Fahrenheit Thermometer Plus vs Mercury
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fahrenheit Thermometer Plus
This free digital thermometer app uses GPS to measure and display the ambient temperature in Fahrenheit. It includes a Fahrenheit to Celsius conversion calculator and a barometer function for compatible devices. It also shows sunrise and sunset times, offering a reference for outdoor activities.
- GPS ambient temperature measurement
- Fahrenheit to Celsius conversion calculator
- Barometer function (iPhone 6/Plus and later)
- Badge displays Fahrenheit temperature
- Sunrise and sunset time display
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The simple free digital thermometer application that measures the ambient temperature of the current location measured by GPS and displays it in degrees Fahrenheit. The conversion calculator from Fahrenheit to Celsius with formula. Fahrenheit temperature is indicated in the badge (below zero is 1000, 1005 is -5 ℉). Barometric function by pressure sensor (iPhone 6 / Plus or later). Because it is outdoor temperature rather than indoor temperature, it is a reference for outfit clothes. Some areas are excluded. Displays sunrise time and sunset time.
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 Fahrenheit Thermometer Plus's 33%. Mercury also leads on ads (none vs shown). Fahrenheit Thermometer Plus's advantage is in-app purchases (none vs 5) and update cadence (every 10 months vs every 70 months). On price 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. Mercury sells 5 one-off in-app purchases. Fahrenheit Thermometer Plus asks for nothing beyond the download.
Fahrenheit Thermometer Plus holds the better App Store score, 4.3 against 4.0. That said, the two scores are not equally well evidenced: Fahrenheit Thermometer Plus has 269 ratings behind it against 6, so its average is the more settled of the two. Written reviews complicate that: 33% of Fahrenheit Thermometer Plus'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.
Fahrenheit Thermometer Plus ships an update every 10 months, Mercury every 70 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.
| Parameter | Fahrenheit Thermometer Plus | Mercury |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (269 ratings) — better | 4.0 (6 ratings) |
| Positive reviews | 33.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 269 — better | 6 |
| Update frequency | Every 10 months — better | Every 70 months |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 12.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 11 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | SHIGETO TAKAGI | Samuel Herrera |
Customer experience
Fahrenheit Thermometer Plus
Mercury
In-app purchases
Fahrenheit Thermometer Plus
No in-app purchases
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 Fahrenheit Thermometer Plus free?
Is Mercury free?
Which has better reviews, Fahrenheit Thermometer Plus or Mercury?
Do Fahrenheit Thermometer Plus or Mercury have ads?
Which is updated more often, Fahrenheit Thermometer Plus or Mercury?
Other comparisons
