Calculus AI is an artificial intelligence tool specifically designed for use within the Vtiger CRM platform. It is designed to facilitate various crucial processes in customer relationship management, serving as a key component in various interfaces. Integrated within both the Sales Automation and Analytics & Intelligence arms of the platform, Calculus AI plays a significant role in enabling data-driven decision making and automating sales processes. The tool also appears in the list of AI offerings by Vtiger, alongside tools such as Chatbot, Prompt Builder, and Bot Management, indicating a focus on providing AI-driven solutions for improving business efficiency and customer relationships. The tool is part of an all-in-one CRM platform, designed to market, sell, and support various business functions. Vtiger provides options to integrate with 500+ apps working in sync with Calculus AI. However, the exact functionality and role of Calculus AI within the Vtiger ecosystem are not fully described in the provided text.