Comparison

Simple Pendulum Calculator vs Light Spectrometer Wavelength

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

Head to head
About

Simple Pendulum Calculator

This physics calculator quickly computes pendulum period, frequency, maximum height, energy, and speed. It supports various units, offers instant calculations with copyable results, and includes formulas for reference. Designed for privacy and efficiency, it works seamlessly on iOS devices.

Highlights
  • Instant pendulum calculations
  • Copyable results
  • Included formulas
  • Supports various units
  • High precision (16 decimal places)
  • Ad-free and private
Features
Read full description

The Simple Pendulum Calculator is a physics/math calculator designed to find the pendulum period, frequency, maximum height, energy of the system, or speed at the bottom quickly and easily. 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. A pendulum is a weight suspended from a pivot so that it can swing freely. When a pendulum is displaced sideways from its resting equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position. When released, the restoring force acting on the pendulum's mass causes it to oscillate about the equilibrium position, swinging back and forth. The time for one complete cycle, a left swing and a right swing, is called the period. The period depends on the length of the pendulum and also to a slight degree on the amplitude, the width of the pendulum's swing. Simple Pendulum equation: T = 2π * √L/g Where: T : Period of the simple pendulum L : Length of the pendulum g : Acceleration due to gravity, the standard gravity of Earth is 9.80665m/s2 The velocity at the bottom of the swing is: v = √2g * L * (1-cos(a)) Where: v : The velocity at the bottom of the pendulum a : The angle from the vertical The Maximum height is: H = L - L * cos(a) The system energy is: E = m * v2 / 2 Where: E : System energy m : Mass of the object v : The velocity at the bottom of the pendulum Thanks for your support, and do visit nitrio.com for more apps for your iOS devices.

About

Light Spectrometer Wavelength

This application analyzes light to determine its dominant wavelength in nanometers, frequency in terahertz, and period length in femtoseconds. It provides real-time measurements and allows users to save their findings with notes. The app is designed for measuring colored light sources.

Highlights
  • Measures dominant wavelength (nm)
  • Measures frequency (THz)
  • Measures period length (fs)
  • Real-time measurement
  • Save measurements with notes
  • Optional calibration
Features
Read full description

Measures light spectrum to determine the dominant wavelength in nm, frequency in THz and period length in fs. DOMINANT WAVELENGTH Dominant wavelength is a concept commonly used in the field of color science and perception. It refers to the wavelength of light that appears most prominent or dominant in a given color mixture or light source. In other words, it is the wavelength that our eyes perceive as the primary color in a mixture of different wavelengths. For light with only one wavelength, such as the light from a colored LED, the dominant wavelength corresponds to the wavelength of that light. KEY FEATURES • High accuracy • Real-time measurement • Measures light wavelength in nanometers (nm) • Measures light frequency in terahertz (Thz) • Measures light period length in femtoseconds (fs) • Easy to use • Save measurements with notes • Supports 40 languages, including english • Optional calibration for enhanced precision MEASURING 1. Find a white surface, such as a plain piece of white paper 2. Point your camera at the surface illuminated by your target light source 3. The app gives you accurate measurements in real-time LIMITATIONS Smartphone cameras have limitations when it comes to distinguishing between different very short, or very long wavelengths. More specifically, on many devices the accuracy below 465 nm and above 610 nm is very limited. This is due to the physical camera sensors in the devices. An automatic warning appears on the screen for these short and long wavelengths. WHITE LIGHT Note that is not meaningful to measure the dominant wavelength of white light as white light consists of a wide range of wavelengths, with no wavelength dominating. This app is made for measuring colored light. If you are interested in determining the color temperature of white light, please instead use our popular White Balance Kelvin Meter app. COLOR OF SURFACES If you want to measure the color of a surface or material, rather than of light, please instead use our popular Colorimeter Camera Color Meter app. Privacy Policy, https://spectrometer.contechity.com/pp.html End User License Agreement, https://spectrometer.contechity.com/eula.html CONTACT I value your feedback. Email me at apps@contechity.com with any suggestions or questions. Download the Spectrometer now!

Screenshots

Simple Pendulum Calculator4 screens
Light Spectrometer Wavelength4 screens

Verdict

The call

The clearest difference is price: Light Spectrometer Wavelength at Free against Simple Pendulum Calculator's $2.99. Light Spectrometer Wavelength also leads on update cadence (every 2 months vs every 31 months) and ratings volume (94 vs 1). Simple Pendulum Calculator's advantage is rating (5.0 vs 4.2) and in-app purchases (none vs 7). On 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

Light Spectrometer Wavelength is free to download; Simple Pendulum Calculator costs $2.99 up front. Light Spectrometer Wavelength sells 4 in-app purchases, starting at $0.99 per month. Simple Pendulum Calculator asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Simple Pendulum Calculator holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Light Spectrometer Wavelength has 94 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Simple Pendulum Calculator ships an update every 31 months, Light Spectrometer Wavelength every 2 months. The most recent releases landed on September 29, 2026 and October 13, 2026 respectively.

Scorecard7 real differences · 3 level
Simple Pendulum Calculator versus Light Spectrometer Wavelength: the parameters behind the verdict, then further details
ParameterSimple Pendulum CalculatorLight Spectrometer Wavelength
Price$2.99Free — better
Rating5.0 (1 ratings) — better4.2 (94 ratings)
Positive reviews—72.7% of reviews
Number of ratings194 — better
Update frequencyEvery 31 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13 — better15.0
Further details — not scored
Size1 MB43 MB
Age rating4+4+
DeveloperNitrioContechity AB

Customer experience

Simple Pendulum Calculator

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Light Spectrometer Wavelength

All ratings94 ratings
Positive80.9%
Neutral3.2%
Negative16.0%
Written reviews33 reviews
Positive72.7%
Neutral3.0%
Negative24.2%

In-app purchases

None

Simple Pendulum Calculator

No in-app purchases

4 purchases

Light Spectrometer Wavelength

Subscriptions3
  • Full Access7 Days trial$0.991 Month
  • Full access14 Days trial$0.991 Month
  • Full access$4.991 Year
One-time1
  • Full access4 variants$6.99

Questions

Is Simple Pendulum Calculator free?
Simple Pendulum Calculator costs $2.99, with no in-app purchases.
Is Light Spectrometer Wavelength free?
Light Spectrometer Wavelength is free to download, with in-app purchases available.
Which has better reviews, Simple Pendulum Calculator or Light Spectrometer Wavelength?
Simple Pendulum Calculator is rated higher. Simple Pendulum Calculator averages 5.0 out of 5 from 1 ratings, while Light Spectrometer Wavelength averages 4.2 from 94 ratings.
Do Simple Pendulum Calculator or Light Spectrometer Wavelength have ads?
Neither Simple Pendulum Calculator nor Light Spectrometer Wavelength shows ads.
Which is updated more often, Simple Pendulum Calculator or Light Spectrometer Wavelength?
Simple Pendulum Calculator ships an update every 31 months, and Light Spectrometer Wavelength every 2 months. Most recently, Simple Pendulum Calculator was updated on September 29, 2026 and Light Spectrometer Wavelength on October 13, 2026.

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