# Block’s Marble Auctions vs Koso App

The clearest difference is update cadence: Koso App at every 9 days against Block’s Marble Auctions's every 11 months. Block’s Marble Auctions's advantage is iOS requirement (12.0 vs 15.1). 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.

Block’s Marble Auctions ships an update every 11 months, Koso App every 9 days. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Block’s Marble Auctions | Koso App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/blocks-marble-auctions/id6739694618/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 9 days** |
| Monetization | Free | — |
| Size | 55 MB | 34 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Bidsquare](https://appshunter.io/developer/1575528389) | [Koso med](https://appshunter.io/developer/6791905407) |

## What reviewers say

### Block’s Marble Auctions

[App page](https://appshunter.io/ios/app/blocks-marble-auctions/id6739694618)

Participate in live marble auctions from your mobile device. Preview upcoming lots, track your bidding history, and receive notifications for items of interest. This app allows you to bid on antique, vintage, and contemporary marbles and related collectibles.

**Highlights:** Preview upcoming lots, Watch live auctions, Bid in real-time, Quick registration, Track bidding history, Push notifications for items of interest

**Features:** macOS Compatibility

**In-app purchases:** none


### Koso App

[App page](https://appshunter.io/ios/app/koso-app/id6791905405)

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

**In-app purchases:** none


## Frequently asked questions

### Is Block’s Marble Auctions free?

Block’s Marble Auctions is free to download, with no in-app purchases.

### Is Koso App free?

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

### Do Block’s Marble Auctions or Koso App have ads?

Neither Block’s Marble Auctions nor Koso App shows ads.

### Which is updated more often, Block’s Marble Auctions or Koso App?

Block’s Marble Auctions ships an update every 11 months, and Koso App every 9 days. Most recently, Block’s Marble Auctions was updated on October 30, 2026 and Koso App on October 25, 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.*