Cardinity is described as '- online card payment processing provider offers the friendliest price in the market and is compatible with all leading e-commerce and CMS systems. Proffesional assistance and smooth integration guaranteed!' and is an app in the Business & Commerce category. There are more than 50 alternatives to Cardinity for a variety of platforms, including Online / Web-based, Android, iPhone, Mac and Windows. The best alternative is PayPal. It's not free, so if you're looking for a free alternative, you could try Litecoin or Taler. Other great apps like Cardinity are Flattr (Paid), Stripe (Paid), Payoneer (Paid) and DASH (Free, Open Source).
Flattr is a social micropayment service, that makes it easy for you to "flatter" things on the internet that you like. When you're registered to Flattr, you pay a small monthly fee of your own choosing.
Stripe helps you create any type of payments flow—from e-commerce to recurring billing and everything in between.
Stripe enables you to accept payments in minutes.
Stripe makes recurring and subscription-based billing easy.
GNU Taler is a privacy-preserving payment system. Customers can stay anonymous, but merchants can not hide their income through payments with GNU Taler. This helps to avoid tax evasion and money laundering.