The document compares the costs and implementation of single tenant vs multi-tenant software architectures. Single tenant models require separate environments for each customer, increasing costs as the customer base grows, while multi-tenant models use shared infrastructure and resources to efficiently support multiple customers on a single environment. It then provides a calculator tool to help companies estimate the potential cost savings of migrating from a single tenant to multi-tenant model based on metrics like infrastructure needs, deployment efforts, and customer growth projections over time.