Stripe is an internationally focused payment service provider that supports more than 135 currencies and a wide range of payment methods such as credit/debit cards, Apple Pay, and Google Pay. Mollie, on the other hand, has a stronger focus on the European market and offers dedicated European payment methods such as iDEAL or Sofort. Stripe also offers extensive developer tools and a customizable API for complex payment processing. Mollie is known for its user-friendly interfaces and quick setup, making it ideal for smaller businesses or startups.