Payment.Ninja offers Free Trial, but Cardknox does not.
Payment.Ninja is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Cardknox is designed for Freelancers, Medium Business and Small Business.
The starting price of Payment.Ninja begins at $29/Month, while pricing details for Cardknox are unavailable.
Some top alternatives to Payment.Ninja includes PayPal Here, Braintree Direct, MagicPay, PayAnywhere, Invoice Ninja, Paymill, Cardknox, SwipeSimple and ScanPay.
Some top alternatives to Cardknox includes Stripe Payments, PaymentSpring, Authorize.Net, EBS, Stripe Connect, UniPay Gateway, EBizCharge, Airpay, Better Payment and aPay Payment Gateway Systems.