Upsun: a Heroku alternative

Upsun and Heroku are both enterprise-grade cloud platforms offering Platform-as-a-Service (PaaS) solutions, but they differ significantly in features, sustainability, and pricing transparency. Upsun is built on Platform.sh and prioritizes developer experience with features like multicloud capabilities, sustainable hosting, persistent storage, and integrated security, while providing a transparent, usage-based pricing model. In contrast, Heroku, a long-standing player in the market, relies heavily on AWS, lacks persistent storage, and requires third-party services for many functionalities, resulting in a more complex pricing structure. Upsun supports multiple runtimes and offers comprehensive observability tools, making it appealing for modern web application development, whereas Heroku's stability and simplicity might appeal to enterprises looking for minimal change, but it may lag in innovation and feature set compared to newer competitors like Upsun.