# Image to PDF vs STACK

The clearest difference is ads: STACK at none against Image to PDF's shown. STACK also leads on update cadence (every 8 days vs every 5 weeks) and iOS requirement (13.0 vs 16.0). On price, 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.

Image to PDF ships an update every 5 weeks, STACK every 8 days. The most recent releases landed on October 12, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Image to PDF | STACK |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Every 8 days** |
| Size | 5 MB | 18 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [4Hours Soft](https://appshunter.io/developer/671933491) | [Wen-Jen Chen](https://appshunter.io/developer/6792604689) |

## What reviewers say

### Image to PDF

[App page](https://appshunter.io/ios/app/image-to-pdf-fast-and-simple/id6756531392)

**Features:** macOS Compatibility

**In-app purchases:** none


### STACK

[App page](https://appshunter.io/ios/app/stack-poker-chips/id6806127271)

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

**In-app purchases:** none


## Frequently asked questions

### Is Image to PDF free?

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

### Is STACK free?

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

### Do Image to PDF or STACK have ads?

Image to PDF shows ads; STACK does not.

### Which is updated more often, Image to PDF or STACK?

Image to PDF ships an update every 5 weeks, and STACK every 8 days. Most recently, Image to PDF was updated on October 12, 2026 and STACK 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.*