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E-Commerce · head to head

Mollie vs Square

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 logo

Square

E-Commerce

Powering the economy

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Square 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 plus plan pricing not specified in documentation
  • They diverge on capability: Mollie covers Local payment methods, Square covers Payment processing.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Mollie and Square actually diverge.

Attributes where Mollie and Square differ
AttributeMollieSquare
Starting price£0.3/transactionFree
Pricing modelPer transaction by payment methodfreemium
Free tierNoYes
PlatformsWeb, iOS, Android, APIPOS (Mobile app), Web
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

  • Payment processing
  • Point of sale
  • Invoicing
  • Payroll
  • Banking
  • QuickBooks
  • WooCommerce
  • Wix

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
  • A small merchant that wants published pricing rather than a sales call before it can model card costsnot Square
  • A subscription business in the EEA collecting by SEPA Direct Debit mandate instead of cardnot Square
  • A marketplace or platform that needs one integration covering the main European local methodsnot Square

Square

  • Accept payments with all-in-one POS applicationnot Mollie
  • Online ordering and basic website creationnot Mollie
  • Invoicing and appointment bookingnot Mollie
  • Staff scheduling and loyalty programmesnot 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

  • Plus plan pricing not specified in documentation
  • Processing fees differ by tier but exact rates not detailed
  • Free plan pricing mentioned but specific features for Plus unclear
  • Text marketing charged at 3¢ per message after first 500 included

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

Free
  • FreeFree
    • Accept payments with all-in-one POS app
    • Online site builder (ordering profiles, basic websites, online stores, booking sites)
    • Item library and inventory tracking
  • Plus$null/mo
    • All Free plan features
    • Advanced POS features for food, retail, and appointments
    • Lower processing fees on card transactions

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 if

  • You need payment processing.
  • You want to start without paying.
  • You work on POS (Mobile app), Web.
  • You also want point of sale.
Square review

Questions people ask

Is Mollie or Square better?
Neither clearly leads. Mollie starts at £0.3/transaction and Square at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Mollie or Square?
Square has a free tier; the other does not. Paid plans start at £0.3/transaction for Mollie and Free for Square.
Does Mollie or Square run on more platforms?
Mollie runs on Web, iOS, Android, API. Square runs on POS (Mobile app), Web.
Can I use Square for free?
Yes. Square 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 is typically brought in for.
What can Mollie do that Square cannot?
Mollie covers Local payment methods, Published rate card, Hosted checkout and payment links, Subscriptions API. Square covers Payment processing, Point of sale, Invoicing, Payroll.

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: Does Square offer a free plan?

Yes, Square's free plan includes an all-in-one POS app, online site builder, item library and inventory tracking, invoicing, appointment scheduling, staff calendars, and checking and savings account access. No subscription fees are charged.

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: What does Square Plus add compared to the free plan?

Square Plus adds advanced POS features for food and retail, lower processing fees on card transactions, custom loyalty programs, unlimited email marketing campaigns, text messaging, and staff scheduling and attendance tracking.

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.

Mollie: Does Mollie do interchange plus?

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

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