DuoGain Buy & Sell Marketplace
No fees to buy, list and sell
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Shop safely with Buyer Protection on all items sold through DuoGain. No AI allowed, no fees to sell + up to a 10% bonus on every sale.
Our No AI, Human First Mission
To maintain the integrity of our marketplace, we do not allow AI-generated images, descriptions or items of any kind.
Every item you see on DuoGain is a real item, listed and photographed by a real person.
Our community is moderated collectors like you who also wants to create a human first future!
Why DuoGain?
For sellers
- Free to List & Sell
List your items with no upfront fees and no DuoGain fees when your item sells.
- Free prepaid shipping labels for single photocards!
- Get up to 10 percent extra in app bonus cash on each sale which you can use to get anything on the app for free!
- Instant PayPal Payouts
Make money with DuoGain! Get paid instantly after each sale, straight to your PayPal.
- Simple 3-Step Selling
List → Get Paid → Ship. That’s it.
- Nationwide Reach
List once and reach buyers in all 50 U.S. states.
For Buyers
- A fresh marketplace where all items are listed by people without any AI alteration.
- Buy with Confidence
Enjoy buyer protection, PayPal-backed payments, and an easy dispute process directly on the app if things go wrong.
Also, if you run into any additional concerns, our team is here. Talk to a real human with any questions or concerns!
EXPLORE A WORLD OF POPULAR BRANDS
Top Picks in Apparel & Footwear
- Shop must-haves from H&M, Zara, Aritzia, and Free People
- Sneakers and streetwear from Nike, New Balance, Converse, and Reebok
Gadgets, Gear & Tech Deals
- Apple, Samsung, and Google Pixel phones
- Tablets, earbuds, and smartwatches
- Gaming gear from Nintendo, Xbox, and PlayStation
Niche Finds & Fandom Favorites
- Funko Pops, Banpresto figures, and My Hero Academia merch
- LEGO sets, Beyblades, and Pokémon plushies
- Hello Kitty, Sanrio, and BT21 collectibles
- Twice, BTS, Stray Kids, NCT, Seventeen, and Blackpink albums and photocards
Vintage & Pre-Owned Electronics
- Retro consoles like Game Boy, PSP, and Wii
- Laptops, cameras, lenses, and accessories
- Home audio and instruments from Yamaha, Roland, and Casio
Kids’ Clothing & Toys
- Brands like Carter’s, Hanna Andersson, and Burt’s Bees Baby
- Toys from Melissa & Doug, VTech, and LeapFrog
Affordable Designer Picks
- Shop secondhand pieces from Coach, Michael Kors, and Kate Spade
- Explore unique finds from Tory Burch, Marc Jacobs, and Fossil
Key Features
- No listing or selling fees for all casual sellers.
- User-Friendly Interface: List and browse items effortlessly.
- Secure PayPal payments
- Nationwide Reach
- Available to U.S. users (18+)
- Growing fast! We're just getting started!
Ready to Buy or Sell?
Join DuoGain and start using the marketplace app built for everyday people, whether you're selling a rare trading card, a retro game, shoes, shirts, or clearing out old tech. It’s free to list, easy to use, and designed to help you keep more of what you earn.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Free prepaid shipping labels for single photocards!
The developer, DuoGain, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Location
- Contact Info
- User Content
- Search History
- Browsing History
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- DUOGAIN INC.
- Size
- 78.3 MB
- Category
- Shopping
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Contains
Advertising
Messaging and Chat
User-Generated Content
- Copyright
- © 2026 DuoGain Inc.