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E-Commerce · head to head

OpenCart vs Poshmark

OpenCart logo

OpenCart

E-Commerce

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

From
Free
Rated
-
Full reviewWebsite
Poshmark logo

Poshmark

E-Commerce

Social resale marketplace with a flat fee on low-value sales and a percentage cut above that

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: 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.; Poshmark the flat 2.95 dollar fee on sales under 15 dollars takes a large proportional bite out of cheap items, making Poshmark a poor fit for offloading low-value pieces compared with a flat percentage competitor.
  • They diverge on capability: OpenCart covers MIT licensed source, Poshmark covers Social sharing feed.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which OpenCart and Poshmark actually diverge.

Attributes where OpenCart and Poshmark differ
AttributeOpenCartPoshmark
Pricing modelopen-sourceFree to list; tiered seller commission by sale price
PlatformsWebiOS, Android, Web
Founded2009Unknown

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 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

Only in Poshmark

  • Social sharing feed
  • Posh Shows live selling
  • Tiered seller commission
  • Prepaid shipping labels
  • Posh Protect buyer guarantee
  • Bundle and offer tools

What people use each for

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

OpenCart

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

Poshmark

  • A seller with a wardrobe of mid-value branded clothing who wants social discovery features to drive salesnot OpenCart
  • Someone willing to invest time sharing and engaging to keep listings visible in the feed algorithmnot OpenCart
  • A buyer who enjoys live-hosted Posh Shows as a shopping format rather than static browsingnot OpenCart
  • A seller who wants shipping cost handled through a fixed-rate prepaid label rather than arranging it themselvesnot OpenCart

Where each one falls short

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

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.

Poshmark

  • The flat 2.95 dollar fee on sales under 15 dollars takes a large proportional bite out of cheap items, making Poshmark a poor fit for offloading low-value pieces compared with a flat percentage competitor.
  • The 20 percent commission on higher-value sales is above Mercari flat 10 percent rate, so a seller moving pricier items pays materially more per sale unless the social discovery features generate enough extra volume to compensate.
  • Visibility in the app depends heavily on active sharing and engagement, so a seller who lists items and does not regularly promote them tends to see far fewer sales than one who does, turning selling into ongoing work.
  • Naver ownership since 2023 means Poshmark now reports as part of a larger Korean internet conglomerate rather than as an independent company, which can affect roadmap priorities and regional focus.
  • Buyer protection through Posh Protect requires timely reporting and photo evidence, and disputes over item condition still rely on subjective judgement between buyer and seller.

Pricing, plan by plan

OpenCart

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

Poshmark

Free
  • SellingFree
    • Flat 2.95 dollar fee on sales under 15 dollars
    • 20 percent commission on sales of 15 dollars or more
    • Shipping label cost typically passed to the buyer at a fixed rate

Which should you pick?

Choose OpenCart if

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

Choose Poshmark if

  • You need social sharing feed.
  • You want to start without paying.
  • You work on iOS, Android, Web.
  • You also want posh shows live selling.
Poshmark review

Questions people ask

Is OpenCart or Poshmark better?
Neither clearly leads. OpenCart starts at Free and Poshmark at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, OpenCart or Poshmark?
OpenCart starts at Free and Poshmark at Free.
Does OpenCart or Poshmark run on more platforms?
OpenCart runs on Web. Poshmark runs on iOS, Android, Web.
Can I use OpenCart for free?
Both have a free tier, so you can try either at no cost before committing.
What is OpenCart best used for?
OpenCart is most often used for a merchant with volume high enough that a percentage transaction fee costs more than a developer, an agency building client stores where the client must own the code and the data outright, a store with unusual catalogue or pricing logic that a hosted platform will not permit, selling in a market where the local payment gateway is not supported by the mainstream saas platforms. Of those, a merchant with volume high enough that a percentage transaction fee costs more than a developer and an agency building client stores where the client must own the code and the data outright are not what Poshmark is typically brought in for.
What can OpenCart do that Poshmark cannot?
OpenCart covers MIT licensed source, Self-hosted PHP and MySQL, No transaction fees, Multi-store. Poshmark covers Social sharing feed, Posh Shows live selling, Tiered seller commission, Prepaid shipping labels.

Answered from the vendors’ own pages

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.

Poshmark: How much does Poshmark charge sellers?

A flat 2.95 dollar fee on sales under 15 dollars, and a 20 percent commission on sales of 15 dollars or more.

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.

Poshmark: Who owns Poshmark?

Naver, the South Korean internet and search company, acquired Poshmark in 2023.

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.

Poshmark: Do I have to actively promote my listings?

Not strictly, but the app visibility algorithm favours accounts that regularly share and engage, so passive listing tends to sell more slowly.

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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