Asking for a raise, declining extra hours, or setting a boundary with a friend can all be rehearsed first in SocialCoach, an AI coach built for the conversations people dread. Pick one of 63 scenarios across seven areas of life, or describe your own situation, and talk to a character who has real goals, doubts, and limits, so politeness alone does not win the argument. A stance meter shows how firmly the other person holds their position as you speak, and optional timed replies add pressure for readiness practice. The debrief quotes what you actually said before judging it, separates communication quality from the outcome, and suggests one thing to change on the next attempt. A Today page recommends a daily scene from your goals, Growth tracks practice history against five competencies, and a Learn library offers short videos, theories, and cases with sources. Step into 3D dinners, elevator lobbies, and offices to answer by typing or speaking. Practice history stays in the browser and can be exported, with no sign-up needed, and the mobile-first layout installs as an app on a phone. Settings accept your own Anthropic or OpenAI-compatible model, or a server key, so a self-hosted copy runs on any gateway. English and Simplified Chinese are both built in. Rehearse a hard conversation three times here and the real one feels smaller. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. Apache-2.0 licensed.