# Light Spectrometer Wavelength — Spectrum Analyzer Spectroscope > Measures light spectrum for dominant wavelength, frequency, and period length. (iPhone/iPad app by Contechity AB.) - Source: https://appshunter.io/ios/app/light-spectrometer-wavelength/id6450930820 (this page in markdown: same URL + `.md`) - Developer: [Contechity AB](https://appshunter.io/developer/1649290454) - Category: Utilities, Health & Fitness - Price: Free with in-app purchases - Rating: 4.20/5 from 90 App Store ratings · 31 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 38 MB - Languages: American English, Afrikaans, Bulgarian, Catalan, Croatian, Czech, Danish, Dutch, Estonian, Filipino and 30 more - Released: 2023-07-14 - Data updated: 2026-08-26 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/light-spectrometer-wavelength/id6450930820/reviews.md ## What is Light Spectrometer Wavelength? 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! ## Key features - Measures dominant wavelength (nm) - Measures frequency (THz) - Measures period length (fs) - Real-time measurement - Save measurements with notes - Optional calibration ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Full access | $0.99 | per month | | Full access | $4.99 | per year | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Full access | $6.99 | one-time | | Full access | $6.99 | one-time | | Full access | $6.99 | one-time | | Full access | $6.99 | one-time | ## Recent user reviews (10 of 31) All indexed reviews: https://appshunter.io/ios/app/light-spectrometer-wavelength/id6450930820/reviews.md ### 1/5 — Warning - automatic payment *2026-06-06, version 3.6.0* App automatically debits your App Store account after a few weeks without even requesting your permission. Even if you’re not using the free version of the app!!! ### 5/5 — Thank you! *2026-05-30* This is a great tool … it’s spot on … I use it to see if the product actually is what they say it is with regards to light therapy. Love it!! **Developer response:** Thank you so much for the kind words! Really glad the app is proving useful for verifying light therapy products and that the app is spot on! Reviews like yours mean a lot to me as a solo developer. Happy measuring! ☀️ ### 1/5 — Abzocke, Zeitverschwendung *2026-04-24, version 3.5.0* Bei den Suchergebnissen steht kein Preis damit es so aussieht als wäre es kostenlos ### 5/5 — 𝓑 *2025-12-28, version 3.4.1* 𝓑 ### 5/5 — Impressive *2025-12-24* Very good **Developer response:** Thank you so much for your support! ### 5/5 — Free *2025-12-20, version 3.3.0* And brilliant ### 5/5 — Handy, useful tool *2025-11-17* Useful tool to get approximate frequency of colored lights in nm **Developer response:** Thanks a lot for your review! ### 5/5 — seems pretty good *2025-10-26, version 3.3.0* ✌️ ### 5/5 — Great little app! *2025-09-18, version 3.2.1* Very handy for demonstrating, or determining, the wavelength of a given colour and so easy to use. Would be ideal for use in the classroom and a lot cheaper than spectrometer! Also, I contacted Björn with a technical question and he was extremely helpful and prompt in his replies. Great guy! ### 5/5 — works *2025-09-17, version 3.2.1* cool ## Frequently asked questions about Light Spectrometer Wavelength ### What does the Light Spectrometer app do? This app measures the light spectrum to determine the dominant wavelength in nanometers (nm), frequency in terahertz (THz), and period length in femtoseconds (fs). It is designed for analyzing colored light sources and providing real-time measurements. ### What are the key features of this app? Key features include high accuracy, real-time measurement, measurement of wavelength in nm, frequency in THz, and period length in fs. It also allows users to save measurements with notes, supports many languages, and offers optional calibration for enhanced precision. ### Is this app free to use? The app is free to download and use, but it offers in-app purchases. These purchases may be for features like calibration or other enhancements to the measurement capabilities. ### What are the limitations of this app? Smartphone cameras have inherent limitations in distinguishing very short or very long wavelengths. Accuracy may be limited below 465 nm and above 610 nm due to physical camera sensors. An automatic warning appears on the screen for these wavelengths. ### Can I use this app to measure white light or the color of surfaces? This app is not meaningful for measuring white light as it consists of a wide range of wavelengths. It is made for measuring colored light. For measuring the color of a surface or material, you would need a different application like a Colorimeter Camera Color Meter app. ## Version history (last 5 releases) ### 3.7.1 — 2026-07-03 • 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! ### 3.6.0 — 2026-05-19 • 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! ### 3.5.0 — 2026-03-02 • 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! ### 3.4.1 — 2025-12-17 • Added the possibility to export saved measurements ### 3.3.0 — 2025-10-17 • Added the possibility to save measurements with comments • Corrected erroneous period length calculation • Improved text and images explaining the app ## Apps similar to Light Spectrometer Wavelength | App | Rating | Price | Category | | --- | --- | --- | --- | | [Photo Light & Exposure Meter](https://appshunter.io/ios/app/photo-light-and-exposure-meter/id1297903210) | 4.5 (3,242) | Free | Utilities | | [Flashlight for iPhone + iPad](https://appshunter.io/ios/app/flashlight-for-iphone-plus-ipad/id388838723) | 4.5 (133,632) | Free | Utilities | | [Light Meter: Lux-525 Pro](https://appshunter.io/ios/app/light-meter-lux-525-pro/id1636117065) | 4.5 (113) | Free | Utilities | | [Photone - Grow Light Meter](https://appshunter.io/ios/app/photone-grow-light-meter/id1450079523) | 4.6 (4,889) | Free | Utilities | | [App for Light meter controller](https://appshunter.io/ios/app/app-for-light-meter-controller/id6670164188) | 5.0 (18) | Free | Utilities | | [Flicker Meter for Light - PWM](https://appshunter.io/ios/app/flicker-meter-for-light-pwm/id1672848632) | 4.6 (47) | Free | Utilities | ## More apps by Contechity AB - [Flicker Meter for Light - PWM](https://appshunter.io/ios/app/flicker-meter-for-light-pwm/id1672848632) - [White Balance Kelvin Meter](https://appshunter.io/ios/app/white-balance-kelvin-meter/id6443791592) - [Colorimeter Camera Color Meter](https://appshunter.io/ios/app/colorimeter-camera-color-meter/id6449255688) - [Lux Light Meter Photography](https://appshunter.io/ios/app/lux-light-meter-photography/id6478221966) - [Screen Brightness Nits Meter](https://appshunter.io/ios/app/screen-brightness-nits-meter/id6749894754) All apps by Contechity AB: https://appshunter.io/developer/1649290454 ## Related topics [light wavelength](https://appshunter.io/ios/topics/light-wavelength) · [spectrum analyzer light](https://appshunter.io/ios/topics/spectrum-analyzer-light) · [wavelength solo](https://appshunter.io/ios/topics/wavelength-solo) · [contechity ab](https://appshunter.io/ios/topics/contechity-ab) · [spectrum wavelength](https://appshunter.io/ios/topics/spectrum-wavelength) · [spectroscopy](https://appshunter.io/ios/topics/spectroscopy) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*