Comparison

Light Spectrometer Wavelength vs VSensors

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

VSensors

This application connects to multiple Bluetooth sensors to monitor environmental conditions like illumination, temperature, humidity, and noise. It displays data in maximum/minimum modes, line charts, and tables, with export options available. Requires Vevor Bluetooth Sensor Series and iOS 9.0 or later.

Highlights
  • Connects multiple Bluetooth sensors simultaneously
  • Monitors illumination, temperature, humidity, and noise
  • Maximum and minimum display modes
  • Line chart and data table views
  • Data export in various formats
Features
Read full description

Application features: - Multiple Bluetooth sensors, such as illumination, temperature and humidity, noise, etc., can be automatically connected at the same time - Includes maximum minimum display mode - Includes line chart view - Includes view of the data table - Data can be exported in a variety of formats Preconditions for using: - Use the Vevor Bluetooth Sensor Series - IOS 9.0 or an updated version is required to support Bluetooth 4.0 and above devices

Screenshots

Light Spectrometer Wavelength4 screens
VSensors3 screens

Verdict

The call

The clearest difference is review sentiment: Light Spectrometer Wavelength at 71% against VSensors's 0%. Light Spectrometer Wavelength also leads on rating (4.2 vs 2.3) and update cadence (every 2 months vs every 7 months). VSensors's advantage is in-app purchases (none vs 7) and iOS requirement (12.0 vs 15.0). On price, ads and device support 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. VSensors asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Light Spectrometer Wavelength holds the better App Store score, 4.2 against 2.3. That said, the two scores are not equally well evidenced: Light Spectrometer Wavelength has 96 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 71% of Light Spectrometer Wavelength's written reviews are positive against 0% of VSensors's.

UpkeepUpdate frequency

Light Spectrometer Wavelength ships an update every 2 months, VSensors every 7 months. Both last shipped on November 3, 2026.

Scorecard7 real differences · 3 level
Light Spectrometer Wavelength versus VSensors: the parameters behind the verdict, then further details
ParameterLight Spectrometer WavelengthVSensors
PriceFreeFree
Rating4.2 (96 ratings) — better2.3 (6 ratings)
Positive reviews70.6% of reviews — better0.0% of reviews
Number of ratings96 — better6
Update frequencyEvery 2 months — betterEvery 7 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.012.0 — better
Further details — not scored
Size43 MB43 MB
Age rating4+17+
DeveloperContechity ABZHANGZHOU EASTERN INTELLIGENT METER CO., LTD.

Customer experience

Light Spectrometer Wavelength

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

VSensors

All ratings7 ratings
Positive28.6%
Neutral0.0%
Negative71.4%
Written reviews3 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

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

VSensors

No in-app purchases

Questions

Is Light Spectrometer Wavelength free?
Light Spectrometer Wavelength is free to download, with in-app purchases available.
Is VSensors free?
VSensors is free to download, with no in-app purchases.
Which has better reviews, Light Spectrometer Wavelength or VSensors?
Light Spectrometer Wavelength is rated higher. Light Spectrometer Wavelength averages 4.2 out of 5 from 96 ratings, while VSensors averages 2.3 from 6 ratings.
Do Light Spectrometer Wavelength or VSensors have ads?
Neither Light Spectrometer Wavelength nor VSensors shows ads.
Which is updated more often, Light Spectrometer Wavelength or VSensors?
Light Spectrometer Wavelength ships an update every 2 months, and VSensors every 7 months. Most recently, Light Spectrometer Wavelength was updated on November 3, 2026 and VSensors on November 3, 2026.

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