# Diffraction Grating Calculator vs XLSX Reader Converter XLS PDF

The clearest difference is price: XLSX Reader Converter XLS PDF at Free against Diffraction Grating Calculator's $2.99. XLSX Reader Converter XLS PDF also leads on update cadence (every 3 days vs every 29 months) and iOS requirement (11.0 vs 13). On ads, in-app purchases and device support there is nothing between them.

XLSX Reader Converter XLS PDF 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, XLSX Reader Converter XLS PDF every 3 days. The most recent releases landed on September 29, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Diffraction Grating Calculator | XLSX Reader Converter XLS PDF |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[4.0 (6 ratings)](https://appshunter.io/ios/app/xlsx-reader-converter-xls-pdf/id6476379813/reviews)** |
| Number of ratings | — | **6** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 3 days** |
| Monetization | — | Free |
| Size | 1 MB | 35 MB |
| Requires iOS | 13 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | +4 |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [NEURASYNC](https://appshunter.io/developer/1639101560) |

## What reviewers say

### Diffraction Grating Calculator

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

**Features:** macOS Compatibility

**In-app purchases:** none


### XLSX Reader Converter XLS PDF

[App page](https://appshunter.io/ios/app/xlsx-reader-converter-xls-pdf/id6476379813)

Effortlessly open, view, and convert XLSX and XLS files. Convert to PDF, CSV, or older XLS formats, and upgrade legacy XLS files to XLSX. Handles batch processing and maintains data integrity.

**Highlights:** XLSX file reader, XLSX to PDF conversion, XLSX to CSV conversion, XLSX to XLS conversion, XLS to XLSX conversion, Batch processing, Data integrity preservation

**Features:** macOS Compatibility, 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 XLSX Reader Converter XLS PDF free?

XLSX Reader Converter XLS PDF is free to download, with no in-app purchases.

### Do Diffraction Grating Calculator or XLSX Reader Converter XLS PDF have ads?

Neither Diffraction Grating Calculator nor XLSX Reader Converter XLS PDF shows ads.

### Which is updated more often, Diffraction Grating Calculator or XLSX Reader Converter XLS PDF?

Diffraction Grating Calculator ships an update every 29 months, and XLSX Reader Converter XLS PDF every 3 days. Most recently, Diffraction Grating Calculator was updated on September 29, 2026 and XLSX Reader Converter XLS PDF on October 10, 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.*