# Thermometer vs Mercury

The clearest difference is review sentiment: Mercury at 100% against Thermometer's 30%. Mercury also leads on ads (none vs shown) and monetization model (free vs free with in-app purchases). Thermometer's advantage is update cadence (every 2 months vs every 70 months) and rating (4.4 vs 4.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Thermometer sells 1 one-off in-app purchase and Mercury sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Thermometer holds the better App Store score, 4.4 against 4.0. That said, the two scores are not equally well evidenced: Thermometer has 4.4K ratings behind it against 6, so its average is the more settled of the two. Written reviews complicate that: 30% of Thermometer's written reviews are positive against 100% of Mercury's, so the app with the better star average is not the one people write more warmly about.

Thermometer ships an update every 2 months, Mercury every 70 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Thermometer | Mercury |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (4.4K ratings)](https://appshunter.io/ios/app/thermometer/id357949214/reviews)** | [4.0 (6 ratings)](https://appshunter.io/ios/app/mercury-temperature-converter/id1494415587/reviews) |
| Number of ratings | **4.4K** | 6 |
| Positive reviews | 29.9% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 70 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 48 MB | 4 MB |
| Requires iOS | **13.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Alexandre Morcos](https://appshunter.io/developer/1453181584) | [Samuel Herrera](https://appshunter.io/developer/962670797) |

## 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


### Mercury

[App page](https://appshunter.io/ios/app/mercury-temperature-converter/id1494415587)

Easily convert temperatures between Celsius, Fahrenheit, and Kelvin with an elegant and intuitive interface. Features dynamic background color changes based on temperature and supports decimal conversions.

**Highlights:** Celsius, Fahrenheit, Kelvin conversion, Interactive temperature scrolling, Dynamic background color, Reset to zero function, Decimal temperature support

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $0.99 | one-time |
| Remove Ads | $1.99 | one-time |
| Medium Tip | $2.99 | one-time |
| Large Tip | $4.99 | one-time |
| Massive Tip | $9.99 | one-time |


## Frequently asked questions

### Is Thermometer free?

Thermometer is free to download, with in-app purchases available.

### Is Mercury free?

Mercury is free to download, with in-app purchases available.

### Which has better reviews, Thermometer or Mercury?

Thermometer is rated higher. Thermometer averages 4.4 out of 5 from 4.4K ratings, while Mercury averages 4.0 from 6 ratings.

### Do Thermometer or Mercury have ads?

Thermometer shows ads; Mercury does not.

### Which is updated more often, Thermometer or Mercury?

Thermometer ships an update every 2 months, and Mercury every 70 months. Most recently, Thermometer was updated on October 27, 2026 and Mercury on October 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.*