Reads wavelength in multiple units (nm, THz, fs) for versatile analysis
Automatic warnings help improve accuracy in non-ideal conditions
40-language support broadens accessibility and ease of use
Measurement accuracy is device-dependent due to smartphone camera sensors, with limitations at very short (<465 nm) and very long (>610 nm) wavelengths
Lacks professional calibration features and lux/illuminance-specific tools commonly found in dedicated instruments
Limited independent validation available outside user-based ratings
About Dominant λ Light Spectrometer
Dominant λ Light Spectrometer is a tools app developed by Contechity AB.
Download Statistics
Dominant λ Light Spectrometer has been downloaded 70 thousand times. In the last 30 days, the app was downloaded 1.5 thousand times.
User Ratings
Dominant λ Light Spectrometer is rated 4.44 out of 5 stars. The rating is based on 630 ratings.
App Information
Dominant λ Light Spectrometer is FREE to download. The APK download size is 20.37 MB. The latest version available is 3.6.0. The last update was on May 11, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on Google Play August 2023.
Description
This app gives you the possibility to very easily measure the dominant wavelength of different light sources.
The app uses the advanced capabilities of your smartphone's camera sensor, combined with sophisticated algorithms, to as accurately as possible analyze the incoming light and determine its dominant wavelength. This technology opens up a world of possibilities, allowing you to delve into the intricate details of the light spectrum in our environment.
For light with only one wavelength, such as the light from a regular colored LED, the dominant wavelength corresponds to the wavelength of that light.
Measuring Light • Find a white or gray surface (a plain piece of white paper works well). • Point your camera at the surface, ensuring it is lit by only the light source you wish to measure. • The app will display the dominant wavelength of the light in nanometers (nm), the frequency of the light in terahertz (THz) and the period length of the light in femtoseconds (fs).
Automatic Warnings The app provides helpful warnings when the conditions are not ideal for accurate measurement, to help you get the best results.
What is 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. If the light only has one wavelength, such as the light from a regular colored light emitting diode, LED, the dominant wavelength will of course correspond to the wavelength of that light source.
How Accurate are the Measurements? To measure the dominant wavelength of light accurately is more complex than it might appear. On a smartphone or tablet it is complicated further by the fact that all devices are different from each other. See the measurements as god approximations. Make sure that you always use a white surface and that only the light that you want to measure hits that surface. Also, avoid any shadows or reflections from your hands or your device. If you do that, the measurements shall be fairly good estimations. And for relative measurements, i.e. comparing the dominant wavelength between different light sources, with the same smartphone or tablet, the measurements shall be good if the conditions above are met.
Please note that the smartphone cameras have limitations when it comes to distinguishing between different very short (UV, ultraviolet), or very long (IR, infrared) 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.
The app now supports 40 different languages.
Free for a Limited Time Enjoy full functionality for a few weeks. After that, choose a one-time fee or subscription.
Feedback I value your feedback. Email me at apps@contechity.com with any suggestions.
Recent changes: • Added the ability to share measurements • Added the ability to change the date and time format for saved measurements
Please rate the app here on Google Play - it helps others find the app and gives me incentive to develop it further. Thank You!
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Comments on Dominant λ Light Spectrometer for Android
★★★★★Dawn Ayers· Dec 10, 2025
As far as I can tell this app seems to work pretty well. I would like to be able to test infrared light.
★★★★★Cheri· Jan 11, 2026
Such a cool app! I downloaded it to test the wavelength validity of a cheap red light therapy device. Didn't read ahead enough to see that my phone camera would sell me short. It was accurate for the orange light wavelengths, but the rest were out of range.
★★★★☆Derrick· Feb 28, 2024
It has potential but what I really needed is a full spectrum analysis across the entire spectrum with a chart not simply the dominant wavelength because I want to see how much blue light is being produced rather than simply the dominant frequency. That would be similar to an audio spectrum app where you can view the entire audio spectrum in real time as you speak and see the spikes in various wavelengths
★☆☆☆☆Infraguy· Nov 18, 2025
You can use it for free for a day or two, and you will see that it measures 575 nm even when there is only 620 nm and 535 nm in the light source, no 575 nm. It measures very inaccurately and has nothing to do with reality, which is orange and sometimes says 660 nm. It says infrared for purple things. Then it asks you to pay for it, you can't do anything, and you have to pay to continue using it. It's a scam, good for gaming but very bad at measuring.
★★☆☆☆Stephanie Thompson· Jan 3, 2025
Appears useless. Says aim the camera at a white surface, not the light source. So have to try to bounce the light source you are measuring off something white. With my computer screens 'bounced' it flips between extreme pure red and extreme deep blue. Obviously wrong. All other locations around the house/garden read around 570. All the time it says "saturation is low, so the accuracy might be low too". So direct light is too bright; medium-bright is too low. Always a warning on screen.
Google Play Rankings for Dominant λ Light Spectrometer
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Technologies used by Dominant λ Light Spectrometer
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Permissions
Network communication
view network connections,
full network access,
Google Play billing service,
Google Play license check
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