# Mercury vs Simple Unit Convert Pro

The clearest difference is rating: Simple Unit Convert Pro at 5.0 against Mercury's 3.5. Simple Unit Convert Pro also leads on in-app purchases (none vs 5) and update cadence (every 2 months vs every 70 months). On price, ratings volume, ads and monetization model there is nothing between them.

Both are free to download. Mercury sells 5 one-off in-app purchases. Simple Unit Convert Pro asks for nothing beyond the download.

Simple Unit Convert Pro holds the better App Store score, 5.0 against 3.5. Both are backed by a comparable volume of ratings — 4 and 4 respectively.

Mercury ships an update every 70 months, Simple Unit Convert Pro every 2 months. Both last shipped on September 9, 2026.

## The numbers

| Metric | Mercury | Simple Unit Convert Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (4 ratings)](https://appshunter.io/ios/app/mercury-temperature-converter/id1494415587/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/simple-unit-convert-pro/id6477877519/reviews)** |
| Number of ratings | 4 | 4 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 70 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 4 MB | 27 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Samuel Herrera](https://appshunter.io/developer/962670797) | [Annika Gadman](https://appshunter.io/developer/1728509902) |

## What reviewers say

### 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 |


### Simple Unit Convert Pro

[App page](https://appshunter.io/ios/app/simple-unit-convert-pro/id6477877519)

This utility app offers a comprehensive solution for converting various units of measurement. It simplifies daily tasks by providing precise conversions for temperature, speed, distance, weight, volume, and area. Streamline your needs with this user-friendly converter.

**Highlights:** Temperature conversion (Fahrenheit/Celsius), Speed conversion (mph/kph), Distance conversion (miles/kilometers), Weight conversion (lbs/oz/kg), Volume conversion (cups/ml/gallons), Area conversion (sq ft/sq m)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mercury free?

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

### Is Simple Unit Convert Pro free?

Simple Unit Convert Pro is free to download, with no in-app purchases.

### Which has better reviews, Mercury or Simple Unit Convert Pro?

Simple Unit Convert Pro is rated higher. Mercury averages 3.5 out of 5 from 4 ratings, while Simple Unit Convert Pro averages 5.0 from 4 ratings.

### Do Mercury or Simple Unit Convert Pro have ads?

Neither Mercury nor Simple Unit Convert Pro shows ads.

### Which is updated more often, Mercury or Simple Unit Convert Pro?

Mercury ships an update every 70 months, and Simple Unit Convert Pro every 2 months. Most recently, Mercury was updated on September 9, 2026 and Simple Unit Convert Pro on September 9, 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.*