What it is

WunderGraph Cosmo is an open-source lifecycle API management platform for federated GraphQL. It lives in the GraphQL ecosystem, and its GitHub description identifies it as an alternative to Apollo Studio and GraphOS. The project is written in TypeScript and released under the Apache-2.0 license.

The problem it addresses is combining many GraphQL services into one graph. Federation lets separate teams maintain smaller schemas, and those schemas are combined into one graph. Cosmo supports both monolithic and federated architectures, so teams can use it while they move from a single schema to a distributed model. It also provides routing, schema registry, composition checks, analytics, metrics, and tracing for that combined graph.

Key capabilities

• It provides a schema registry for federated GraphQL schemas, so teams can manage the graph over time.
• It runs composition checks, which help validate that multiple service schemas can be combined into a usable federated graph.
• It includes a GraphQL router, listed in the topics as graphql-router, for serving the combined API surface.
• It provides analytics, metrics, and tracing for the federated graph.
• It supports both monolithic and federated architectures, according to the README overview.
• It can be deployed entirely on-premises or used through a managed service, without vendor lock-in under the Apache-2.0 license.
• It provides examples for local composition, Docker Compose evaluation, and Kubernetes deployment through an official Helm Chart.

Who uses it and how

• Developers use it to compose a federated GraphQL schema locally from multiple services and run the Cosmo Router.
• Architects use it to evaluate the entire Cosmo Platform for an organization by running it locally with Docker Compose.
• Platform engineers use it to deploy the full platform to Kubernetes through the official Helm Chart.
• Teams use it when they need a shared GraphQL surface across services, because the README describes federation as a way to combine schemas maintained by different teams.
• Organizations considering Apollo Studio or GraphOS use it as an open-source alternative under Apache-2.0, with either self-hosting or a managed service.

Getting started

The README directs users to clone https://github.com/wundergraph/cosmo.git, choose an example, and follow the linked instructions. It also mentions a managed service at https://cosmo.wundergraph.com/login, Docker Compose for local evaluation, and an official Helm Chart for Kubernetes deployment.

When to use it — and when not to

WunderGraph Cosmo is a good fit when a team wants an open-source alternative to Apollo Studio and GraphOS for federated GraphQL, especially if it needs self-hosting or wants to avoid vendor lock-in. It is less suitable for teams that do not want to evaluate self-hosted deployment paths, because the README documents Docker Compose and Kubernetes Helm Chart deployment. The listing also shows 124 open issues and zero contributors, so teams should inspect those facts before adoption.