Aetna recently moved from Navinet to Availity. So, I can compare. From the provider's point of view Navinet is a much more advanced portal compared to Availity. Of all the portals that medical providers use Availity is the worst, the most bulky, the most uncomfortable. All operations, such as checking patient's legibility, claim submission, ckeckig a claim status it takes 3 times faster and easier in Navinet than through Availity. The first huge inconvenience is that the information of repeated patients is not stored in the Avility system. There is no way to go back to the submitted claims and etc. User's recommendation: stay away from Availity.