# Diffraction Grating Calculator vs Matrix Calc Plus

The clearest difference is iOS requirement: Diffraction Grating Calculator at 13 against Matrix Calc Plus's 18.2. On price, update cadence, ads and in-app purchases there is nothing between them.

Diffraction Grating Calculator costs $2.99 and Matrix Calc Plus $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, Matrix Calc Plus every 26 months. The most recent releases landed on May 19, 2026 and June 9, 2026 respectively.

## The numbers

| Metric | Diffraction Grating Calculator | Matrix Calc Plus |
| --- | --- | --- |
| Price | $2.99 | $2.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 26 months** |
| Size | 1 MB | 9 MB |
| Requires iOS | **13** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Tan Chia Ling](https://appshunter.io/developer/321121189) | [Heng Jia Liang](https://appshunter.io/developer/1532000635) |

## What reviewers say

### Diffraction Grating Calculator

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Matrix Calc Plus

[App page](https://appshunter.io/ios/app/matrix-calc-plus/id1592961256)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Diffraction Grating Calculator free?

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

### Is Matrix Calc Plus free?

Matrix Calc Plus costs $2.99, with no in-app purchases.

### Do Diffraction Grating Calculator or Matrix Calc Plus have ads?

Neither Diffraction Grating Calculator nor Matrix Calc Plus shows ads.

### Which is updated more often, Diffraction Grating Calculator or Matrix Calc Plus?

Diffraction Grating Calculator ships an update every 29 months, and Matrix Calc Plus every 26 months. Most recently, Diffraction Grating Calculator was updated on May 19, 2026 and Matrix Calc Plus on June 9, 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.*