# uSpectrumX vs Light Spectrometer Wavelength

The clearest difference is in-app purchases: uSpectrumX at none against Light Spectrometer Wavelength's 7. uSpectrumX also leads on iOS requirement (9.0 vs 15.0). 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. uSpectrumX asks for nothing beyond the download.

uSpectrumX ships an update every 3 months, Light Spectrometer Wavelength every 2 months. The most recent releases landed on September 16, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | uSpectrumX | Light Spectrometer Wavelength |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.2 (92 ratings)](https://appshunter.io/ios/app/light-spectrometer-wavelength/id6450930820/reviews)** |
| Number of ratings | — | **92** |
| Positive reviews | — | 71.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | — | Free with in-app purchases |
| Size | 25 MB | 43 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [United Power Research Technology Corporation](https://appshunter.io/developer/1501316337) | [Contechity AB](https://appshunter.io/developer/1649290454) |

## What reviewers say

### uSpectrumX

[App page](https://appshunter.io/ios/app/uspectrumx/id1318581445)

**Features:** macOS Compatibility

**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 uSpectrumX free?

uSpectrumX 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.

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

Neither uSpectrumX nor Light Spectrometer Wavelength shows ads.

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

uSpectrumX ships an update every 3 months, and Light Spectrometer Wavelength every 2 months. Most recently, uSpectrumX was updated on September 16, 2026 and Light Spectrometer Wavelength on September 22, 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.*