WunderGraph Cosmo
A drop-in replacement for Apollo GraphOS
SubscriptionOpen SourceAPI19,688 impressions#125 of its week
WunderGraph Cosmo is an open-source GraphQL federation platform for building, managing and scaling federated APIs.
- for
- Platform and engineering teams needing self-hosted or managed GraphQL federation.
- pricing
- freemium
- license
- Apache-2.0
- wgc@0.132.016 days ago
- studio@0.182.016 days ago
- router@0.353.016 days ago
Key features
- Self-hosted Router — Run the Cosmo router on any infrastructure with full control.
- Event-Driven Federated Subscriptions — Combine GraphQL federation with Kafka, NATS or Redis for scalable subscriptions.
- OpenTelemetry & Prometheus Support — Integrates with existing observability stacks for metrics and tracing.
- Custom Router Modules — Extend the router with Go modules or gRPC plugins.
- Schema Registry & Studio — Manage schemas, query plans and analytics via a unified UI.
- Enterprise-grade Security — SOC 2 compliance, OIDC, SCIM and role-based access control on Cosmo Cloud.
Use cases
- Add federation to existing microservices without changing schemas
- Scale GraphQL subscriptions using event-driven backends
- Deploy a compliant GraphQL gateway in a private cloud
- Monitor query performance with built-in tracing and metrics
WunderGraph Cosmo pricing
- Launch$499/month2 federated graphs · 250M requests/month · Email support
- Scale$3499/month5 federated graphs · 1B requests/month · SSO & RBAC · 30-day data retention
WunderGraph Cosmo vs alternatives
| Best for | Open-source GraphQL federation platform | General API composition | Image processing | LLM app analytics | Backend tooling |
|---|---|---|---|---|---|
| Pricing | Freemium | Free | Free | Subscription | Subscription |
| DevHunt upvotes | 5 | 38 | 95 | 89 | 46 |
| Launched | Jan 2023 | Jan 2023 | Feb 2024 | Jan 2023 | Mar 2024 |
- WunderGraph Cosmo vs WunderGraph: WunderGraph is the core platform; Cosmo is the dedicated federation layer with open-source router and studio.
- WunderGraph Cosmo vs imgproxy: Imgproxy focuses on image processing, not GraphQL federation.
- WunderGraph Cosmo vs Langfuse: Langfuse provides LLM observability, unrelated to GraphQL federation.
- WunderGraph Cosmo vs Keel: Keel offers backend services but does not provide a full federation router and studio like Cosmo.
WunderGraph Cosmo FAQ
Can I migrate from Apollo GraphOS to Cosmo?+
Yes, Cosmo supports Apollo Federation directives, allowing one-click migration of subgraphs without schema changes.
Is Cosmo open source?+
Cosmo is 100 % open source under the Apache 2.0 license and can be self-hosted anywhere.
What compliance certifications does Cosmo Cloud have?+
Cosmo Cloud is SOC 2 compliant and offers optional SLAs, SSO, SCIM and RBAC.
How does Cosmo handle query planning performance?+
It uses breadth-first batching, single-flight deduplication, query-plan caching and cache warming to reduce overhead.
What subscription protocols are supported?+
Federated subscriptions are available via Server-Sent Events (SSE) and WebSockets.
Can I extend the router with custom logic?+
Yes, you can add custom modules written in Go or gRPC plugins to the Cosmo router.
Summarized by DevHunt from wundergraph.com · Sep 28, 2026. Details may change; check the official site.