Prompt Zero is an AI Visibility Intelligence platform that monitors how brands appear across 6 AI models. Marketing teams use it to track brand mentions, ranking position, citations, and sentiment in AI-generated responses. Key features: AI Visibility Score (0-100 composite), multi-model scanning (ChatGPT, Gemini, Grok, Perplexity, DeepSeek, Llama), competitive analysis with share of voice, Brand Facts threat detection (alerts when AI contradicts your brand info), citation tracking, sentiment analysis, and actionable recommendations. Pricing starts at $29/mo (Starter) with a 7-day free trial requiring no credit card. Built for SaaS founders, marketers, and agencies who want to understand and improve how AI recommends their products.