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E-Commerce · head to head

OpenCart vs Square for Retail

OpenCart logo

OpenCart

E-Commerce

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

From
Free
Rated
-
Full reviewWebsite
Square for Retail logo

Square for Retail

E-Commerce

Integrated point of sale and retail management

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.; Square for Retail limited customer support with primarily email and online forums, slow response times for urgent issues
  • They diverge on capability: OpenCart covers MIT licensed source, Square for Retail covers Contactless payments.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which OpenCart and Square for Retail actually diverge.

Attributes where OpenCart and Square for Retail differ
AttributeOpenCartSquare for Retail
Pricing modelopen-sourceUnknown
PlatformsWebiOS, API

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (E-Commerce), founded (2009).

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 Square for Retail

  • Contactless payments
  • Inventory tracking
  • Employee management
  • Customer profiles
  • Sales analytics
  • Receipt printing
  • Integration with Square Online
  • Reporting 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 Square for Retail
  • An agency building client stores where the client must own the code and the data outrightnot Square for Retail
  • A store with unusual catalogue or pricing logic that a hosted platform will not permitnot Square for Retail
  • Selling in a market where the local payment gateway is not supported by the mainstream SaaS platformsnot Square for Retail

Square for Retail

  • Retail point-of-sale systemsnot OpenCart
  • Online store payment processingnot OpenCart
  • Appointment and booking schedulingnot OpenCart
  • Phone and field payment collectionnot 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.

Square for Retail

  • Limited customer support with primarily email and online forums, slow response times for urgent issues
  • Internet connectivity required for normal operations; weak signal impacts transaction processing and experience
  • Restricted to Square's payment processing with higher transaction fees compared to some competitors
  • Limited to iOS devices and Square's proprietary hardware, excluding Android or third-party devices
  • Limited advanced retail capabilities and deeper third-party integrations compared to enterprise POS systems

Pricing, plan by plan

OpenCart

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

Square for Retail

Free
  • FreeFree
    • Payment processing at 2.6% + 15 cents
    • Basic inventory management
    • Invoicing
  • Plus$49/month
    • In-person: 2.5% + 15 cents
    • Online: 2.9% + 30 cents
    • Product exchanges
  • Premium$149/month
    • In-person: 2.4% + 15 cents
    • Online: 2.9% + 30 cents
    • Advanced features

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 Square for Retail if

  • You need contactless payments.
  • You want to start without paying.
  • You work on iOS, API.
  • You also want inventory tracking.
Square for Retail review

Questions people ask

Is OpenCart or Square for Retail better?
Neither clearly leads. OpenCart starts at Free and Square for Retail at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, OpenCart or Square for Retail?
OpenCart starts at Free and Square for Retail at Free.
Does OpenCart or Square for Retail run on more platforms?
OpenCart runs on Web. Square for Retail runs on iOS, API.
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 Square for Retail is typically brought in for.
What can OpenCart do that Square for Retail cannot?
OpenCart covers MIT licensed source, Self-hosted PHP and MySQL, No transaction fees, Multi-store. Square for Retail covers Contactless payments, Inventory tracking, Employee management, Customer profiles.

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.

Square for Retail: Does Square for Retail have a free tier?

Yes, Square for Retail's free tier includes payment processing at 2.6% plus 15 cents per transaction, basic inventory, invoicing, online shop, and booking tools with no monthly subscription fee.

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.

Square for Retail: What are the transaction fees across Square's pricing tiers?

Free tier: 2.6% + 15 cents. Plus tier ($49/month): 2.5% + 15 cents in-person, 2.9% + 30 cents online. Premium tier ($149/month): 2.4% + 15 cents in-person, 2.9% + 30 cents online.

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.

Square for Retail: What devices can run Square for Retail?

Square for Retail runs on iOS devices (iPad and iPhone) using Square's proprietary hardware or compatible mobile devices, and requires integration with Square's payment processing.

Source
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.

Square for Retail: Can I use Square for Retail offline?

Square for Retail depends on an internet connection for optimal functionality. Offline functionality is limited, and high-traffic operations may require recharging or connection verification.

Source
Square for Retail: Does Square for Retail support third-party integrations?

Yes, Square offers integrations through its App Marketplace and provides APIs for custom development including payments, inventory, orders, customers, loyalty, and webhooks.

Source
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