# Thermometer vs Smell Annotator

The clearest difference is rating: Thermometer at 4.4 against Smell Annotator's 1.0. Thermometer also leads on ratings volume (4.2K vs 1) and iOS requirement (13.0 vs 15.0). Smell Annotator's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Thermometer sells 1 one-off in-app purchase. Smell Annotator asks for nothing beyond the download.

Thermometer holds the better App Store score, 4.4 against 1.0. That said, the two scores are not equally well evidenced: Thermometer has 4.2K ratings behind it against 1, so its average is the more settled of the two.

Thermometer ships an update every 2 months, Smell Annotator monthly. The most recent releases landed on September 23, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Thermometer | Smell Annotator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (4.2K ratings)](https://appshunter.io/ios/app/thermometer/id357949214/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/smell-annotator/id1607528175/reviews) |
| Number of ratings | **4.2K** | 1 |
| Positive reviews | 30.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 48 MB | 53 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alexandre Morcos](https://appshunter.io/developer/1453181584) | [SmartNanotubes Technologies](https://appshunter.io/developer/1607528177) |

## What reviewers say

### Thermometer

[App page](https://appshunter.io/ios/app/thermometer/id357949214)

This app transforms your iPhone or iPod Touch into a thermometer, displaying the exact outside temperature based on your current location. It provides detailed local weather conditions and allows you to check temperatures for other cities.

**Highlights:** Real-time outdoor temperature display, Location-based temperature readings, Local weather condition reports, Temperature checks for other cities, Celsius and Fahrenheit support, Universal app for all devices

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Temperature Forecast | $1.99 | one-time |

**What reviewers like**

- 👍 Simple and easy to use
- 🚀 Quick temperature display
- 💡 Useful for checking outdoor temperature

**What reviewers complain about**

- 🐛 Inaccurate temperature readings
- 🔍 Doesn't measure room/indoor temperature
- 💤 Doesn't update temperature in real-time
- 🔋 High battery consumption
- 📢 Excessive ads even in paid version

**Reported bugs**

- App crashes frequently
- Doesn't detect location properly
- Reported temperatures are inconsistent

**Requested features**

- Option to display indoor temperature
- Real-time temperature updates
- Ability to set temperature alerts/alarms


### 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 Thermometer free?

Thermometer 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, Thermometer or Smell Annotator?

Thermometer is rated higher. Thermometer averages 4.4 out of 5 from 4.2K ratings, while Smell Annotator averages 1.0 from 1 ratings.

### Do Thermometer or Smell Annotator have ads?

Thermometer shows ads; Smell Annotator does not.

### Which is updated more often, Thermometer or Smell Annotator?

Thermometer ships an update every 2 months, and Smell Annotator monthly. Most recently, Thermometer was updated on September 23, 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.*