# DoomStudy vs marrow

The clearest difference is update cadence: marrow at every 3 days against DoomStudy's weekly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

DoomStudy ships an update weekly, marrow every 3 days. The most recent releases landed on October 1, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | DoomStudy | marrow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | **Every 3 days** |
| Size | 90 MB | 40 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jalal Fatouaki](https://appshunter.io/developer/1855953539) | [Pratyush Saxena](https://appshunter.io/developer/1896770612) |

## What reviewers say

### DoomStudy

[App page](https://appshunter.io/ios/app/doomstudy-scroll-to-learn/id6755923722)

**Features:** macOS Compatibility

**In-app purchases:** none


### marrow

[App page](https://appshunter.io/ios/app/marrow-scroll-to-learn/id6791669414)

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

**In-app purchases:** none


## Frequently asked questions

### Is DoomStudy free?

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

### Is marrow free?

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

### Do DoomStudy or marrow have ads?

Neither DoomStudy nor marrow shows ads.

### Which is updated more often, DoomStudy or marrow?

DoomStudy ships an update weekly, and marrow every 3 days. Most recently, DoomStudy was updated on October 1, 2026 and marrow on September 28, 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.*