# Red PDF Reader vs Karbywarby Todo

The clearest difference is update cadence: Karbywarby Todo at every 6 days against Red PDF Reader's every 3 months. Karbywarby Todo also leads on iOS requirement (15.0 vs 18). 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.

Red PDF Reader ships an update every 3 months, Karbywarby Todo every 6 days. The most recent releases landed on October 28, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Red PDF Reader | Karbywarby Todo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/karbywarby-todo-tasks/id6802448116/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 days** |
| Size | 4 MB | 5 MB |
| Requires iOS | 18 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Khurshed Gulov](https://appshunter.io/developer/1329538296) | [Lars Patzold](https://appshunter.io/developer/6802448118) |

## What reviewers say

### Red PDF Reader

[App page](https://appshunter.io/ios/app/red-pdf-reader/id6763583714)

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

**In-app purchases:** none


### Karbywarby Todo

[App page](https://appshunter.io/ios/app/karbywarby-todo-tasks/id6802448116)

**In-app purchases:** none


## Frequently asked questions

### Is Red PDF Reader free?

Red PDF Reader is free to download, with no in-app purchases.

### Is Karbywarby Todo free?

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

### Do Red PDF Reader or Karbywarby Todo have ads?

Neither Red PDF Reader nor Karbywarby Todo shows ads.

### Which is updated more often, Red PDF Reader or Karbywarby Todo?

Red PDF Reader ships an update every 3 months, and Karbywarby Todo every 6 days. Most recently, Red PDF Reader was updated on October 28, 2026 and Karbywarby Todo on October 29, 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.*