Open-source Azure Container Apps alternatives

Sealos describes itself as an AI-native cloud operating system built on Kubernetes. It aims to cover the whole application lifecycle in one platform, from development in cloud IDEs to production deployment and day-to-day management, and it targets teams building AI applications, SaaS platforms, managed databases and microservice architectures.

Core pieces include Devbox cloud development environments that can be opened from editors such as VS Code and Cursor, managed MySQL, PostgreSQL, MongoDB and Redis databases, S3-compatible object storage, and an App Launchpad for deploying Docker images. An app store offers one-click deployment of larger applications, and workspace-based multi-tenancy supports enterprise use. Full Kubernetes remains accessible underneath.

Sealos is written mainly in TypeScript and Go and runs on Kubernetes. Repository topics point to cluster installation features such as high-availability Kubernetes through kubeadm, and the project offers a hosted cloud at sealos.io. The repository lists the license as 'Other', so check the license file for the exact terms.

Rainbond is an open-source application platform that sits on top of Kubernetes and hides most of its complexity. Teams use a graphical interface to build, deploy, assemble and manage applications, so developers and operators without Kubernetes expertise can still run workloads on clusters.

The project describes a unified way to deploy ordinary business applications, projects generated by AI, open-source AI tools and LLM services, with AI assisting in deployment and operation. It targets private, self-hosted deployments on your own servers or Kubernetes clusters, and its README states that the core capabilities are fully open source.

The code is written in Go and published under a license that GitHub lists as 'Other', so review its terms before adopting it. Documentation and a Chinese-language README are provided, and the platform suits teams that want an internal PaaS and application delivery layer over Kubernetes.

OpenFaaS is a serverless platform that lets developers run event-driven functions and microservices on Kubernetes with little boilerplate code. Your code or a ready-made binary goes into an OCI-compatible container image, and you receive a scalable HTTP endpoint that auto-scales and exposes metrics.

Highlights include ease of use through a UI portal and a one-click install, and the ability to write services and functions in many languages. The project integrates with Prometheus for metrics and with GitOps workflows, and its topics place it in the functions-as-a-service and PaaS categories. The gateway and tooling are written in Go.

Licensing needs attention. The README states that the Community Edition is licensed for individual exploration and hobbyist use, with a 60-day limit for commercial proofs of concept, and that commercial and production use calls for the paid OpenFaaS Standard or Enterprise editions. GitHub reports the license as 'Other'. You run it on your own Kubernetes cluster.

Epinio is an opinionated platform that runs on Kubernetes and takes developers from code to a URL in one step. It exists because Kubernetes has a steep learning curve and operating it well can be a full-time job, while developers would rather spend time on their applications; Epinio adds abstractions and tools so Kubernetes can be used like a PaaS.

The goals are that no Kubernetes experience is needed, there is no steep learning curve, local setup is quick with minimal configuration, and deploying to production works the same as deploying in development. It requires a Kubernetes cluster with an Ingress Controller and cert-manager, after which installation is a short step. The Epinio CLI is installed from a release binary or Homebrew, and a quick-start tutorial walks through creating a namespace and pushing an application. Security features include a TLS-secured API server and basic authentication.

Epinio is written in Go, licensed under Apache-2.0, documented at docs.epinio.io and discussed on the Rancher Users Slack. You run it on your own cluster.