Comparison

Light Spectrometer Wavelength vs Luminosys

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

Head to head
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!

About

Luminosys

Accurately measure ambient light levels in Lux or Foot Candles using your phone's camera. This tool is ideal for photography, comparing light sources, or indoor gardening. It's designed for ease of use and provides precise readings.

Highlights
  • Measures light in Lux
  • Measures light in Foot Candles (FC)
  • Uses phone camera for accuracy
  • Easy to use interface
  • Suitable for photography
  • Useful for indoor gardening
Read full description

Luminosys allows you to accurately measure the ambient light level in Lux or Foot Candles (FC). To do this, Luminosys uses your phone's camera in conjunction with a piece of paper to accurately measure the light level. It is very easy to use and is a great app for those looking for accurate light measurements for photography, comparing light sources, or indoor gardening.

Screenshots

Light Spectrometer Wavelength4 screens
Luminosys3 screens

Verdict

The call

The clearest difference is in-app purchases: Luminosys at none against Light Spectrometer Wavelength's 7. Light Spectrometer Wavelength's advantage is ads (none vs shown) and update cadence (every 2 months vs every 19 months). On price, rating, review sentiment 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

Both are free to download. Light Spectrometer Wavelength sells 4 in-app purchases, starting at $0.99 per month. Luminosys asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.2 for Light Spectrometer Wavelength against 4.3 for Luminosys. That said, the two scores are not equally well evidenced: Light Spectrometer Wavelength has 96 ratings behind it against 10, so its average is the more settled of the two. Written reviews are what separate them: 71% of Light Spectrometer Wavelength's written reviews are positive against 75% of Luminosys's.

UpkeepUpdate frequency

Light Spectrometer Wavelength ships an update every 2 months, Luminosys every 19 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

Scorecard6 real differences · 4 level
Light Spectrometer Wavelength versus Luminosys: the parameters behind the verdict, then further details
ParameterLight Spectrometer WavelengthLuminosys
PriceFreeFree
Rating4.2 (96 ratings)4.3 (10 ratings) — better
Positive reviews70.6% of reviews75.0% of reviews — better
Number of ratings96 — better10
Update frequencyEvery 2 months — betterEvery 19 months
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better16.0
Further details — not scored
Size43 MB3 MB
Age rating4+4+
DeveloperContechity ABMelissa Zwick

Customer experience

Light Spectrometer Wavelength

All ratings94 ratings
Positive80.9%
Neutral3.2%
Negative16.0%
Written reviews34 reviews
Positive70.6%
Neutral2.9%
Negative26.5%

Luminosys

All ratings7 ratings
Positive85.7%
Neutral0.0%
Negative14.3%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

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
None

Luminosys

No in-app purchases

Questions

Is Light Spectrometer Wavelength free?
Light Spectrometer Wavelength is free to download, with in-app purchases available.
Is Luminosys free?
Luminosys is free to download, with no in-app purchases.
Which has better reviews, Light Spectrometer Wavelength or Luminosys?
Luminosys is rated higher. Light Spectrometer Wavelength averages 4.2 out of 5 from 96 ratings, while Luminosys averages 4.3 from 10 ratings.
Do Light Spectrometer Wavelength or Luminosys have ads?
Luminosys shows ads; Light Spectrometer Wavelength does not.
Which is updated more often, Light Spectrometer Wavelength or Luminosys?
Light Spectrometer Wavelength ships an update every 2 months, and Luminosys every 19 months. Most recently, Light Spectrometer Wavelength was updated on November 3, 2026 and Luminosys on October 30, 2026.

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