# Light Spectrometer Wavelength vs IDEA

The clearest difference is rating: IDEA at 5.0 against Light Spectrometer Wavelength's 4.2. IDEA also leads on in-app purchases (none vs 7) and iOS requirement (12.0 vs 15.0). Light Spectrometer Wavelength's advantage is ratings volume (92 vs 1) and review sentiment (72% vs 50%). On price, 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. IDEA asks for nothing beyond the download.

IDEA 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 92 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 72% of Light Spectrometer Wavelength's written reviews are positive against 50% of IDEA's, so the app with the better star average is not the one people write more warmly about.

Light Spectrometer Wavelength ships an update every 2 months, IDEA every 6 months. The most recent releases landed on September 22, 2026 and September 2, 2026 respectively.

## The numbers

| Metric | Light Spectrometer Wavelength | IDEA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (92 ratings)](https://appshunter.io/ios/app/light-spectrometer-wavelength/id6450930820/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/idea-ble/id6667117980/reviews)** |
| Number of ratings | **92** | 1 |
| Positive reviews | **71.9% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 43 MB | 43 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Contechity AB](https://appshunter.io/developer/1649290454) | [和平 陈](https://appshunter.io/developer/1743103495) |

## 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 |


### IDEA

[App page](https://appshunter.io/ios/app/idea-ble/id6667117980)

This intelligent operation app allows users to customize product usage and expand functionality. It provides a convenient way to interact with specific company products and gain a deeper understanding of their features.

**Highlights:** Intelligent operation, Product customization, Expandable functions, Enhanced product understanding, Convenient user interface

**Features:** macOS Compatibility

**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 IDEA free?

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

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

IDEA is rated higher. Light Spectrometer Wavelength averages 4.2 out of 5 from 92 ratings, while IDEA averages 5.0 from 1 ratings.

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

Neither Light Spectrometer Wavelength nor IDEA shows ads.

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

Light Spectrometer Wavelength ships an update every 2 months, and IDEA every 6 months. Most recently, Light Spectrometer Wavelength was updated on September 22, 2026 and IDEA on September 2, 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.*