# Smell Annotator vs #1 Hidden Camera Detector

The clearest difference is rating: #1 Hidden Camera Detector at 4.2 against Smell Annotator's 1.0. #1 Hidden Camera Detector also leads on ratings volume (3.8K vs 1). Smell Annotator's advantage is in-app purchases (none vs 4). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. #1 Hidden Camera Detector sells 4 in-app purchases, starting at $4.99 per 7 days. Smell Annotator asks for nothing beyond the download.

#1 Hidden Camera Detector holds the better App Store score, 4.2 against 1.0. That said, the two scores are not equally well evidenced: #1 Hidden Camera Detector has 3.8K ratings behind it against 1, so its average is the more settled of the two.

Smell Annotator ships an update monthly, #1 Hidden Camera Detector fortnightly. The most recent releases landed on September 14, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Smell Annotator | #1 Hidden Camera Detector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/smell-annotator/id1607528175/reviews) | **[4.2 (3.8K ratings)](https://appshunter.io/ios/app/1-hidden-camera-detector/id1665597557/reviews)** |
| Number of ratings | 1 | **3.8K** |
| Positive reviews | — | 60.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 53 MB | 20 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| 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


### #1 Hidden Camera Detector

[App page](https://appshunter.io/ios/app/1-hidden-camera-detector/id1665597557)

Detect hidden cameras and microphones using your device's magnetic field sensor. This app helps secure your privacy in various locations by identifying electromagnetic fields emitted by electronic devices.

**Highlights:** Detects hidden cameras, Finds hidden microphones, Uses magnetic field sensor, Radiation detector, IR camera finder, Scans metal objects

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hidden Camera Detector Access | $4.99 | per 7 days |
| Hidden Camera Detector Access | $6.99 | per 7 days |
| Spy Detector Monthly Access | $12.99 | per month |
| Spy Detector Yearly Access | $39.99 | per year |

**What reviewers like**

- 🚀 Easy to use
- 🔒 Effective at detecting hidden cameras
- 👍 User-friendly interface
- 🚀 Quick and accurate detection
- 🔒 Provides peace of mind for travelers

**What reviewers complain about**

- 🐛 Some false positives reported
- 🔋 Can drain battery quickly
- 💰 Subscription-based model with high weekly cost

**Reported bugs**

- Scan progress bar not moving
- Inability to complete scans
- Compatibility issues with older devices

**Requested features**

- More detailed explanations about detection technology
- Additional customization options
- Ability to locate and identify detected devices


## Frequently asked questions

### Is Smell Annotator free?

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

### Is #1 Hidden Camera Detector free?

#1 Hidden Camera Detector is free to download, with in-app purchases available.

### Which has better reviews, Smell Annotator or #1 Hidden Camera Detector?

#1 Hidden Camera Detector is rated higher. Smell Annotator averages 1.0 out of 5 from 1 ratings, while #1 Hidden Camera Detector averages 4.2 from 3.8K ratings.

### Do Smell Annotator or #1 Hidden Camera Detector have ads?

Neither Smell Annotator nor #1 Hidden Camera Detector shows ads.

### Which is updated more often, Smell Annotator or #1 Hidden Camera Detector?

Smell Annotator ships an update monthly, and #1 Hidden Camera Detector fortnightly. Most recently, Smell Annotator was updated on September 14, 2026 and #1 Hidden Camera Detector on September 24, 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.*