# CT Auction vs BITBUY

The clearest difference is in-app purchases: CT Auction at none against BITBUY's 1. CT Auction also leads on ads (none vs shown) and update cadence (every 2 weeks vs monthly). BITBUY's advantage is iOS requirement (13.0 vs 15.6). On price and device support there is nothing between them.

Both are free to download. BITBUY sells 1 in-app purchase, starting at $4.99 per month. CT Auction asks for nothing beyond the download.

CT Auction ships an update every 2 weeks, BITBUY monthly. The most recent releases landed on August 18, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | CT Auction | BITBUY |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ct-auction/id1525686514/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | Free | — |
| Size | 73 MB | 63 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [株式会社Mr.circulate](https://appshunter.io/developer/1253939688) | [株式会社ホーム・コム](https://appshunter.io/developer/1761071229) |

## What reviewers say

### CT Auction

[App page](https://appshunter.io/ios/app/ct-auction/id1525686514)

Access Japan's exclusive pre-owned luxury market. Source rare, authenticated items from trusted dealers with real-time B2B pricing and secure transactions.

**Highlights:** Access Japan's pre-owned luxury market, Discover rare and curated items, Source from trusted Japanese dealers, Real-time B2B market prices, Authenticated items, Secure transactions

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

**In-app purchases:** none


### BITBUY

[App page](https://appshunter.io/ios/app/bitbuy/id6608960824)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| アプリ利用料 | $4.99 | per month |


## Frequently asked questions

### Is CT Auction free?

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

### Is BITBUY free?

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

### Do CT Auction or BITBUY have ads?

BITBUY shows ads; CT Auction does not.

### Which is updated more often, CT Auction or BITBUY?

CT Auction ships an update every 2 weeks, and BITBUY monthly. Most recently, CT Auction was updated on August 18, 2026 and BITBUY on September 21, 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.*