# Light Spectrometer Wavelength vs Luminosys

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.

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.

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.

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.

## The numbers

| Metric | Light Spectrometer Wavelength | Luminosys |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (96 ratings)](https://appshunter.io/ios/app/light-spectrometer-wavelength/id6450930820/reviews) | **[4.3 (10 ratings)](https://appshunter.io/ios/app/luminosys-light-meter/id6476405389/reviews)** |
| Number of ratings | **96** | 10 |
| Positive reviews | 70.6% of reviews | **75.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 19 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 43 MB | 3 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Contechity AB](https://appshunter.io/developer/1649290454) | [Melissa Zwick](https://appshunter.io/developer/1616726350) |

## What reviewers say

### Light Spectrometer Wavelength

[App page](https://appshunter.io/ios/app/light-spectrometer-wavelength/id6450930820)

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:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $0.99 | per month |
| Full access | $0.99 | per month |
| Full access | $4.99 | per year |
| Full access | $6.99 | one-time |


### Luminosys

[App page](https://appshunter.io/ios/app/luminosys-light-meter/id6476405389)

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

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*