# Light Spectrometer Wavelength vs SEKONIC LD

The clearest difference is update cadence: Light Spectrometer Wavelength at every 2 months against SEKONIC LD's every 9 months. On price, ads, in-app purchases 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 and SEKONIC LD sells 2 in-app purchases, starting at $49.99 per 3 months. Whichever you choose, the download price is not the number that matters.

Light Spectrometer Wavelength ships an update every 2 months, SEKONIC LD every 9 months. The most recent releases landed on November 11, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Light Spectrometer Wavelength | SEKONIC LD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (98 ratings)](https://appshunter.io/ios/app/light-spectrometer-wavelength/id6450930820/reviews)** | — |
| Number of ratings | **98** | — |
| Positive reviews | 70.6% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 9 months |
| Monetization | Free with in-app purchases | — |
| Size | 43 MB | 33 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Contechity AB](https://appshunter.io/developer/1649290454) | [Sekonic](https://appshunter.io/developer/1526265807) |

## 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 |


### SEKONIC LD

[App page](https://appshunter.io/ios/app/sekonic-ld/id6478847348)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3 months subscription | $49.99 | per 3 months |
| 12 months subscription | $119.99 | per year |


## Frequently asked questions

### Is Light Spectrometer Wavelength free?

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

### Is SEKONIC LD free?

SEKONIC LD is free to download, with in-app purchases available.

### Do Light Spectrometer Wavelength or SEKONIC LD have ads?

Neither Light Spectrometer Wavelength nor SEKONIC LD shows ads.

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

Light Spectrometer Wavelength ships an update every 2 months, and SEKONIC LD every 9 months. Most recently, Light Spectrometer Wavelength was updated on November 11, 2026 and SEKONIC LD on November 8, 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.*