# inchCALC vs Mercury

inchCALC and Mercury both sit at 3.9 stars, but that hides the real split: 100% of Mercury's written reviews are positive against 53% of inchCALC's. Mercury also leads on price (Free vs $1.99). inchCALC's advantage is in-app purchases (none vs 5) and update cadence (every 2 months vs every 70 months). On rating, ratings volume, ads and device support there is nothing between them.

Mercury is free to download; inchCALC costs $1.99 up front. Mercury sells 5 one-off in-app purchases. inchCALC asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 3.9 for inchCALC against 4.0 for Mercury. Both are backed by a comparable volume of ratings — 15 and 6 respectively. Written reviews are what separate them: 53% of inchCALC's written reviews are positive against 100% of Mercury's.

inchCALC ships an update every 2 months, Mercury every 70 months. The most recent releases landed on October 31, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | inchCALC | Mercury |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [3.9 (15 ratings)](https://appshunter.io/ios/app/inchcalc/id293841496/reviews) | **[4.0 (6 ratings)](https://appshunter.io/ios/app/mercury-temperature-converter/id1494415587/reviews)** |
| Number of ratings | **15** | 6 |
| Positive reviews | 53.1% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 70 months |
| Monetization | Paid | **Free** |
| Size | 19 MB | 4 MB |
| Requires iOS | **8.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [River Studio](https://appshunter.io/developer/293841499) | [Samuel Herrera](https://appshunter.io/developer/962670797) |

## What reviewers say

### inchCALC

[App page](https://appshunter.io/ios/app/inchcalc/id293841496)

This app serves as an entry-level construction calculator designed for users who frequently work with feet, inches, and fractions. It simplifies complex calculations involving these dimensions, transforming your device into a handy tool for builders, designers, and DIY enthusiasts.

**Highlights:** Calculates feet, inch, and fraction dimensions, Simplifies addition, subtraction, multiplication, and division, Inputs and outputs dimensions like a tape measure, Useful for builders, contractors, and DIYers, Transforms device into a construction calculator

**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 inchCALC free?

inchCALC costs $1.99, with no in-app purchases.

### Is Mercury free?

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

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

Mercury is rated higher. inchCALC averages 3.9 out of 5 from 15 ratings, while Mercury averages 4.0 from 6 ratings.

### Do inchCALC or Mercury have ads?

Neither inchCALC nor Mercury shows ads.

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

inchCALC ships an update every 2 months, and Mercury every 70 months. Most recently, inchCALC was updated on October 31, 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.*