An AI roleplay coach is an AI that runs structured practice sessions for high-stakes conversations — sales calls, salary negotiations, job interviews, customer complaint handling — using realistic AI characters with distinct personalities, then scores each session on detailed rubrics and gives specific coaching to improve. Marcus is designed for teams that need to build communication skills at volume without booking a human coach for every session: practice happens on demand, scoring is immediate, and the improvement path is specific rather than generic.

Yes, and the mechanism is clear: sales skills improve through repetition with feedback, and human-facilitated practice is expensive and scarce. Marcus runs unlimited scenarios — a different prospect personality, a harder objection, a procurement call rather than a discovery call — and scores each one on the same rubric (anchoring, objection handling, active listening, silence tolerance, clarity). Reps who practice 10 sessions before a real conversation are measurably better prepared than those who practice none.

Marcus uses voice (via ElevenLabs or Claude Voice) to run the practice conversation with a realistic AI character — a skeptical procurement lead, an enthusiastic but non-decision-making champion, an angry customer looking for a refund. The AI character responds dynamically to what the user says, holds a consistent persona, and escalates or softens based on how the conversation goes. At the end, Marcus scores the user across 5 dimensions, surfaces 3 specific coaching points, and assigns a drill for next time.

Second Nature and Rehearsal.io are dedicated sales roleplay tools with good library management but limited scoring depth. Gong Engage has conversation practice features but is primarily a revenue intelligence tool. Modjo focuses on coaching from real calls, not practice scenarios. Marcus is distinct for teams that want voice-based roleplay across multiple scenarios (sales, interviews, negotiations, customer complaints) with scored rubrics and coaching — not just replaying real calls or doing text-based practice.