There are a few good choices out there for web accessibility. You can have it managed, which is is resource-heavy and costly. We opted for the plugin tools because it helps to keep cost down. 

We found the two best options to be Accessibe and UserWay. Both are priced the same at $490/year or $49/month. Accessible provides 100% compliance and a certificate. UserWay only provides 90% compliance. To get 100% compliance and certificate you have to upgrade to their managed plan. The choice is clear – Accessibe is the best tool to get your site compliant.