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E-Commerce · head to head

OpenCart vs Swell Commerce

OpenCart logo

OpenCart

E-Commerce

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

From
Free
Rated
-
Full reviewWebsite
Swell Commerce logo

Swell Commerce

E-Commerce

Headless ecommerce for modern brands

From
$29/month
Rated
-
Full reviewWebsite

The short version

  • Only OpenCart has a free tier, so it costs nothing to try first.
  • 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.; Swell Commerce each plan carries an annual revenue ceiling, and exceeding it is charged as a percentage of the excess: 2 percent on Starter down to 0.4 percent on Unlimited
  • They diverge on capability: OpenCart covers MIT licensed source, Swell Commerce covers Headless architecture.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which OpenCart and Swell Commerce actually diverge.

Attributes where OpenCart and Swell Commerce differ
AttributeOpenCartSwell Commerce
Starting priceFree$29/month
Pricing modelopen-sourcesubscription
Free tierYesNo
Founded20092019

Identical on both: platforms (Web), 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 Swell Commerce

  • Headless architecture
  • GraphQL & REST APIs
  • Subscription commerce
  • Multi-currency support
  • Inventory management
  • Custom checkout
  • Webhook integrations
  • Developer-friendly SDK

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 Swell Commerce
  • An agency building client stores where the client must own the code and the data outrightnot Swell Commerce
  • A store with unusual catalogue or pricing logic that a hosted platform will not permitnot Swell Commerce
  • Selling in a market where the local payment gateway is not supported by the mainstream SaaS platformsnot Swell Commerce

Swell Commerce

  • Running a headless commerce backend with APIs for a custom storefrontnot OpenCart
  • Selling subscription products alongside one off purchasesnot OpenCart
  • Operating multi currency stores from one commerce backendnot 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.

Swell Commerce

  • Each plan carries an annual revenue ceiling, and exceeding it is charged as a percentage of the excess: 2 percent on Starter down to 0.4 percent on Unlimited
  • Starter at $29 a month allows 2 admin users and includes only 100,000 API requests and 1GB of storage per month
  • Additional API requests cost $5 per 100,000 and extra storage $5 per GB
  • Role based permissions and developer support are restricted to the Unlimited plan at $2,250 a month
  • Advanced reports and priced currencies require the Standard plan or higher
  • Published prices are the billed yearly rates, so monthly billing costs more

Pricing, plan by plan

OpenCart

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

Swell Commerce

$29/month
  • Starter$29/month
    • Up to $50K annual revenue
    • Basic reports
    • Up to 5 admin users
  • Basic$79/month
    • Up to $250K annual revenue
    • Most popular plan
    • Basic reports
  • Standard$299/month
    • Up to $1M annual revenue
    • Advanced reports
    • Up to 15 admin users
  • Unlimited$2250/month
    • Up to $5M annual revenue
    • Unlimited scalability and granular control
    • Unlimited admin users

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 Swell Commerce if

  • You need headless architecture.
  • You also want graphql & rest apis.
Swell Commerce review

Questions people ask

Is OpenCart or Swell Commerce better?
Neither clearly leads. OpenCart starts at Free and Swell Commerce at $29/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, OpenCart or Swell Commerce?
OpenCart has a free tier; the other does not. Paid plans start at Free for OpenCart and $29/month for Swell Commerce.
Does OpenCart or Swell Commerce run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use OpenCart for free?
Yes. OpenCart has a free tier, so you can try it without paying. Swell Commerce starts at $29/month.
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 Swell Commerce is typically brought in for.
What can OpenCart do that Swell Commerce cannot?
OpenCart covers MIT licensed source, Self-hosted PHP and MySQL, No transaction fees, Multi-store. Swell Commerce covers Headless architecture, GraphQL & REST APIs, Subscription commerce, Multi-currency support.

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.

Swell Commerce: How much does Swell Commerce cost?

Swell offers four tiers starting at $29 per month for Starter and going up to $2,250 per month for Unlimited. Annual billing provides a 25% discount compared to monthly billing. All prices are in USD.

Source
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.

Swell Commerce: What are Swell's revenue tier overages?

Each plan includes a revenue ceiling based on 12-month trailing sales. Starter allows up to $50K with 2% overage, Basic allows $250K with 1.5% overage, Standard allows $1M with 1% overage, and Unlimited allows $5M with 0.4% overage. Custom plans are available for merchants exceeding $10M annually.

Source
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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