# Simple Temperature Converter vs Mercury

The clearest difference is review sentiment: Mercury at 100% against Simple Temperature Converter's 0%. Mercury also leads on price (Free vs $0.99). Simple Temperature Converter's advantage is rating (5.0 vs 4.0) and in-app purchases (none vs 5). On ratings volume, ads and device support there is nothing between them.

Mercury is free to download; Simple Temperature Converter costs $0.99 up front. Mercury sells 5 one-off in-app purchases. Simple Temperature Converter asks for nothing beyond the download.

Simple Temperature Converter holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 4 and 6 respectively. Written reviews complicate that: 0% of Simple Temperature Converter'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.

Simple Temperature Converter ships an update every 6 months, Mercury every 70 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Simple Temperature Converter | Mercury |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/simple-temperature-converter/id1386469646/reviews)** | [4.0 (6 ratings)](https://appshunter.io/ios/app/mercury-temperature-converter/id1494415587/reviews) |
| Number of ratings | 4 | **6** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 70 months |
| Monetization | Paid | **Free** |
| Size | 0 MB | 4 MB |
| Requires iOS | **14.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Bruce Anthony](https://appshunter.io/developer/1386469645) | [Samuel Herrera](https://appshunter.io/developer/962670797) |

## What reviewers say

### Simple Temperature Converter

[App page](https://appshunter.io/ios/app/simple-temperature-converter/id1386469646)

Easily convert temperatures between Celsius and Fahrenheit with a simple sliding interface. This app offers a quick and intuitive way to switch units without typing, with customizable temperature ranges. It's designed for users who frequently need to check temperatures in different scales.

**Highlights:** Sliding conversion interface, Celsius to Fahrenheit conversion, Fahrenheit to Celsius conversion, Customizable temperature range, Quick and simple to use

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

**In-app purchases:** none


### 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 Simple Temperature Converter free?

Simple Temperature Converter costs $0.99, with no in-app purchases.

### Is Mercury free?

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

### Which has better reviews, Simple Temperature Converter or Mercury?

Simple Temperature Converter is rated higher. Simple Temperature Converter averages 5.0 out of 5 from 4 ratings, while Mercury averages 4.0 from 6 ratings.

### Do Simple Temperature Converter or Mercury have ads?

Neither Simple Temperature Converter nor Mercury shows ads.

### Which is updated more often, Simple Temperature Converter or Mercury?

Simple Temperature Converter ships an update every 6 months, and Mercury every 70 months. Most recently, Simple Temperature Converter was updated on November 2, 2026 and Mercury on November 3, 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.*