# Light Spectrometer Wavelength vs RevDash

The clearest difference is price: Light Spectrometer Wavelength at Free against RevDash's $1.99. Light Spectrometer Wavelength also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). RevDash's advantage is in-app purchases (none vs 7) and update cadence (every 3 days vs every 2 months). On ads there is nothing between them.

Light Spectrometer Wavelength is free to download; RevDash costs $1.99 up front. Light Spectrometer Wavelength sells 4 in-app purchases, starting at $0.99 per month. RevDash asks for nothing beyond the download.

Light Spectrometer Wavelength ships an update every 2 months, RevDash every 3 days. The most recent releases landed on September 22, 2026 and September 4, 2026 respectively.

## The numbers

| Metric | Light Spectrometer Wavelength | RevDash |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| 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 | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 43 MB | 14 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Contechity AB](https://appshunter.io/developer/1649290454) | [Joshua Figueroa](https://appshunter.io/developer/1759474900) |

## 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 |


### RevDash

[App page](https://appshunter.io/ios/app/revdash/id6764164749)

**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 RevDash free?

RevDash costs $1.99, with no in-app purchases.

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

Neither Light Spectrometer Wavelength nor RevDash shows ads.

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

Light Spectrometer Wavelength ships an update every 2 months, and RevDash every 3 days. Most recently, Light Spectrometer Wavelength was updated on September 22, 2026 and RevDash on September 4, 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.*