Comparison

iRotorBalancer 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

iRotorBalancer

This technical tool assists in balancing rotating machinery using single or two-plane methods. It connects to external hardware to measure vibration amplitude and phase, then calculates necessary correction weights and their positions. Reports can be generated and emailed.

Highlights
  • Single-plane balancing (Vector & Four-Runs methods)
  • Two-plane balancing (Influence Coefficients)
  • Real-time waveform and FFT spectrum display
  • Automatic 1X peak amplitude and phase selection
  • Polar plot and weight location graphics
  • Report generation with plots, data, and images
Features
Read full description

iRotorBalancer is a technical tool for balancing of rotating machinery in single-plane and two-planes. The iPad application connects to an external hardware to collect the vibration Amplitude and Phase with an accelerometer and Optical Sensor, and calculates the correction balancing weights and its angular positions. NOTE: This app works with an external hardware (contact www.motionics.com for more information) FEATURES: - Single-Plane balancing using the Vector-Method (Amplitude & Phase Measurements) - Single-Plane balancing using the Four-Runs-Method (Amplitude Measurement) - Two-Planes Balancing using the Influence Coefficients Method (Amplitude & Phase Measurements) - Displays Real-Time Waveform signal - Displays Real-Time Spectrum of the Vibration Signal (FFT) - Automatic Select the 1X Peak amplitude and Phase - Polar Plot and Graphic location of the trial and correction weights - Handy calculator to estimate the Trial Weights - Angular mass distribution calculator - Permissible Residual Imbalance determination - Calculate weight removal (drilling) - Generate complete Report with Spectrum, Polar Plots, Balancing Data, Pictures from Camera or Library, Map location, Notes and Signature. - Email pdf report - Accelerometer Calibration Option - Complete help and instruction

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

Light Spectrometer Wavelength4 screens

Verdict

The call

The clearest difference is price: Light Spectrometer Wavelength at Free against iRotorBalancer's $799.99. Light Spectrometer Wavelength also leads on ratings volume (92 vs 1) and device support (3 vs 1). iRotorBalancer's advantage is rating (5.0 vs 4.2) and iOS requirement (11.0 vs 15.0). On update cadence, ads and in-app purchases 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; iRotorBalancer costs $799.99 up front. iRotorBalancer sells 2 one-off in-app purchases and Light Spectrometer Wavelength sells 4 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

iRotorBalancer 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 92 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on June 24, 2026 and September 22, 2026 respectively.

Scorecard6 real differences · 4 level
iRotorBalancer versus Light Spectrometer Wavelength: the parameters behind the verdict, then further details
ParameteriRotorBalancerLight Spectrometer Wavelength
Price$799.99Free — better
Rating5.0 (1 ratings) — better4.2 (92 ratings)
Positive reviews—71.9% of reviews
Number of ratings192 — better
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesYesYes
MonetizationPaidFree with in-app purchases — better
DevicesiPadiPhone, iPad, iPod — better
Requires iOS11.0 — better15.0
Further details — not scored
Size18 MB43 MB
Age rating17+4+
DeveloperMotionics, LLCContechity AB

Customer experience

iRotorBalancer

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

Light Spectrometer Wavelength

All ratings92 ratings
Positive80.4%
Neutral3.3%
Negative16.3%
Written reviews32 reviews
Positive71.9%
Neutral3.1%
Negative25.0%

In-app purchases

2 purchases

iRotorBalancer

One-time2
  • Custom Report Header and Logo$49.99
  • Two-Plane Overhung Rotor Balancing$249.99
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 iRotorBalancer free?
iRotorBalancer costs $799.99, and also offers in-app purchases.
Is Light Spectrometer Wavelength free?
Light Spectrometer Wavelength is free to download, with in-app purchases available.
Which has better reviews, iRotorBalancer or Light Spectrometer Wavelength?
iRotorBalancer is rated higher. iRotorBalancer averages 5.0 out of 5 from 1 ratings, while Light Spectrometer Wavelength averages 4.2 from 92 ratings.
Do iRotorBalancer or Light Spectrometer Wavelength have ads?
Neither iRotorBalancer nor Light Spectrometer Wavelength shows ads.
Which is updated more often, iRotorBalancer or Light Spectrometer Wavelength?
iRotorBalancer ships an update every 2 months, and Light Spectrometer Wavelength every 2 months. Most recently, iRotorBalancer was updated on June 24, 2026 and Light Spectrometer Wavelength on September 22, 2026.

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