# Only Markdown vs CalcStak

The clearest difference is in-app purchases: Only Markdown at none against CalcStak's 1. Only Markdown also leads on device support (3 vs 1) and iOS requirement (11.0 vs 17.0). On price and ads there is nothing between them.

Both are free to download. CalcStak sells 1 one-off in-app purchase. Only Markdown asks for nothing beyond the download.

## The numbers

| Metric | Only Markdown | CalcStak |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Size | 27 MB | 1 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [丽荣 李](https://appshunter.io/developer/1656476844) | [JOEL ANDREW ROSINBUM](https://appshunter.io/developer/1896305700) |

## What reviewers say

### Only Markdown

[App page](https://appshunter.io/ios/app/only-markdown/id6471973955)

**Features:** macOS Compatibility

**In-app purchases:** none


### CalcStak

[App page](https://appshunter.io/ios/app/calcstak/id6766592809)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Scientific Functions | $2.99 | one-time |


## Frequently asked questions

### Is Only Markdown free?

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

### Is CalcStak free?

CalcStak is free to download, with in-app purchases available.

### Do Only Markdown or CalcStak have ads?

Neither Only Markdown nor CalcStak shows ads.

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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.*