Thermometer vs Mercury
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Thermometer
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.
- 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
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Thermometer is the number 1 thermometer application on the AppStore. The most accurate thermometer application on the AppStore! Thermometer is the original and top selling application that turns your iPhone or iPod Touch into a thermometer. This application will tell you the exact outside temperature based on your current location (GPS or WiFi). An animation will show you the current outdoor temperature on an stylish red LED thermometer. ************************************************************ FEATURES : ************************************************************ ◉ Universal app. This application works on your iPad, iPhone or iPod Touch. One version for all devices! ◉ Local temperature based on your current position (GPS or WiFi). ◉ Local condition report, temperature, high & low, wind speed & direction, and humidity level. ◉ You can check the temperature for other cities. Choose the city you want to see weather for by scrolling through your saved cities. You can add or delete cities, and reorder your list. PLEASE, ENTER THE CITY AND THE COUNTRY. ◉ The temperature is displayed in Celsius or Fahrenheit. ◉ The most accurate thermometer application on the AppStore. ◉ The application is available in English, French, Spanish, Italian, German and Japanese. IMPORTANT : This application requires an active Internet connection to retrieve data. You also need to turn on "Location Services" option in the settings of your iPhone. If you like this application, please leave us a review on iTunes. Your support would greatly help. Thank you for taking the time to report any bugs or to request an enhancement to Thermometer application. Feedback is very important to us. We will do our best to answer queries. Email us at support@presselite.com
Mercury
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.
- Celsius, Fahrenheit, Kelvin conversion
- Interactive temperature scrolling
- Dynamic background color
- Reset to zero function
- Decimal temperature support
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Mercury is the best temperature converter for Celsius, Fahrenheit and Kelvin. Elegant and easy to use. • Convert Celsius, Fahrenheit and Kelvin. • Scroll with your finger to change the current temperature. • Watch as the background color changes while you go hotter or colder. • Reset to zero with a quick tap. • Support for decimal temperature conversion.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 26, 2026 and October 24, 2026 respectively.
| Parameter | Thermometer | Mercury |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (4.4K ratings) — better | 4.0 (6 ratings) |
| Positive reviews | 29.9% of reviews | 100.0% of reviews — better |
| Number of ratings | 4.4K — better | 6 |
| Update frequency | Every 2 months — better | Every 70 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 48 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Alexandre Morcos | Samuel Herrera |
Customer experience
Thermometer
Mercury
Bugs and requests
Thermometer
Reported bugs
3 issues- App crashes frequently
- Doesn't detect location properly
- Reported temperatures are inconsistent
Requested features
3 requests- Option to display indoor temperature
- Real-time temperature updates
- Ability to set temperature alerts/alarms
Mercury
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Thermometer
- Temperature Forecast$1.99
Mercury
- Small Tip$0.99
- Remove Ads$1.99
- Medium Tip$2.99
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- Large Tip$4.99
- Massive Tip$9.99
Questions
Is Thermometer free?
Is Mercury free?
Which has better reviews, Thermometer or Mercury?
Do Thermometer or Mercury have ads?
Which is updated more often, Thermometer or Mercury?
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