# Smell Annotator vs Spy / Hidden Camera Detector

The clearest difference is rating: Spy / Hidden Camera Detector at 4.1 against Smell Annotator's 1.0. Spy / Hidden Camera Detector also leads on ratings volume (814 vs 1) and update cadence (every 2 weeks vs monthly). Smell Annotator's advantage is in-app purchases (none vs 4). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Spy / Hidden Camera Detector sells 4 in-app purchases, starting at $5.99 per 7 days. Smell Annotator asks for nothing beyond the download.

Spy / Hidden Camera Detector holds the better App Store score, 4.1 against 1.0. That said, the two scores are not equally well evidenced: Spy / Hidden Camera Detector has 814 ratings behind it against 1, so its average is the more settled of the two.

Smell Annotator ships an update monthly, Spy / Hidden Camera Detector every 2 weeks. The most recent releases landed on September 14, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Smell Annotator | Spy / Hidden Camera Detector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/smell-annotator/id1607528175/reviews) | **[4.1 (814 ratings)](https://appshunter.io/ios/app/spy-hidden-camera-detector/id6472172603/reviews)** |
| Number of ratings | 1 | **814** |
| Positive reviews | — | 60.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | **Free** | Subscription |
| Size | 53 MB | 18 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [SmartNanotubes Technologies](https://appshunter.io/developer/1607528177) | [Gibco LTD](https://appshunter.io/developer/1649363079) |

## What reviewers say

### 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


### Spy / Hidden Camera Detector

[App page](https://appshunter.io/ios/app/spy-hidden-camera-detector/id6472172603)

Easily scan your local network for suspicious devices to uncover hidden spy cameras. Protect your privacy in hotels, bathrooms, and conference rooms with this powerful tool. It identifies devices by their MAC addresses and compares them with cloud data to reveal their type and manufacturer.

**Highlights:** Network device scanning, Infrared camera red dot identification, Common creepshot device detection, Magnetic detection, Anti-creepshot measure guide

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hidden Camera Detector 1 week | $5.99 | per 7 days |
| Hidden Camera Detector 1 month | $9.99 | per month |
| Hidden Camera Detector 1 month | $17.99 | per month |
| Hidden Camera Detector 1 year | $39.99 | per year |

**What reviewers like**

- 🚀 Detects Everything
- 👍 Easy to Use
- 🚀 Amazing Technology
- 🔒 Best Privacy Tool
- 👍 Easy and Effective

**What reviewers complain about**

- 🐛 Don't find nothing it is garbage
- 🐛 Tampering
- 🐛 Horrible waste of money and time
- 💰 The payment???
- 🐛 Won't let you cancel

**Reported bugs**

- App not scanning
- Doesn't work at all
- Doesn't work
- Doesn't explain how to use

**Requested features**

- Full access to hidden camera


## Frequently asked questions

### Is Smell Annotator free?

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

### Is Spy / Hidden Camera Detector free?

Spy / Hidden Camera Detector is free to download, with in-app purchases available.

### Which has better reviews, Smell Annotator or Spy / Hidden Camera Detector?

Spy / Hidden Camera Detector is rated higher. Smell Annotator averages 1.0 out of 5 from 1 ratings, while Spy / Hidden Camera Detector averages 4.1 from 814 ratings.

### Do Smell Annotator or Spy / Hidden Camera Detector have ads?

Neither Smell Annotator nor Spy / Hidden Camera Detector shows ads.

### Which is updated more often, Smell Annotator or Spy / Hidden Camera Detector?

Smell Annotator ships an update monthly, and Spy / Hidden Camera Detector every 2 weeks. Most recently, Smell Annotator was updated on September 14, 2026 and Spy / Hidden Camera Detector on September 17, 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.*