# Owlio vs Image Stack

The clearest difference is ads: Image Stack at none against Owlio's shown. Image Stack also leads on device support (3 vs 1). Owlio's advantage is update cadence (every 3 days vs monthly). On price, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Owlio sells 2 in-app purchases, starting at $9.99 per month and Image Stack sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Owlio ships an update every 3 days, Image Stack monthly. The most recent releases landed on September 23, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Owlio | Image Stack |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Monthly |
| Monetization | — | Free with in-app purchases |
| Size | 425 MB | 13 MB |
| Requires iOS | **17.4** | 18.0 |
| Devices | iPhone | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Owlio Inc](https://appshunter.io/developer/1448043412) | [Daniel Witt](https://appshunter.io/developer/1438848391) |

## What reviewers say

### Owlio

[App page](https://appshunter.io/ios/app/owlio/id1448043413)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $9.99 | per month |
| Yearly | $59.99 | per year |


### Image Stack

[App page](https://appshunter.io/ios/app/image-stack/id6757393848)

This app streamlines image processing by allowing batch conversion, resizing, and renaming. Apply presets, add watermarks, and adjust quality settings with ease. It's designed for efficient handling of multiple images across devices.

**Highlights:** Batch image conversion, Apply multiple presets, Rename files, Resize images, Add overlays/watermarks, Adjust quality and metadata, iCloud preset sync

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $9.99 | one-time |


## Frequently asked questions

### Is Owlio free?

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

### Is Image Stack free?

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

### Do Owlio or Image Stack have ads?

Owlio shows ads; Image Stack does not.

### Which is updated more often, Owlio or Image Stack?

Owlio ships an update every 3 days, and Image Stack monthly. Most recently, Owlio was updated on September 23, 2026 and Image Stack on September 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.*