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E-Commerce · head to head

Mercari vs OpenCart

Mercari logo

Mercari

E-Commerce

Japan-founded peer-to-peer resale marketplace with a flat seller commission

From
Free
Rated
-
Full reviewWebsite
OpenCart logo

OpenCart

E-Commerce

Self-hosted open source shopping cart written in PHP, released under the MIT licence

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Mercari the flat 10 percent commission plus payment processing fees applies even to very low-value items, so selling something for a few dollars can leave the seller with proportionally little after fees and packaging.; OpenCart extensions modify core behaviour through an XML patching system, so two modules that patch the same file conflict in ways that surface as broken checkout rather than as an installation error, and resolving that requires a developer reading both patches.
  • They diverge on capability: Mercari covers Flat seller commission, OpenCart covers MIT licensed source.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Mercari and OpenCart actually diverge.

Attributes where Mercari and OpenCart differ
AttributeMercariOpenCart
Pricing modelFree to list; 10 percent seller commission on sale price plus payment processing feeopen-source
PlatformsiOS, Android, WebWeb
FoundedUnknown2009

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (E-Commerce).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Mercari

  • Flat seller commission
  • Prepaid shipping labels
  • Local pickup and offers
  • Smart pricing and price drops
  • Mercari authenticity guarantee
  • Instant or standard payout

Only in OpenCart

  • MIT licensed source
  • Self-hosted PHP and MySQL
  • No transaction fees
  • Multi-store
  • Extension marketplace
  • Multi-currency and multi-language
  • OCMod modification system
  • Full data access

What people use each for

The jobs each tool is most often brought in to do.

Mercari

  • Someone clearing out a wide mix of household items, not just clothing, in one listing appnot OpenCart
  • A casual seller who wants a flat, predictable commission rather than a tiered fee structurenot OpenCart
  • A buyer looking for secondhand electronics or general goods alongside apparelnot OpenCart
  • A seller using local pickup to avoid shipping costs on bulky itemsnot OpenCart

OpenCart

  • A merchant with volume high enough that a percentage transaction fee costs more than a developernot Mercari
  • An agency building client stores where the client must own the code and the data outrightnot Mercari
  • A store with unusual catalogue or pricing logic that a hosted platform will not permitnot Mercari
  • Selling in a market where the local payment gateway is not supported by the mainstream SaaS platformsnot Mercari

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Mercari

  • The flat 10 percent commission plus payment processing fees applies even to very low-value items, so selling something for a few dollars can leave the seller with proportionally little after fees and packaging.
  • Shipping is the seller's responsibility to arrange and package correctly, and disputes over item condition or damage in transit are common friction points in buyer-seller resolution.
  • Instant payout carries its own fee on top of the selling and processing fees already deducted, so getting money out quickly costs more than waiting for standard transfer.
  • Buyer protection and authenticity verification are limited outside the specific luxury authentication programme, so counterfeit risk on unverified categories rests largely on buyer judgement of listing photos and seller ratings.
  • Market depth and typical sale prices vary significantly between the Japan and US versions of the app, and the two operate as largely separate marketplaces despite the shared brand.

OpenCart

  • Extensions modify core behaviour through an XML patching system, so two modules that patch the same file conflict in ways that surface as broken checkout rather than as an installation error, and resolving that requires a developer reading both patches.
  • Major version upgrades have broken third party extension compatibility, so moving between them means re-purchasing or re-commissioning modules and effectively rebuilding parts of the store rather than clicking update.
  • Hosting, patching, backups and PCI scope are all your responsibility, so a security update you postpone is a breach you own, and there is no vendor obligation to notify or protect you.
  • Extension quality on the marketplace is uneven and modules are sold as one-off purchases with no guaranteed maintenance, so a module central to your store can simply stop being updated and leave you holding the code.
  • The core project is maintained by a very small team relative to the platforms it competes with, so security fixes, compatibility with new PHP versions and feature work all arrive at a pace you cannot influence or pay to accelerate.

Pricing, plan by plan

Mercari

Free
  • SellingFree
    • 10 percent selling fee on final sale price
    • Separate payment processing fee, roughly 2.9 percent plus a fixed amount
    • Instant payout carries an additional fee versus standard bank transfer

OpenCart

Free
  • Open SourceFree
    • Core ecommerce features
    • Free support
    • Extensions available

Which should you pick?

Choose Mercari if

  • You need flat seller commission.
  • You want to start without paying.
  • You work on iOS, Android, Web.
  • You also want prepaid shipping labels.
Mercari review

Choose OpenCart if

  • You need mit licensed source.
  • You want to start without paying.
  • You also want self-hosted php and mysql.
OpenCart review

Questions people ask

Is Mercari or OpenCart better?
Neither clearly leads. Mercari starts at Free and OpenCart at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Mercari or OpenCart?
Mercari starts at Free and OpenCart at Free.
Does Mercari or OpenCart run on more platforms?
Mercari runs on iOS, Android, Web. OpenCart runs on Web.
Can I use Mercari for free?
Both have a free tier, so you can try either at no cost before committing.
What is Mercari best used for?
Mercari is most often used for someone clearing out a wide mix of household items, not just clothing, in one listing app, a casual seller who wants a flat, predictable commission rather than a tiered fee structure, a buyer looking for secondhand electronics or general goods alongside apparel, a seller using local pickup to avoid shipping costs on bulky items. Of those, someone clearing out a wide mix of household items, not just clothing, in one listing app and a casual seller who wants a flat, predictable commission rather than a tiered fee structure are not what OpenCart is typically brought in for.
What can Mercari do that OpenCart cannot?
Mercari covers Flat seller commission, Prepaid shipping labels, Local pickup and offers, Smart pricing and price drops. OpenCart covers MIT licensed source, Self-hosted PHP and MySQL, No transaction fees, Multi-store.

Answered from the vendors’ own pages

Mercari: How much does Mercari charge sellers?

A flat 10 percent selling fee on the final sale price in the US, plus a separate payment processing fee, both deducted from the seller payout.

OpenCart: Is OpenCart really free?

The software is MIT licensed with no paid edition. The costs are hosting, extensions, and a developer, and for a low volume store those can exceed a SaaS subscription.

Mercari: Does the buyer pay any extra platform fee?

No separate platform fee is added at buyer checkout the way Vinted adds a buyer protection fee; the buyer pays the listed price plus shipping if not included.

OpenCart: Does it charge transaction fees?

No. There is no platform cut and no surcharge for using your own payment gateway, which is the main financial argument for self-hosting at volume.

Mercari: Is Mercari the same marketplace in Japan and the US?

No, they operate as separate marketplaces under the same brand, with different inventory, pricing and fee history.

OpenCart: How hard is customisation?

Theme changes are ordinary PHP templates and are approachable. Changing behaviour means the OCMod patching system, which conflicts between extensions and needs a developer.

OpenCart: What is the biggest hidden cost?

Upgrades. Version transitions have broken extension compatibility before, so budget for a partial rebuild rather than assuming updates are routine maintenance.

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