Comparison

Unit Converter Calculator Pro vs Diffraction Grating Calculator

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

Head to head
About

Unit Converter Calculator Pro

Easily convert between metric and imperial units for a wide range of measurements including area, speed, temperature, and weight. Supports scientific prefixes and offers a history of your conversions. No internet connection required.

Highlights
  • Metric to Imperial unit conversion
  • Imperial to Metric unit conversion
  • Area, speed, temperature, volume, weight conversions
  • Scientific prefixes support
  • Conversion history
  • Offline functionality
Features
Read full description

With Unit Converter Calculator you will be able to convert all types of units from Metric to Imperial systems & Vice-versa in seconds. Finding the area, speed, distance, temperature, volume, time, weight, energy, power and more converted into different units. These are some of the conversions you can easily do with our * Simple Unit Converter Calculator * • Area: Yards, Acres, Hectares & Square: Meters, Miles, Inches & Feet. • Distance / Length: Meters, Miles, Inches, Feet, Yards, Nautical Miles. • Speed / Velocity: Kilometers / Miles per hour, Feet per second, Knots, Speed of sound, Speed of light. • Temperature: Celsius, Fahrenheit, Kelvin. • Time: Seconds, Minutes, Hours, Weeks, Months, Years. • Volume: Litters, Cubic Meters, Cubic Inches, Cubic Feet, Gallons, Quarts, Pints, Cups, Teaspoons, Tablespoons, Fluid ounces. • Weight / Mass: Grams, Kilograms, Milligrams, Pounds, Ounces, Tons, Stones. • Energy / Power / Torque: Watts, Joules, Calories, ElectronVolt, BTU, Therms, Foot-Pond. Plus an advanced view which makes available Scientific prefixes like Exa, Peta, Tera, Giga, Mega, Kilo, Deci, Centi, Milli, Micro, Nano, Pico, etc. Allowing you to make more scientific calculations. ** Main Features ** • The app is Multi-language, so you will get the correct unit name based on your language, either using the option or manually changing it. • Our library of available units to convert has the best selection, preventing the display of units that no one ever uses and displaying only the most used ones. • Make every calculation and combination between units possible, including scientific notation and time-based units. • History of your latest conversions so you can view them instantly without needing to recalculate every time. • No internet connection is needed to use this app. Download Now! Quick Unit Converter Calculator for FREE!

About

Diffraction Grating Calculator

Features
Read full description

Diffraction Grating Calculator is a physics/math calculator that calculates the angles of diffracted orders of monochromatic light when shone on a reflective diffraction grating. Features: - Instant calculation. - Results are copyable to other apps. - Formulas are included as reference. - Supports up to 16 decimal places. - Supports various units for each input. - Works seamlessly on both iPhone and iPad. - Lightweight, compact app optimized for everyday use. - Ad-free and built with privacy in mind. In optics, a diffraction grating is an optical component with a periodic structure that splits and diffracts light into several beams traveling in different directions. The emerging coloration is a form of structural coloration. The directions of these beams depend on the spacing of the grating and the wavelength of the light so that the grating acts as the dispersive element. Because of this, gratings are commonly used in monochromators and spectrometers. A diffraction grating is a material that contains a large number of parallel slits separated by a distance (d). This periodic separation of slits is usually on the order of micrometers. Because this distance is on the order of the wavelength of light, when light waves pass through the grating, the slits are able to cause constructive and destructive interference among the light waves. The waves will constructively interfere if the angle of reflection delays one of the waves by a whole wavelength. Diffraction grating equation: m * λ = a * sin(θm) Where: m: The order number of the diffracted image, m = 1,2,3 ... θ: Grating angle, in radians a: Grating Spacing, in lines per meter λ: Wavelength, in meters Thanks for your support and do visit nitrio.com for more apps for your iOS devices.

Screenshots

Unit Converter Calculator Pro4 screens
Diffraction Grating Calculator4 screens

Verdict

The call

The clearest difference is price: Unit Converter Calculator Pro at Free against Diffraction Grating Calculator's $2.99. Unit Converter Calculator Pro also leads on update cadence (monthly vs every 29 months). Diffraction Grating Calculator's advantage is in-app purchases (none vs 4) and ads (none vs shown). On device support and iOS requirement 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

Unit Converter Calculator Pro is free to download; Diffraction Grating Calculator costs $2.99 up front. Unit Converter Calculator Pro sells 4 one-off in-app purchases. Diffraction Grating Calculator asks for nothing beyond the download.

UpkeepUpdate frequency

Unit Converter Calculator Pro ships an update monthly, Diffraction Grating Calculator every 29 months. The most recent releases landed on October 13, 2026 and September 29, 2026 respectively.

Scorecard4 real differences · 6 level
Unit Converter Calculator Pro versus Diffraction Grating Calculator: the parameters behind the verdict, then further details
ParameterUnit Converter Calculator ProDiffraction Grating Calculator
PriceFree — better$2.99
Rating4.7 (977 ratings) — better—
Positive reviews76.2% of reviews—
Number of ratings977 — better—
Update frequencyMonthly — betterEvery 29 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, iPod
Requires iOS13.013
Further details — not scored
Size37 MB1 MB
Age rating4+4+
DeveloperRome Rock LLCNitrio

Bugs and requests

Unit Converter Calculator Pro

Reported bugs

1 issue
  • 🐛 Changing to something else

Requested features

3 requests
  • 💡 Favorite conversations
  • 💡 Color-coded sections
  • 💡 Money conversion

Diffraction Grating Calculator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

4 purchases

Unit Converter Calculator Pro

One-time4
  • Remove Ads & Unlock Themes$2.99
  • Remove Ads & Unlock Themes 1$4.99
  • Remove Ads & Unlock Themes 2$6.99
Show 1 more
  • Remove Ads & Unlock Themes 3$9.99
None

Diffraction Grating Calculator

No in-app purchases

Questions

Is Unit Converter Calculator Pro free?
Unit Converter Calculator Pro is free to download, with in-app purchases available.
Is Diffraction Grating Calculator free?
Diffraction Grating Calculator costs $2.99, with no in-app purchases.
Do Unit Converter Calculator Pro or Diffraction Grating Calculator have ads?
Unit Converter Calculator Pro shows ads; Diffraction Grating Calculator does not.
Which is updated more often, Unit Converter Calculator Pro or Diffraction Grating Calculator?
Unit Converter Calculator Pro ships an update monthly, and Diffraction Grating Calculator every 29 months. Most recently, Unit Converter Calculator Pro was updated on October 13, 2026 and Diffraction Grating Calculator on September 29, 2026.

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