# Diffraction Grating Calculator vs Unarchiver

The clearest difference is price: Unarchiver at Free against Diffraction Grating Calculator's $2.99. Unarchiver also leads on update cadence (fortnightly vs every 29 months). Diffraction Grating Calculator's advantage is iOS requirement (13 vs 16.0). On ads, in-app purchases and device support there is nothing between them.

Unarchiver is free to download; Diffraction Grating Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Diffraction Grating Calculator ships an update every 29 months, Unarchiver fortnightly. Both last shipped on October 27, 2026.

## The numbers

| Metric | Diffraction Grating Calculator | Unarchiver |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[4.6 (326 ratings)](https://appshunter.io/ios/app/unarchiver-zip-rar/id1552555240/reviews)** |
| Number of ratings | — | **326** |
| Positive reviews | — | 90.9% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Fortnightly** |
| Monetization | — | Free |
| Size | 1 MB | 18 MB |
| Requires iOS | **13** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Vision Pro |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [林峰 李](https://appshunter.io/developer/1186547508) |

## What reviewers say

### Diffraction Grating Calculator

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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Unarchiver

[App page](https://appshunter.io/ios/app/unarchiver-zip-rar/id1552555240)

Easily extract, browse, and create archives. Supports a wide range of formats including RAR and ZIP, even password-protected ones. Preview files within archives without full extraction.

**Highlights:** Extracts various archive formats, Browses archive contents, Previews files within archives, Creates new archives, Supports password-protected archives, Integrates with share sheets

**Features:** iPhone Duo support

**In-app purchases:** none


## Frequently asked questions

### Is Diffraction Grating Calculator free?

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

### Is Unarchiver free?

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

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

Neither Diffraction Grating Calculator nor Unarchiver shows ads.

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

Diffraction Grating Calculator ships an update every 29 months, and Unarchiver fortnightly. Most recently, Diffraction Grating Calculator was updated on October 27, 2026 and Unarchiver on October 27, 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.*