OpenCart offers Free Trial, but Authorize.Net does not.
OpenCart is designed for Freelancers, Medium Business and Small Business.
Authorize.Net is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Authorize.Net begins at $25/Month, while pricing details for OpenCart are unavailable.
Some top alternatives to OpenCart includes and undefined.
Some top alternatives to Authorize.Net includes Stripe Payments, QuickBooks Payments, PayorCRM, UniPay Gateway, NETELLER, NextPay Payment Gateway, Airpay, Better Payment, aPay Payment Gateway Systems and PayNet.