# Ghost Vision SLS vs Smell Annotator

The clearest difference is rating: Ghost Vision SLS at 4.5 against Smell Annotator's 1.0. Ghost Vision SLS also leads on ratings volume (343 vs 1). Smell Annotator's advantage is in-app purchases (none vs 2) and update cadence (monthly vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Ghost Vision SLS sells 2 in-app purchases, starting at $1.99 per month. Smell Annotator asks for nothing beyond the download.

Ghost Vision SLS holds the better App Store score, 4.5 against 1.0. That said, the two scores are not equally well evidenced: Ghost Vision SLS has 343 ratings behind it against 1, so its average is the more settled of the two.

Ghost Vision SLS ships an update every 4 months, Smell Annotator monthly. The most recent releases landed on September 22, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Ghost Vision SLS | Smell Annotator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (343 ratings)](https://appshunter.io/ios/app/ghost-vision-sls/id1595033309/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/smell-annotator/id1607528175/reviews) |
| Number of ratings | **343** | 1 |
| Positive reviews | 47.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 176 MB | 53 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 9+ | 4+ |
| Developer | [Michael Weber](https://appshunter.io/developer/349078052) | [SmartNanotubes Technologies](https://appshunter.io/developer/1607528177) |

## What reviewers say

### Ghost Vision SLS

[App page](https://appshunter.io/ios/app/ghost-vision-sls/id1595033309)

This app uses advanced AI and lidar-enabled infrared imaging to detect human figures and provide unparalleled night vision. It offers 3D visualization, real-time alerts, and the ability to record and share findings, enhancing paranormal investigations.

**Highlights:** AI-driven infrared imaging, Real-time human figure detection, 3D visualization and analysis, Night vision in total darkness, Record and share findings, Lidar-enabled functionality (iPhone Pro)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access Subscription | $1.99 | per month |
| Lifetime Full Access | $11.95 | one-time |

**What reviewers like**

- 💡 Innovative LiDAR feature
- 👍 Great value for money (paid version)
- 👻 Fun and exciting experience
- ✅ Accurate representation (for some users)
- 🌟 Better than other ghost apps

**What reviewers complain about**

- 💰 Expensive paywall for features
- 💸 App takes money but gives nothing
- 👎 Fake SLS camera accusations
- 🚫 No free trial for full features
- 📉 Battery drain reported

**Reported bugs**

- Recorded files corrupted (no video/audio)
- Bug with turning LiDAR on/off in landscape orientation
- App freezes and not functioning
- Paid features not unlocking after payment
- App does not open after payment

**Requested features**

- Allow trial for paid features
- Add 4K recording
- Offer different color options for LiDAR depth and joints
- Option to save visible color video and LiDAR depth separately
- Repair corrupted video feature


### Smell Annotator

[App page](https://appshunter.io/ios/app/smell-annotator/id1607528175)

This application enables machines to digitally sense and analyze smells using nanomaterial-based technology. It allows users to view, annotate, and recognize smell measurements in real-time, functioning as part of a developer kit.

**Highlights:** Smell recognition, Smell digitalization and annotation, Saving and loading measurements, Real-time measurement visualization, Offline data collection, Graph synchronization

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Ghost Vision SLS free?

Ghost Vision SLS is free to download, with in-app purchases available.

### Is Smell Annotator free?

Smell Annotator is free to download, with no in-app purchases.

### Which has better reviews, Ghost Vision SLS or Smell Annotator?

Ghost Vision SLS is rated higher. Ghost Vision SLS averages 4.5 out of 5 from 343 ratings, while Smell Annotator averages 1.0 from 1 ratings.

### Do Ghost Vision SLS or Smell Annotator have ads?

Neither Ghost Vision SLS nor Smell Annotator shows ads.

### Which is updated more often, Ghost Vision SLS or Smell Annotator?

Ghost Vision SLS ships an update every 4 months, and Smell Annotator monthly. Most recently, Ghost Vision SLS was updated on September 22, 2026 and Smell Annotator on September 14, 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.*