YOUFO vs Ghost SLS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
YOUFO
Connect with users globally to share experiences and sightings through an interactive map. Post anonymously and engage with weekly content to explore the ufology community.
- Global user connection
- Interactive sighting map
- Anonymous posting option
- Weekly blog, podcast, and video content
- Ufology community engagement
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YOUFO is the worlds first cross pollination smart phone app to connect users worldwide to each other. Uploader's are presented with a platform to share their experiences via use of the map by posting their sightings and abduction encounters. With a selection of 7 close encounters, there are no boundaries or social stigmas attached to the user as they can wish to remain anonymous in their postings. Users are encouraged to engage in weekly blog articles, podcasts, and videos to stimulate their interaction with YOUFO and the ufology community to its fullest experience.
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
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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. :)
Screenshots
Verdict
The clearest difference is price: YOUFO at Free against Ghost SLS's $0.99. YOUFO also leads on rating (5.0 vs 4.4) and ads (none vs shown). Ghost SLS's advantage is ratings volume (3.6K vs 5) and chart position (#38 vs unranked). On in-app purchases 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
YOUFO is free to download; Ghost SLS costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
YOUFO holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Ghost SLS has 3.6K ratings behind it against 5, so its average is the more settled of the two.
YOUFO ships an update every 2 weeks, Ghost SLS every 2 months. The most recent releases landed on October 12, 2026 and October 16, 2026 respectively.
| Parameter | YOUFO | Ghost SLS |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 5.0 (5 ratings) — better | 4.4 (3.6K ratings) |
| Positive reviews | — | 36.8% of reviews |
| Number of ratings | 5 | 3.6K — better |
| Update frequency | Every 2 weeks — better | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Best chart rank | — | #38 — better |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 10.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 315 MB | 50 MB |
| Age rating | 9+ | 17+ |
| Developer | A Dark Matter Creation LLC | OurBigAdventure, LLC |
Customer experience
YOUFO
Ghost SLS
Bugs and requests
YOUFO
Not enough reviews yet to summarise bugs or 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
In-app purchases
YOUFO
No in-app purchases
Ghost SLS
No in-app purchases
