When I signed up for Prohub in April of 2022, the company appeared to do its formatting without any standard publishing app, which led to numerous errors. After many months of back-and-forth emails and about six requests for a refund, I finally received a full refund. Since then, they may have purchased a standard publishing app for their books. I would suggest that anyone interested in using Prohub contact them to find out specifically what formatting app they plan to use.