Comparison

inchCALC vs Mercury

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

inchCALC

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
Read full description

ENTRY LEVEL [FOOT • INCH • FRACTION] CALCULATOR MACWORLD **** "inchCALC's ease of use coupled with its advanced features make this an uncommonly good addition to a crowded genre." 3/9/09 inchCALC is an entry level construction calculator for people who work with the FEET• INCH• FRACTION dimensions used common rulers and tape measures. These dimensions are shear drudgery when you have to manually add or subtract them --- let alone multiply or divide. If you are a builder, contractor, sub-contractor, architect, engineer, artist, designer, student, homemaker or DIYer, you know the importance of working with accurate dimensions. inchCALC™ tranforms your iPhone / iPod Touch into an easy to use FT• IN• FRACTION construction calculator that inputs and outputs dimensions exactly as they appear on a tape measure. With inchCALC you can inexpensively perform the functions of expensive dedicated calculators on your iPhone / iPod Touch. Click on our website below to see feature details. If you like what you see, the full version, inchCALC+, has many more features, including conversion to METRIC & built-in TRIANGLE SOLVING. Look up inchCALC+ in iTunes

About

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.

Highlights
  • Celsius, Fahrenheit, Kelvin conversion
  • Interactive temperature scrolling
  • Dynamic background color
  • Reset to zero function
  • Decimal temperature support
Features
Read full description

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

inchCALC4 screens
Mercury4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
inchCALC versus Mercury: the parameters behind the verdict, then further details
ParameterinchCALCMercury
Price$1.99Free — better
Rating3.9 (15 ratings)4.0 (6 ratings) — better
Positive reviews53.1% of reviews100.0% of reviews — better
Number of ratings15 — better6
Update frequencyEvery 2 months — betterEvery 70 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS8.0 — better26.0
Further details — not scored
Size19 MB4 MB
Age rating4+4+
DeveloperRiver StudioSamuel Herrera

Customer experience

inchCALC

All ratings15 ratings
Positive73.3%
Neutral0.0%
Negative26.7%
Written reviews81 reviews
Positive53.1%
Neutral6.2%
Negative40.7%

Mercury

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

inchCALC

No in-app purchases

5 purchases

Mercury

One-time5
  • Small Tip$0.99
  • Remove Ads$1.99
  • Medium Tip$2.99
Show 2 more
  • Large Tip$4.99
  • Massive Tip$9.99

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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