# Epson Spectrometer vs Light Spectrometer Wavelength

The clearest difference is rating: Epson Spectrometer at 5.0 against Light Spectrometer Wavelength's 4.2. Epson Spectrometer also leads on in-app purchases (none vs 7). Light Spectrometer Wavelength's advantage is ratings volume (96 vs 4). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Light Spectrometer Wavelength sells 4 in-app purchases, starting at $0.99 per month. Epson Spectrometer asks for nothing beyond the download.

Epson Spectrometer holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Light Spectrometer Wavelength has 96 ratings behind it against 4, so its average is the more settled of the two.

Epson Spectrometer ships an update every 3 months, Light Spectrometer Wavelength every 2 months. The most recent releases landed on October 14, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Epson Spectrometer | Light Spectrometer Wavelength |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/epson-spectrometer/id1558626654/reviews)** | [4.2 (96 ratings)](https://appshunter.io/ios/app/light-spectrometer-wavelength/id6450930820/reviews) |
| Number of ratings | 4 | **96** |
| Positive reviews | — | 70.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 57 MB | 43 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Seiko Epson Corporation](https://appshunter.io/developer/326876195) | [Contechity AB](https://appshunter.io/developer/1649290454) |

## What reviewers say

### Epson Spectrometer

[App page](https://appshunter.io/ios/app/epson-spectrometer/id1558626654)

This utility app enables precise color measurement of indoor and outdoor materials using a compatible spectrophotometer. It allows users to manage, compare, and adjust colors, and even check printer color reproduction capabilities.

**Highlights:** Portable color measurement, Import measurement data via Bluetooth, Manage colors as reference colors, Compare colors to Color Collections, Check printer color reproduction, Adjust color measurements, Create custom Color Collections

**Features:** Vision Pro support

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Epson Spectrometer free?

Epson Spectrometer is free to download, with no in-app purchases.

### Is Light Spectrometer Wavelength free?

Light Spectrometer Wavelength is free to download, with in-app purchases available.

### Which has better reviews, Epson Spectrometer or Light Spectrometer Wavelength?

Epson Spectrometer is rated higher. Epson Spectrometer averages 5.0 out of 5 from 4 ratings, while Light Spectrometer Wavelength averages 4.2 from 96 ratings.

### Do Epson Spectrometer or Light Spectrometer Wavelength have ads?

Neither Epson Spectrometer nor Light Spectrometer Wavelength shows ads.

### Which is updated more often, Epson Spectrometer or Light Spectrometer Wavelength?

Epson Spectrometer ships an update every 3 months, and Light Spectrometer Wavelength every 2 months. Most recently, Epson Spectrometer was updated on October 14, 2026 and Light Spectrometer Wavelength on October 27, 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.*