Calendly's paid plans are listed at US$10 per seat per month (Standard) and US$16 per seat per month (Teams), with a free plan. They include round-robin team scheduling, payments through Stripe and PayPal, automated reminders, routing forms and invoicing.
ModusOp Bookings is priced per business rather than per seat — see our pricing page — and lives alongside projects, invoicing with Xero sync, and Modus Respond, which can answer your phone with an AI voice receptionist from the Respond Professional plan.