Comparison

Kalc vs Unit Eater

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

Head to head
About

Kalc

This utility app offers a unit converter, calculator, and world clock. Its user-friendly interface is designed for quick access to everyday calculations and conversions.

Highlights
  • Unit converter
  • Calculator
  • World clock
  • Simple UI
  • Quick results
Features
Read full description

Unit Converter, Calculator, and World Clock. The simple & clean UI to get the results you need for everyday use as quickly as possible.

About

Unit Eater

This utility app functions as a powerful calculator that handles unit conversions and calculations. It supports a vast array of predefined units and allows users to define their own, making it ideal for scientific and academic tasks. Features include a calculation history, customizable results, and dark mode.

Highlights
  • Unit conversion and calculation
  • Custom unit definition
  • Extensive unit library
  • Calculation history
  • Customizable result format
  • Dark mode
Read full description

Unique calculator that not only converts units, but can also perform calculations with them. Perfect for school, university, work, or personal use! For math, physics, chemistry, biology, engineering, or any other natural sciences! - Standard calculator functions usable with or without units - Target unit freely definable - Define your own units if you need them - History of recent calculations - Quick transfer of parts or entire calculations from history - ANS function to dynamically use the last result - Customizable result format - Quick search - Quick access to important functions like square or cube - Undo and redo of last steps - Dark mode Boost your productivity, focus on the essentials, and leave conversion errors in the past! Supports many units, prefixes, and constants: * Prefixes: kilo, mega, giga, tera, centi, milli, micro, nano, … * Constants: mass of proton, neutron, electron, Avogadro's constant, electric field constant, gas constant, Planck's constant, … * Angles: radian, degree, degree-minute, degree-second, gradian, turn, steradian, … * Length: meter, mile, inch, foot, yard, nautical mile, chain, furlong, cable length, rod, … * Area: square meter, hectare, acre, are, square kilometer, square inch, square foot, square yard, … * Volume: liter, cubic meter, fluid ounce, gallon, gill, pint, quart, barrel, tablespoon, teaspoon, … * Mass: gram, ton, ounce, pound, carat, grain, … * Time: second, minute, hour, day, year, … * Speed: meter per second, kilometer per hour, miles per hour, knot, speed of light, … * Acceleration: gravitational acceleration, meter per second squared, … * Energy: joule, kilocalorie, erg, watt-hour, electronvolt, … * Power: watt, horsepower, … * Force: Newton, pond, kilopond, tf, ozf, lbf, … * Torque: Newton meter, ozfin, ozfft, lbf*in, … * Frequency: Hertz, revolutions per minute, … * Pressure: pascal, bar, atm, at, Torr, mmHg, osi, ose, psi, psf, … * Viscosity: Poise, Stokes, … * Density: gram per cubic centimeter, kg per cubic meter, … * Radiation: Becquerel, Curie, Rutherford, Roentgen, Gray, Sievert, rem, … * Light: candela, lumen, lux * Electricity: volt, ampere, ohm, coulomb, elementary charge, farad, siemens, … * Magnetism: Weber, Tesla, Henry, … Is your desired unit not listed? You can define any additional units! Privacy Policy: https://www.iubenda.com/privacy-policy/22446614 Terms and Conditions: https://www.iubenda.com/terms-and-conditions/22446614

Screenshots

Kalc4 screens
Unit Eater4 screens

Verdict

The call

The clearest difference is in-app purchases: Kalc at none against Unit Eater's 2. Unit Eater's advantage is device support (4 vs 2). On price, review sentiment, update cadence and ads 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

Both are free to download. Unit Eater sells 2 in-app purchases, starting at $0.99 per month. Kalc asks for nothing beyond the download.

UpkeepUpdate frequency

Kalc ships an update every 9 days, Unit Eater every 2 weeks. The most recent releases landed on October 23, 2026 and October 16, 2026 respectively.

Scorecard3 real differences · 7 level
Kalc versus Unit Eater: the parameters behind the verdict, then further details
ParameterKalcUnit Eater
PriceFreeFree
Rating4.7 (3 ratings) — better—
Positive reviews96.2% of reviews100.0% of reviews — better
Number of ratings3 — better—
Update frequencyEvery 9 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod, Mac — better
Requires iOS13.412.0 — better
Further details — not scored
Size24 MB65 MB
Age rating4+4+
DeveloperYUTA OKAJIMATom Leon Schmidt

Customer experience

Kalc

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews26 reviews
Positive96.2%
Neutral3.8%
Negative0.0%

Unit Eater

Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Kalc

No in-app purchases

2 purchases

Unit Eater

Subscriptions1
  • Premium - Monthly$0.991 Month
One-time1
  • Premium - Pay once$3.99

Questions

Is Kalc free?
Kalc is free to download, with no in-app purchases.
Is Unit Eater free?
Unit Eater is free to download, with in-app purchases available.
Do Kalc or Unit Eater have ads?
Neither Kalc nor Unit Eater shows ads.
Which is updated more often, Kalc or Unit Eater?
Kalc ships an update every 9 days, and Unit Eater every 2 weeks. Most recently, Kalc was updated on October 23, 2026 and Unit Eater on October 16, 2026.

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