SidelineSwap vs Undrdog
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SidelineSwap
This app connects athletes to buy and sell sports equipment. Find new and used gear at significant discounts or easily list your own items to earn cash. Join a global community of athletes trading their sports essentials.
- Shop new and used sports equipment
- Save up to 70% on gear
- Sell equipment in minutes
- Prepaid shipping labels provided
- Global marketplace for athletes
Read full descriptionHide full description
SidelineSwap is where athletes buy and sell their gear. SHOP Shop new and used sports equipment up to 70% off – everything from hockey skates and golf clubs to lacrosse sticks and baseball gloves. SELL Sell in minutes – snap a photo, set a price, and receive a prepaid shipping label when the item sells. Cash in on last season’s gear, or list that old bike - or pair of skis - cluttering your garage. JOIN Join the leading marketplace for athletes. Buy and sell with hundreds of thousands of SidelineSwap users across the world.
Undrdog
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.
- Curated selection of detailing supplies
- Intuitive browsing and purchasing
- Carfax upload access
- Find a Detailer map
- Loyalty points tracking
- Secure transactions
Read full descriptionHide full description
Experience seamless shopping with Undrdog Surface Products, your premier destination for high-quality auto and marine detailing supplies. Discover a curated selection of premium products designed to deliver lasting protection and a brilliant shine for your vehicles. Our intuitive interface makes browsing and purchasing a breeze, ensuring that you find exactly what you need with just a few taps. Accessing Carfax uploads, Find a Detailer map, and keeping track of your loyalty points is now fast and easy. With secure transactions powered by Shopify Payments, your financial details are safeguarded, allowing you to shop with confidence. Whether you're a car enthusiast or a boating aficionado, Undrdog has the products you need to keep your surfaces looking their best. Shop now for excellence in every detail!
Screenshots
Verdict
The clearest difference is update cadence: SidelineSwap at every 6 days against Undrdog's every 2 months. SidelineSwap also leads on ratings volume (59K vs 16). Undrdog's advantage is monetization model (free vs ad-supported) and iOS requirement (15.1 vs 17.4). On price, rating, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 SidelineSwap against 4.9 for Undrdog. That said, the two scores are not equally well evidenced: SidelineSwap has 59K ratings behind it against 16, so its average is the more settled of the two.
SidelineSwap ships an update every 6 days, Undrdog every 2 months. The most recent releases landed on October 1, 2026 and September 19, 2026 respectively.
| Parameter | SidelineSwap | Undrdog |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (59K ratings) | 4.9 (16 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 59K — better | 16 |
| Update frequency | Every 6 days — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 17.4 | 15.1 — better |
| Further details — not scored | ||
| Size | 79 MB | 75 MB |
| Age rating | 4+ | 4+ |
| Developer | SidelineSwap, Inc | joel accuardi |
Customer experience
SidelineSwap
Undrdog
Bugs and requests
SidelineSwap
Reported bugs
3 issues- App login issues
- Listing items gets stuck in draft status
- Notification badges not clearing properly
Requested features
4 requests- Add support for Canadian currency
- Allow sellers to rate buyers
- Improve in-app communication between buyers and sellers
- Provide more transparency on fees and policies
Undrdog
Not enough reviews yet to summarise bugs or requests.
In-app purchases
SidelineSwap
No in-app purchases
Undrdog
No in-app purchases
