The best open source alternative to Heroku is OpenShift. If that doesn't suit you, our users have ranked more than 100 alternatives to Heroku and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Heroku are Coolify, Kubernetes, SwiftWave and Appwrite.
Red Hat OpenShift is a trusted, comprehensive, and consistent platform to develop, modernize, and deploy applications at scale, including today’s AI-enabled apps. Deliver better experiences faster with a complete set of services for bringing apps to market on your choice of infrastructure.
has nothing to do with hosting
SwiftWave is a self-hosted, lightweight PaaS solution for easily deploying and managing your applications on any server. It's an open-source alternative to Heroku, Netlify, and Render.
Secure open-source backend server for web and mobile developers. Appwrite provides developers with a set of easy-to-use and integrate REST APIs to manage their core backend needs.
Qovery is the first Container as a Service (CaaS) platform that allows any developer to deploy an application in just a few seconds.
Cloudify is an orchestration-first, model-driven cloud management platform native to Network function virtualization (NFV), that is open source and based on the TOSCA standard.
Porter is an alternative to Heroku that runs in your own cloud (AWS, GCP, DigitalOcean, etc). Get started on Porter without the overhead of DevOps and fully customize your infra later when you need to.
Radius is an open-source, cloud-native, application platform that enables developers and the operators that support them to define, deploy, and collaborate on cloud-native applications across public clouds and private infrastructure.
Kubero is a fully self-hosted Internal Developer Platform (IDP) that brings the workflows of Heroku to your Kubernetes cluster. It enables you to deploy your applications with a few clicks on the Dashboard or by CLI.
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You need to host kubernetes somewhere, it is not a service provider.