REX is offered by subscription and is priced on a per-user per-month basis. With that said there are 2 pricing plans. 1) Pay as You Grow which $50 per month (for the 1st user) plus $3 for every appointment seen. There is no charge to make an appointment and there is no charge if an appointment is canceled. Option 2) REX Unlimited is $175 per month (for 1st user) an an unlimited number of appointments can be seen. Additional users may be added for a flat $25 per month per user.