Ghost SLS vs FOUR
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ghost SLS
This app emulates an SLS camera to detect human figures using your device's camera. It includes filters to help distinguish real detections from false positives caused by lighting. Users can capture and share photos of their findings and connect with others in a community chat.
- SLS camera emulation
- Human figure detection
- Camera filters for false positives
- Photo capture and sharing
- Community group chat
Read full descriptionHide full description
For our Ghost Hunter friends this tool will allow you to use your Apple device to scan for human figures. Ghost SLS works as an SLS Emulator to so you can get results without buying an expensive camera. The camera filters allow you to determine if the figure detected could be due to the lighting conditions of the area so you can spot false positives. Because this is not a true SLS camera your results in low light may be less reliable. Because of this it is recommended that you turn on your camera's torch light if you are scanning in dark areas. You can also snap photos of what you catch to share with your friends or other investigators. Join our group chat to discuss ghostly things with other users. If things get a little spooky we recommend turning on some lights and taking a break from the app for a while. :)
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.
- AI-powered clover detection
- 4K shot mode for wide areas
- Real-time detection mode
- Pro mode for unlimited access
- Supports iPhone 12 or later
Read full descriptionHide 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
Verdict
The clearest difference is price: FOUR at Free against Ghost SLS's $0.99. FOUR also leads on ads (none vs shown) and review sentiment (53% vs 37%). Ghost SLS's advantage is rating (4.4 vs 3.9) and in-app purchases (none vs 1). On device support and iOS requirement 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
FOUR is free to download; Ghost SLS costs $0.99 up front. FOUR sells 1 one-off in-app purchase. Ghost SLS asks for nothing beyond the download.
Ghost SLS holds the better App Store score, 4.4 against 3.9. That said, the two scores are not equally well evidenced: Ghost SLS has 3.7K ratings behind it against 54, so its average is the more settled of the two. Written reviews complicate that: 37% of Ghost SLS's written reviews are positive against 53% of FOUR's, so the app with the better star average is not the one people write more warmly about.
Ghost SLS ships an update every 2 months, FOUR monthly. Both last shipped on November 3, 2026.
| Parameter | Ghost SLS | FOUR |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.4 (3.7K ratings) — better | 3.9 (54 ratings) |
| Positive reviews | 36.8% of reviews | 53.3% of reviews — better |
| Number of ratings | 3.7K — better | 54 |
| Update frequency | Every 2 months | Monthly — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported — better | Free with in-app purchases |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 16.0 | 15.5 — better |
| Further details — not scored | ||
| Size | 50 MB | 72 MB |
| Age rating | 17+ | 4+ |
| Developer | OurBigAdventure, LLC | Satoshi Ikebukuro |
Customer experience
Ghost SLS
FOUR
Bugs and requests
Ghost SLS
Reported bugs
3 issues- Camera always faces forward, can't reverse
- Laggy and slow performance
- Anomalies disappear when tilting the camera
Requested features
3 requests- Ability to save/retrieve photos
- Improved accuracy in ghost detection
- Option to disable ads in paid version
FOUR
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Ghost SLS
No in-app purchases
FOUR
- Upgrade to Pro mode$1.99
