# Sunflower vs Red PDF Reader

The clearest difference is update cadence: Red PDF Reader at every 3 months against Sunflower's every 11 months. Sunflower's advantage is iOS requirement (13.0 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.

Sunflower ships an update every 11 months, Red PDF Reader every 3 months. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Sunflower | Red PDF Reader |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 3 months** |
| Size | 44 MB | 4 MB |
| Requires iOS | **13.0** | 18 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Firefly Tech](https://appshunter.io/developer/1723741030) | [Khurshed Gulov](https://appshunter.io/developer/1329538296) |

## What reviewers say

### Sunflower

[App page](https://appshunter.io/ios/app/sunflower-pomodoro-focus-app/id6499127184)

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

**In-app purchases:** none


### Red PDF Reader

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

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

**In-app purchases:** none


## Frequently asked questions

### Is Sunflower free?

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

### Is Red PDF Reader free?

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

### Do Sunflower or Red PDF Reader have ads?

Neither Sunflower nor Red PDF Reader shows ads.

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

Sunflower ships an update every 11 months, and Red PDF Reader every 3 months. Most recently, Sunflower was updated on October 24, 2026 and Red PDF Reader on October 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.*