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E-Commerce · head to head

Mollie vs Square for Retail

Mollie logo

Mollie

E-Commerce

European payment service provider with published per-transaction rates and no monthly fee on the online plan

From
£0.3/transaction
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

  • Only Square for Retail has a free tier, so it costs nothing to try first.
  • Each has a real cost: Mollie non-European cards cost 3.25% plus 20p against 1.20% plus 20p for UK domestic consumer cards, so a merchant with significant traffic from the US or Asia pays close to triple the domestic rate on that revenue.; Square for Retail limited customer support with primarily email and online forums, slow response times for urgent issues
  • They diverge on capability: Mollie covers Local payment methods, Square for Retail covers Contactless payments.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

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

Attributes where Mollie and Square for Retail differ
AttributeMollieSquare for Retail
Starting price£0.3/transactionFree
Pricing modelPer transaction by payment methodUnknown
Free tierNoYes
PlatformsWeb, iOS, Android, APIiOS, API
FoundedUnknown2009

Identical on both: 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 Mollie

  • Local payment methods
  • Published rate card
  • Hosted checkout and payment links
  • Subscriptions API
  • Point of sale terminals
  • Plugin ecosystem
  • Multicurrency settlement

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.

Mollie

  • A Dutch or Belgian shop where most customers pay by iDEAL or Bancontact and the flat 30p beats a percentage rate on high-value basketsnot Square for Retail
  • A small merchant that wants published pricing rather than a sales call before it can model card costsnot Square for Retail
  • A subscription business in the EEA collecting by SEPA Direct Debit mandate instead of cardnot Square for Retail
  • A marketplace or platform that needs one integration covering the main European local methodsnot Square for Retail

Square for Retail

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

Where each one falls short

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

Mollie

  • Non-European cards cost 3.25% plus 20p against 1.20% plus 20p for UK domestic consumer cards, so a merchant with significant traffic from the US or Asia pays close to triple the domestic rate on that revenue.
  • Coverage is built around European methods, so if you expand into Latin America or Southeast Asia you will need a second processor and a second reconciliation process rather than extending Mollie.
  • The in-person Pro plan requires a one-year contract and charges 20 pounds a month per additional terminal, so a shop with four tills pays 80 pounds a month in terminal fees before any transaction cost.
  • Mollie offers no interchange-plus option publicly, so large merchants cannot see or benefit from falling interchange the way they could on a cost-plus contract with an acquirer.
  • The developer tooling and reporting are lighter than the largest processors, so finance teams that want detailed fee breakdowns or granular reconciliation exports often end up building that layer themselves.

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

Mollie

£0.3/transaction
  • Online paymentsFree
    • No monthly fee
    • UK domestic consumer cards 1.20% + 20p
    • European and commercial cards 2.90% + 20p
  • In person, pay as you goFree
    • No monthly commitment
    • Per-transaction terminal rates
    • One terminal
  • In person, Pro$20/month
    • Lower per-transaction terminal rates
    • One-year contract required
    • Each additional terminal 20 pounds per month

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 Mollie if

  • You need local payment methods.
  • You work on Web, iOS, Android, API.
  • You also want published rate card.
Mollie 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 Mollie or Square for Retail better?
Neither clearly leads. Mollie starts at £0.3/transaction and Square for Retail at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Mollie or Square for Retail?
Square for Retail has a free tier; the other does not. Paid plans start at £0.3/transaction for Mollie and Free for Square for Retail.
Does Mollie or Square for Retail run on more platforms?
Mollie runs on Web, iOS, Android, API. Square for Retail runs on iOS, API.
Can I use Square for Retail for free?
Yes. Square for Retail has a free tier, so you can try it without paying. Mollie starts at £0.3/transaction.
What is Mollie best used for?
Mollie is most often used for a dutch or belgian shop where most customers pay by ideal or bancontact and the flat 30p beats a percentage rate on high-value baskets, a small merchant that wants published pricing rather than a sales call before it can model card costs, a subscription business in the eea collecting by sepa direct debit mandate instead of card, a marketplace or platform that needs one integration covering the main european local methods. Of those, a dutch or belgian shop where most customers pay by ideal or bancontact and the flat 30p beats a percentage rate on high-value baskets and a small merchant that wants published pricing rather than a sales call before it can model card costs are not what Square for Retail is typically brought in for.
What can Mollie do that Square for Retail cannot?
Mollie covers Local payment methods, Published rate card, Hosted checkout and payment links, Subscriptions API. Square for Retail covers Contactless payments, Inventory tracking, Employee management, Customer profiles.

Answered from the vendors’ own pages

Mollie: Does Mollie charge a monthly fee?

Not on the online payments plan. You pay only per successful transaction. In-person Pro is 20 pounds a month.

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
Mollie: Is iDEAL really a flat fee?

Yes, 30p per transaction regardless of the amount, which is why it is cheaper than cards on high-value baskets.

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
Mollie: Can I use Mollie outside Europe?

You can accept non-European cards but at 3.25% plus 20p, and merchant accounts are aimed at European businesses. It is not a global processor.

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
Mollie: Does Mollie do interchange plus?

Not publicly. The published rates are blended, so falling interchange does not flow through to you automatically.

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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