication. EVP-ITC The EVP-ITC instrument employs full sensor integration to detect subtle environmental fluctuations and presents words based on an advanced, proprietary phonetically-based computational algorithm. Instrumental Trans-Communication (ITC) devices operate on the theory that paranormal entities can communicate by influencing the ITC device’s sensors. EMF The EMF instrument allows for precise detection, measurement, and visualization of ambient electromagnetic field levels across the electromagnetic spectrum in real-time. It is hypothesized that paranormal entities can influence and generate electromagnetic fields, which are detectable by the EMF instrument. Audio-EVP The Audio instrument analyzes intricate and nuanced audio signals to provide insights into the underlying acoustic properties of the environment. It is theorized that spirits or supernatural entities can manipulate acoustic wave data to produce electronic voice phenomena (EVP) not audible during the initial recording session. Frequency-EVP The Frequency instrument analyzes complex frequency signal harmonics to identify subtle variations and anomalies within the underlying acoustic environment. It is suggested that high audio frequencies, near and beyond the limit of human hearing, could be linked to paranormal phenomena. Geoscope The Geoscope instrument leverages gyroscope and accelerometer sensors to detect even the minutest device movements or vibrations. This functionality is predicated on the hypothesis that paranormal entities can induce subtle vibrations, such as footsteps or knocking sounds. Barometer The Barometer instrument employs the device’s advanced barometric sensor to detect extremely subtle variations in ambient pressure. This functionality is based on the hypothesis that paranormal phenomena may induce sudden or unexplained changes in pressure.

About

FOUR

This app uses AI to help you find four-leaf clovers. It offers a 4K shot mode for wide areas and a real-time mode for closer views. Upgrade to Pro for unlimited access to all features.

Highlights
  • AI-powered clover detection
  • 4K shot mode for wide areas
  • Real-time detection mode
  • Pro mode for unlimited access
  • Supports iPhone 12 or later
Features
Read full description

[iPhone12 or later recommended] Real four-leaf clover finder app with cutting edge AI. 4K shot mode can find 4-leaf clovers across wide area (~1500 clovers!) in one shot. The real-time mode can detect more reliably with a closer view, it is ideal for small clover patches. By upgrading to Pro mode, you can unlock all functions and gain unlimited access to the 4K shooting mode. [Notice] iPhone12 or later is recommended for smooth user experiences. iPhone 8 has been confirmed to work, but the processing speed will be slower.

Screenshots

Ghost Science M34 screens
FOUR3 screens

Verdict

The call

The clearest difference is price: FOUR at Free against Ghost Science M3's $10.99. FOUR also leads on iOS requirement (15.5 vs 18.0). Ghost Science M3's advantage is rating (4.6 vs 3.9) and in-app purchases (none vs 1). On update cadence, ads and device support 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

CostPrice · In-app purchases · Ads · Monetization

FOUR is free to download; Ghost Science M3 costs $10.99 up front. FOUR sells 1 one-off in-app purchase. Ghost Science M3 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Ghost Science M3 holds the better App Store score, 4.6 against 3.9. That said, the two scores are not equally well evidenced: Ghost Science M3 has 2.7K ratings behind it against 54, so its average is the more settled of the two. Written reviews point the same way: 74% of Ghost Science M3's written reviews are positive against 53% of FOUR's.

UpkeepUpdate frequency

Ghost Science M3 ships an update every 5 weeks, FOUR monthly. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

Scorecard8 real differences · 3 level
Ghost Science M3 versus FOUR: the parameters behind the verdict, then further details
ParameterGhost Science M3FOUR
Price$10.99Free — better
Rating4.6 (2.7K ratings) — better3.9 (54 ratings)
Positive reviews74.4% of reviews — better53.3% of reviews
Number of ratings2.7K — better54
Update frequencyEvery 5 weeksMonthly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
Best chart rank#5 — better—
DevicesiPhoneiPhone, iPod — better
Requires iOS18.015.5 — better
Further details — not scored
Size331 MB72 MB
Age rating9+4+
DeveloperMichael WeberSatoshi Ikebukuro

Customer experience

Ghost Science M3

All ratings2,678 ratings
Positive90.7%
Neutral4.1%
Negative5.3%
Written reviews168 reviews
Positive74.4%
Neutral7.1%
Negative18.5%

FOUR

All ratings54 ratings
Positive72.2%
Neutral3.7%
Negative24.1%
Written reviews15 reviews
Positive53.3%
Neutral20.0%
Negative26.7%

Bugs and requests

Ghost Science M3

Reported bugs

4 issues
  • Lidar feature not working
  • EVP recordings not saving
  • Frequent app crashes
  • Compatibility issues with certain iOS versions

Requested features

4 requests
  • Add ability to record and playback EVP sessions
  • Improve ghost box functionality
  • Provide more detailed information on sensor data
  • Allow customization of the dashboard

FOUR

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Ghost Science M3

No in-app purchases

1 purchases

FOUR

One-time1
  • Upgrade to Pro mode$1.99

Questions

Is Ghost Science M3 free?
Ghost Science M3 costs $10.99, with no in-app purchases.
Is FOUR free?
FOUR is free to download, with in-app purchases available.
Which has better reviews, Ghost Science M3 or FOUR?
Ghost Science M3 is rated higher. Ghost Science M3 averages 4.6 out of 5 from 2.7K ratings, while FOUR averages 3.9 from 54 ratings.
Do Ghost Science M3 or FOUR have ads?
Neither Ghost Science M3 nor FOUR shows ads.
Which is updated more often, Ghost Science M3 or FOUR?
Ghost Science M3 ships an update every 5 weeks, and FOUR monthly. Most recently, Ghost Science M3 was updated on October 29, 2026 and FOUR on October 30, 2026.

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