# Diffraction Grating Calculator vs DNS Speed Tester

The clearest difference is price: DNS Speed Tester at Free against Diffraction Grating Calculator's $2.99. DNS Speed Tester also leads on update cadence (every 10 days vs every 29 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

DNS Speed Tester 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, DNS Speed Tester every 10 days. The most recent releases landed on September 29, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Diffraction Grating Calculator | DNS Speed Tester |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 10 days** |
| Size | 1 MB | 6 MB |
| Requires iOS | **13** | 14.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Vishnu Nampoothiri UK](https://appshunter.io/developer/1579499876) |

## What reviewers say

### Diffraction Grating Calculator

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

**Features:** macOS Compatibility

**In-app purchases:** none


### DNS Speed Tester

[App page](https://appshunter.io/ios/app/dns-speed-tester/id6775122153)

**Features:** Vision Pro 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 DNS Speed Tester free?

DNS Speed Tester is free to download, with no in-app purchases.

### Do Diffraction Grating Calculator or DNS Speed Tester have ads?

Neither Diffraction Grating Calculator nor DNS Speed Tester shows ads.

### Which is updated more often, Diffraction Grating Calculator or DNS Speed Tester?

Diffraction Grating Calculator ships an update every 29 months, and DNS Speed Tester every 10 days. Most recently, Diffraction Grating Calculator was updated on September 29, 2026 and DNS Speed Tester on October 5, 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.*