# Bring a Trailer Auctions vs Undrdog

Bring a Trailer Auctions and Undrdog both sit at 4.9 stars, but that hides the real split: 100% of Undrdog's written reviews are positive against 36% of Bring a Trailer Auctions's. Undrdog also leads on monetization model (free vs free with in-app purchases) and iOS requirement (15.1 vs 17.0). Bring a Trailer Auctions's advantage is ratings volume (7.8K vs 43) and update cadence (fortnightly vs every 2 months). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for Bring a Trailer Auctions against 5.0 for Undrdog. That said, the two scores are not equally well evidenced: Bring a Trailer Auctions has 7.8K ratings behind it against 43, so its average is the more settled of the two. Written reviews are what separate them: 36% of Bring a Trailer Auctions's written reviews are positive against 100% of Undrdog's.

Bring a Trailer Auctions ships an update fortnightly, Undrdog every 2 months. The most recent releases landed on November 1, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Bring a Trailer Auctions | Undrdog |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (7.8K ratings)](https://appshunter.io/ios/app/bring-a-trailer-auctions/id6447379882/reviews) | **[5.0 (43 ratings)](https://appshunter.io/ios/app/undrdog/id6754082581/reviews)** |
| Number of ratings | **7.8K** | 43 |
| Positive reviews | 36.1% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 77 MB | 75 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Bring A Trailer](https://appshunter.io/developer/1636325483) | [joel accuardi](https://appshunter.io/developer/1855409412) |

## What reviewers say

### Bring a Trailer Auctions

[App page](https://appshunter.io/ios/app/bring-a-trailer-auctions/id6447379882)

Discover, discuss, and buy classic and collector vehicles through transparent auctions. Engage with a knowledgeable community and receive real-time updates on your favorite listings. Bid with confidence thanks to community vetting and sniping protection.

**Highlights:** Browse and bid on vehicles, Transparent auction listings, Community vetting and discussion, Custom alerts and notifications, Sniping protection, Watchlist functionality, Explore results with charts

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Great marketplace and app
- 👍 Excellent for car enthusiasts
- 💡 Continues to improve

**What reviewers complain about**

- 🐛 Glitchy and buggy
- 🔍 Lacks important search filters
- 💻 Poor design and UX

**Reported bugs**

- Login issues
- Slow loading and freezing
- Notifications overload

**Requested features**

- Add filter by location/distance
- Improve bidding interface
- Optimize for iPad


### Undrdog

[App page](https://appshunter.io/ios/app/undrdog/id6754082581)

Discover premium auto and marine detailing supplies with an intuitive shopping experience. Easily browse, purchase, and manage loyalty points. Access Carfax uploads and find local detailers.

**Highlights:** Curated selection of detailing supplies, Intuitive browsing and purchasing, Carfax upload access, Find a Detailer map, Loyalty points tracking, Secure transactions

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Bring a Trailer Auctions free?

Bring a Trailer Auctions is free to download, with no in-app purchases.

### Is Undrdog free?

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

### Which has better reviews, Bring a Trailer Auctions or Undrdog?

Undrdog is rated higher. Bring a Trailer Auctions averages 4.9 out of 5 from 7.8K ratings, while Undrdog averages 5.0 from 43 ratings.

### Do Bring a Trailer Auctions or Undrdog have ads?

Neither Bring a Trailer Auctions nor Undrdog shows ads.

### Which is updated more often, Bring a Trailer Auctions or Undrdog?

Bring a Trailer Auctions ships an update fortnightly, and Undrdog every 2 months. Most recently, Bring a Trailer Auctions was updated on November 1, 2026 and Undrdog 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.*