# Diffraction Grating Calculator vs VisualTimer byNSDev

The clearest difference is price: VisualTimer byNSDev at Free against Diffraction Grating Calculator's $2.99. Diffraction Grating Calculator's advantage is device support and iOS requirement (13 vs 17). On in-app purchases there is nothing between them.

VisualTimer byNSDev 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.

## The numbers

| Metric | Diffraction Grating Calculator | VisualTimer byNSDev |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Every 29 months | — |
| Size | 1 MB | 2 MB |
| Requires iOS | **13** | 17 |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [NIHON SYSTEM DEVELOPER CORPORATION](https://appshunter.io/developer/1198103734) |

## What reviewers say

### Diffraction Grating Calculator

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

**Features:** macOS Compatibility

**In-app purchases:** none


### VisualTimer byNSDev

[App page](https://appshunter.io/ios/app/visualtimer-bynsdev/id6752543102)

**In-app purchases:** none


## Frequently asked questions

### Is Diffraction Grating Calculator free?

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

### Is VisualTimer byNSDev free?

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

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*