Light Spectrometer Wavelength3.8.0 - App Store

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!

Version History • Saved measurements can now be folded per date, giving you a better overview when you have many measurements.
• Misc minor improvements.

This feature was suggested by a user. Got an idea too? Share it in a review! 3.8.0 Sep 1 • Clearer readings at the edges of the measurable spectrum: out-of-range light now shows a consistent wavelength range, frequency and period length live and in your saved measurements.
• Misc minor improvements

Missing a feature? Let me know in a review! 3.7.1 Jul 3 • 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 the App Store - it helps others find the app and gives me incentive to develop it further. Thank You! 3.6.0 May 19 • Misc minor improvements.

Please rate the app here on App Store - it helps others find the app and gives me incentive to develop it further. Thank You! 3.5.0 Mar 2 • Added the possibility to export saved measurements 3.4.1 12/17/2025 • Added the possibility to save measurements with comments
• Corrected erroneous period length calculation
• Improved text and images explaining the app 3.3.0 10/17/2025 • Misc minor improvements.
Please rate the app here on App Store - it helps others find the app and gives me incentive to develop it further. Thank You! 3.2.1 07/01/2025 • Added a frequently requested high contrast mode for improved readability.
• Better sorting of the 40 different languages that are now supported.
• Improved support for large screens. 3.2.0 04/01/2025 • Misc minor improvements

Questions or suggestions? Write to me at apps@contechity.com
If you like the app, please rate and review it here on the App Store - it helps others find the app and it gives me incentive to develop it further. Thanks! 3.1.0 02/14/2025 • Added support for 20+ different languages
• Misc minor improvements 3.0.0 10/25/2024 • Added explanations to automatic warnings - click on a warning to get more info about it.
• Improved information text

Please rate the app here on the App Store - it helps others find the app and gives me incentive to develop it further. Thank You! 2.3.0 06/24/2024 • Misc minor improvements.
Questions or suggestions? Write to me att apps@contechity.com
If you like the app, make sure you rate and review it here on App Store - it helps others find the app and it gives me incentive to develop it further. Thanks! 2.2.0 03/31/2024 • Added the possibility to share calibration values. 2.1.0 02/10/2024 Increased resolution in measurement and in calibration! 2.0.1 12/20/2023 Increased resolution in measurement and in calibration! 2.0.0 12/11/2023 As requested by users: Shows now not only the dominant wavelength, but also the frequency and the period length of the dominant wavelength of the light. 1.4.0 12/05/2023 Added the requested possibility to calibrate the app for improved accuracy! 1.3.1 10/30/2023 • Misc minor improvements
Do you have any suggestions? Contact me at apps@contechity.com
If you like the app, please rate and review it here on App Store - it helps others find the app and it gives me incentive to develop it further. Thanks! 1.2.0 10/20/2023 • Misc minor improvements
Do you have any suggestions? Contact me at apps@contechity.com
If you like the app, please rate and review it here on App Store - it helps others find the app and it gives me incentive to develop it further. Thanks! 1.1.0 10/06/2023 • Misc minor improvements
Do you have any suggestions? Contact me at apps@contechity.com
If you like the app, make sure you rate and review it here on App Store - it helps others find the app and it gives me incentive to develop it further. Thanks! 1.0.7 09/14/2023 1.0.4 07/14/2023