- For buying used clothes, ThredUp wins on convenience and price. Everything is quality-checked, photographed consistently, and priced by the company. No haggling required.
- For selling, Mercari takes the least from your pocket. A flat 10% fee beats Poshmark's 20% commission on sales over $15, and Mercari lets you sell basically anything.
- Poshmark is best if you enjoy the social side of resale and want to find specific designer or brand-name pieces through a community of fashion-focused sellers.
Three Platforms, Three Completely Different Models
These three apps are all in the “used clothes” business, but they work in fundamentally different ways. Understanding the model behind each one is the fastest way to figure out which one deserves your time and money.
Poshmark is a peer-to-peer social marketplace. You're buying directly from another person. Sellers set their own prices, take their own photos, and ship items themselves. Poshmark takes a 20% commission on sales of $15 or more (and a flat $2.95 on sales under $15). The platform was acquired by South Korean tech company Naver in 2023 for $1.2 billion, and it's leaned harder into social features since then. Think Instagram meets a consignment shop.
ThredUp runs a consignment model. Sellers ship their clothes to ThredUp in a prepaid bag, and ThredUp handles everything: photographing, listing, pricing, storing, and shipping. The seller gets a percentage of the sale price (which varies by item value and can be surprisingly low). Buyers get a more standardized shopping experience with consistent photos and condition descriptions.
Mercari is a general peer-to-peer marketplace (owned by a Japanese company of the same name). It started as a “sell anything” platform and still is. Clothes sit alongside electronics, toys, home goods, and pretty much everything else. Mercari charges sellers a flat 10% commission on every sale. It's the most straightforward of the three.
Buying: Which Platform Gets You Better Deals?
Price Comparison
ThredUp consistently has the lowest prices for everyday brands. A Gap denim jacket might run $15-$20 on ThredUp, while the same item on Poshmark could be listed at $35-$45 (though you can offer less). Mercari usually falls somewhere in between.
But for designer and premium brands, Poshmark often wins. Its fashion-focused community means more luxury inventory, more knowledgeable sellers, and more competitive pricing on brands like Tory Burch, Lululemon, and Free People. Poshmark sellers know the market value of these pieces and price accordingly, while the occasional Mercari seller underprices designer items because they don't specialize in fashion.
Shipping Costs
This is where the differences add up fast:
- Poshmark: Flat $7.67 shipping on all orders (up to 5 lbs), paid by the buyer
- ThredUp: $5.99 standard shipping, free shipping on orders over $79. They also run frequent free shipping promos.
- Mercari: Variable. Sellers choose the shipping method and can offer free shipping or pass the cost to buyers. USPS rates through Mercari range from $4.99 to $16.50+ depending on weight.
For single items under $30, ThredUp's $5.99 shipping is cheapest. Poshmark's flat rate becomes a better deal when you're buying heavier items (coats, boots, bundles). Mercari is a wildcard because it depends entirely on what the seller chose.
Selection and Quality
Poshmark has the strongest selection for fashion specifically. Its user base skews toward fashion-conscious sellers who know brands and present items well. You'll find curated closets organized by style, season, and brand. The downside: quality varies because there's no middleman inspecting items.
ThredUp inspects every item before listing it and assigns a condition rating (New With Tags, Like New, Gently Used, Good). About 40% of items sent in get rejected for quality issues. So what you see on the site has been filtered. The downside: their descriptions can still miss flaws, and you can't ask the “seller” questions because there is no seller. It's just ThredUp.
Mercari has the widest range of categories but the thinnest fashion selection. Because it's a general marketplace, fashion-specific inventory is scattered. You can find hidden gems, but you'll wade through more irrelevant listings to find them.
Buyer Protection
- Poshmark: Payment held in escrow for three days after delivery. You can file a case if the item doesn't match the listing. Items over $500 get authenticated through Posh Verify. Strong protection, but the three-day window is strict.
- ThredUp: 14-day return window for store credit (or refund to original payment if the item was damaged or not as described). More generous timeline than Poshmark, but store credit isn't as useful as a real refund.
- Mercari: Three-day inspection window (same as Poshmark). Mercari holds payment until you rate the seller. Their dispute process is reasonable but not as fashion-specific as Poshmark's.
Winner for buyers: ThredUp. The 14-day return window, consistent condition ratings, and lower prices make it the safest and most affordable option for casual shopping. Poshmark is better for designer pieces and specific brand searches. Mercari is the best option if you're buying clothes alongside non-fashion items.
Selling: Where You'll Actually Make Money
The Fee Breakdown
Let's say you sell a pair of jeans for $50 on each platform. Here's what you keep:
- Poshmark: 20% commission = $10 fee. You keep $40.
- Mercari: 10% commission = $5 fee. You keep $45.
- ThredUp: It depends on the payout structure, but for a $50 item, you might see $15-$20 (ThredUp sets the price and takes 60-80% of the sale). You keep roughly $15.
The math isn't even close. Mercari gives you the most money per sale. Poshmark takes a big cut but still pays you significantly more than ThredUp. And ThredUp's payout structure is, frankly, brutal for sellers. You're giving up control of pricing and keeping pennies on the dollar for everyday items.
Effort Required
ThredUp requires the least effort. You stuff clothes in a bag, ship it (for free with their Clean Out Kit), and wait. They handle everything. But “everything” includes pricing your $80 dress at $22 and giving you $7 for it. Convenience has a steep price.
Poshmark demands the most ongoing effort. You photograph items, write descriptions, price them, respond to comments, share your listings (critical for visibility), negotiate offers, and ship within two to three days. The social aspect means you're expected to “share” other sellers' listings and engage with the community to get your own items seen. It's practically a part-time job if you're selling regularly.
Mercari is the middle ground. List it, ship it when it sells. No social features to maintain, no community obligations. You just need decent photos and a fair price.
Shipping for Sellers
- Poshmark: Provides a prepaid USPS Priority Mail label for every sale. Shipping is always paid by the buyer ($7.67). The seller just needs a box or poly mailer. Simple.
- Mercari: Offers prepaid labels through USPS, UPS, and FedEx. Sellers can choose to cover shipping (to attract buyers) or pass it to the buyer. More flexible, but also more decisions to make.
- ThredUp: You ship your items to ThredUp once. They handle all outgoing shipping to buyers. Easiest for sellers by far.
What Sells Best Where
Poshmark is the best platform for selling premium fashion brands. Lululemon, Nike, Free People, Anthropologie, designer handbags. The audience is there specifically for fashion, and they're willing to pay more for well-presented items. If you have a closet full of quality brands, Poshmark is your place.
Mercari works better for mid-range and budget brands, plus anything that isn't clothing. Selling a pair of Old Navy jeans alongside a used Instant Pot? Mercari's your spot. The lower 10% fee means even inexpensive items are worth listing.
ThredUp is best for people who want to clean out their closet and don't care about maximizing profit. If you'd otherwise donate the clothes, ThredUp at least puts a few dollars in your pocket.
Winner for sellers: Mercari for most people. The 10% fee is hard to argue with, the audience is large, and the effort-to-payout ratio is the best of the three. Poshmark is the better choice specifically for higher-end fashion if you're willing to put in the social hustle.
The User Experience Gap
These three platforms feel very different to use, and that matters if you're going to spend time on them regularly.
Poshmark feels like a social media app that happens to sell clothes. There's a feed, there are followers, there are “Posh Parties” (live shopping events). It's engaging if you enjoy the fashion community aspect, but exhausting if you just want to buy a shirt and move on. The app is feature-heavy and can feel cluttered.
ThredUp feels the most like a traditional online store. You browse, filter, add to cart, check out. No social features, no negotiations, no messaging sellers. It's clean and efficient. But the tradeoff is less inventory control and no way to ask questions about specific items.
Mercari is the most no-frills of the three. The interface is simple, listings are straightforward, and the buying process is quick. It doesn't try to be anything other than a marketplace. Some people find it boring. Others find it refreshing.
Quick Comparison Cheat Sheet
Seller Fees: Mercari 10% / Poshmark 20% (sales over $15) / ThredUp 60-80% (they keep most of it)
Shipping Cost (Buyer): Poshmark $7.67 flat / ThredUp $5.99 (free over $79) / Mercari varies ($4.99-$16.50+)
Return Window: ThredUp 14 days / Poshmark 3 days / Mercari 3 days
Authentication: Poshmark (Posh Verify, $500+) / ThredUp (in-house inspection) / Mercari (Mercari Authenticate, $200+)
Best For Buying: ThredUp (everyday brands, casual shopping) / Poshmark (designer, specific brands) / Mercari (variety, non-fashion items too)
Best For Selling: Mercari (lowest fees, general items) / Poshmark (premium fashion, engaged audience) / ThredUp (zero effort, lowest payout)
The bottom line
There's no single winner here because these platforms serve different purposes. But if you forced me to pick one for each use case, here's how it shakes out: ThredUp for casual buying (lower prices, less hassle, longer return window), Poshmark for designer buying (best luxury selection, authentication for expensive items), and Mercari for selling (10% fee, minimal effort, broad audience).
Most regular resale shoppers end up using at least two of these platforms. And honestly, that's the smart play. List expensive fashion on Poshmark, sell everyday stuff on Mercari, and browse ThredUp when you want a quick retail-like shopping experience. Each platform does one thing well.
Pick the platform that matches your specific need, not the one with the best marketing. Your wallet (and your time) will thank you.
