# Smell Annotator vs Hidden & Spy Camera Detector

The clearest difference is rating: Hidden & Spy Camera Detector at 3.9 against Smell Annotator's 1.0. Hidden & Spy Camera Detector also leads on ratings volume (835 vs 1). Smell Annotator's advantage is in-app purchases (none vs 8) and ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Hidden & Spy Camera Detector sells 8 in-app purchases, starting at $2.99 per 7 days. Smell Annotator asks for nothing beyond the download.

Hidden & Spy Camera Detector holds the better App Store score, 3.9 against 1.0. That said, the two scores are not equally well evidenced: Hidden & Spy Camera Detector has 835 ratings behind it against 1, so its average is the more settled of the two.

Smell Annotator ships an update monthly, Hidden & Spy Camera Detector every 8 months. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Smell Annotator | Hidden & Spy Camera Detector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/smell-annotator/id1607528175/reviews) | **[3.9 (835 ratings)](https://appshunter.io/ios/app/hidden-and-spy-camera-detector/id6444044162/reviews)** |
| Number of ratings | 1 | **835** |
| Positive reviews | — | 30.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 8 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 53 MB | 141 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SmartNanotubes Technologies](https://appshunter.io/developer/1607528177) | [Apps Labs](https://appshunter.io/developer/1648354195) |

## 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


### Hidden & Spy Camera Detector

[App page](https://appshunter.io/ios/app/hidden-and-spy-camera-detector/id6444044162)

Protect your privacy by scanning your surroundings for hidden spy cameras. This app offers multiple detection methods, including Wi-Fi scanning and infrared detection, to help you identify suspicious devices in any location.

**Highlights:** Wi-Fi scanner for suspicious devices, Red dot detection via phone lens, Scans hotel rooms, bathrooms, and changing rooms, Protects user privacy, Easy-to-use interface

**Features:** macOS Compatibility, Vision Pro support, SharePlay

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Camera Detector | $2.99 | per 7 days |
| Camera Detector | $6.99 | per month |
| Hidden Camera Detector | $6.99 | per month |
| Spy Camera Detector | $6.99 | per 7 days |
| Hidden Camera | $19.99 | per year |
| Spy Camera | $39.99 | per year |
| Hidden Camera | $39.99 | per year |
| Camera Detect | $49.99 | one-time |

**What reviewers like**

- ⭐ Excepcional
- 🔍 Effective camera detection
- 👍 Simple and easy to use
- 🕵️‍♀️ Provides peace of mind when traveling

**What reviewers complain about**

- 🚫 Doesn't work as advertised
- 🔒 Hard to cancel subscription
- 💰 Unauthorized charges
- 🤖 Inaccurate AI/lens detection

**Reported bugs**

- App crashes or shuts down during use
- Doesn't detect known hidden cameras

**Requested features**

- Clearer instructions on how to use the app
- Ability to easily cancel subscription
- More reliable camera detection capabilities


## Frequently asked questions

### Is Smell Annotator free?

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

### Is Hidden & Spy Camera Detector free?

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

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

Hidden & Spy Camera Detector is rated higher. Smell Annotator averages 1.0 out of 5 from 1 ratings, while Hidden & Spy Camera Detector averages 3.9 from 835 ratings.

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

Hidden & Spy Camera Detector shows ads; Smell Annotator does not.

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

Smell Annotator ships an update monthly, and Hidden & Spy Camera Detector every 8 months. Most recently, Smell Annotator was updated on October 27, 2026 and Hidden & Spy Camera Detector on October 30, 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.*