Best European Square Alternatives (2026)

SumUp

🇬🇧

by SumUp Limited

SumUp is a European mobile payment processing company headquartered in London, UK (founded 2012). It enables small businesses to accept card payments via portable card readers and a smartphone app. SumUp operates across 36 markets in Europe, the Americas, and globally. The platform includes card readers, mobile POS, online payments, invoicing, and a business account — all with no monthly fees on the standard plan. Merchants pay only per transaction (1.69% for in-person payments in Europe).

Flatpay

🇩🇰

by Flatpay

Flatpay provides businesses with streamlined payment solutions and a powerful point of sale system, allowing merchants to easily accept payments anytime, anywhere, with no hidden fees.

Mollie

🇳🇱

by Mollie B.V.

Mollie is a payment service provider that facilitates online transactions for businesses. It supports various payment methods, including credit cards and digital wallets, to help streamline the checkout process. The platform offers easy integration with websites and provides tools for managing payments and analytics.

GoCardless

🇬🇧

by GoCardless Ltd

GoCardless is a payment processing platform that enables businesses to collect recurring payments directly from customers' bank accounts via Direct Debit. It simplifies the billing process, reduces transaction fees, and offers secure payment collection. Ideal for subscription services and invoice-based businesses.

Adyen

🇳🇱

by Adyen N.V.

Dutch payment platform providing end-to-end infrastructure for accepting payments anywhere in the world.