# Shelfs vs Kellr

The clearest difference is in-app purchases: Shelfs at none against Kellr's 2. Shelfs also leads on update cadence (every 2 days vs every 5 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Kellr sells 2 in-app purchases, starting at $2.99 per month. Shelfs asks for nothing beyond the download.

Shelfs ships an update every 2 days, Kellr every 5 days. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Shelfs | Kellr |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 5 days |
| Size | 2 MB | 7 MB |
| Requires iOS | 17.5 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Christoph Rohrer](https://appshunter.io/developer/1565870559) | [Michael Seidl](https://appshunter.io/developer/1881336205) |

## What reviewers say

### Shelfs

[App page](https://appshunter.io/ios/app/shelfs/id6504716820)

**Features:** macOS Compatibility

**In-app purchases:** none


### Kellr

[App page](https://appshunter.io/ios/app/kellr/id6759869739)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kellr Pro Monthly | $2.99 | per month |
| kellr Pro | $12.99 | per year |


## Frequently asked questions

### Is Shelfs free?

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

### Is Kellr free?

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

### Do Shelfs or Kellr have ads?

Neither Shelfs nor Kellr shows ads.

### Which is updated more often, Shelfs or Kellr?

Shelfs ships an update every 2 days, and Kellr every 5 days. Most recently, Shelfs was updated on October 27, 2026 and Kellr on October 24, 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.*