# Diffraction Grating Calculator vs OSpectrometer

The clearest difference is price: OSpectrometer at Free against Diffraction Grating Calculator's $2.99. OSpectrometer also leads on update cadence (every 2 weeks vs every 29 months). Diffraction Grating Calculator's advantage is in-app purchases (none vs 2) and iOS requirement (13 vs 15.1). On ads and device support there is nothing between them.

OSpectrometer is free to download; Diffraction Grating Calculator costs $2.99 up front. OSpectrometer sells 2 in-app purchases, starting at $2.99 per month. Diffraction Grating Calculator asks for nothing beyond the download.

Diffraction Grating Calculator ships an update every 29 months, OSpectrometer every 2 weeks. Both last shipped on September 29, 2026.

## The numbers

| Metric | Diffraction Grating Calculator | OSpectrometer |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[2.0 (4 ratings)](https://appshunter.io/ios/app/ospectrometer/id6446124449/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 2 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 1 MB | 71 MB |
| Requires iOS | **13** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [NANO ELECTRONICS RESEARCH MUHENDISLIK ARASTIRMA GELISTIRME LIMITED SIRKETI](https://appshunter.io/developer/1674573382) |

## What reviewers say

### Diffraction Grating Calculator

[App page](https://appshunter.io/ios/app/diffraction-grating-calculator/id1413088894)

**Features:** macOS Compatibility

**In-app purchases:** none


### OSpectrometer

[App page](https://appshunter.io/ios/app/ospectrometer/id6446124449)

This app uses your device's camera and screen to perform basic optical spectroscopy. Analyze the visible light spectrum of objects, map light wavelengths to RGB values, and save or share your findings. It functions offline without external hardware.

**Highlights:** Visible light spectrum analysis, RGB color value mapping, Wavelength selection and scanning, Front camera reflection sensing, Save and share results, Offline functionality

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| month | $2.99 | per month |
| year | $9.99 | per year |


## Frequently asked questions

### Is Diffraction Grating Calculator free?

Diffraction Grating Calculator costs $2.99, with no in-app purchases.

### Is OSpectrometer free?

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

### Do Diffraction Grating Calculator or OSpectrometer have ads?

Neither Diffraction Grating Calculator nor OSpectrometer shows ads.

### Which is updated more often, Diffraction Grating Calculator or OSpectrometer?

Diffraction Grating Calculator ships an update every 29 months, and OSpectrometer every 2 weeks. Most recently, Diffraction Grating Calculator was updated on September 29, 2026 and OSpectrometer on September 29, 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.*