Both KubeVirt-based. Different commercial models, different operational footprints.
Pairs with: Ænix Private Cloud Platform — regulated enterprises evaluating an OpenShift alternative, including the developer self-service layer that replaces the OpenShift developer experience.
| OpenShift Virtualization | Cozystack | |
|---|---|---|
| Licence | Red Hat commercial subscription | Apache 2.0 |
| Foundation | OpenShift + KubeVirt | Kubernetes + KubeVirt + Cilium + LINSTOR |
| Operational footprint | OpenShift broad | Cozystack focused |
| Multi-tenancy | Project CRD + namespaces | Tenant CRD (nested) |
| Vendor relationship | Red Hat / IBM | Optional: Ænix, or none — the code is Apache 2.0 either way |
| Cost model | Red Hat subscription per core pair or socket pair | Free + optional support tier |
| Best for | Existing Red Hat customers | Open-source-first, service providers |
Operators and certified images — the part that usually decides it
The comparison table understates what OpenShift customers actually buy. OperatorHub with Red Hat-certified operators, UBI base images with a supported lifecycle, and a vendor who will take a support call about a third-party operator running on their platform: that ecosystem is real, and for an organisation whose procurement requires a certified image for every workload, it settles the question. Cozystack has no equivalent certification programme and does not claim one.
What Cozystack offers instead is a smaller set of managed services maintained as part of the platform itself — PostgreSQL, MariaDB, ClickHouse, Kafka, RabbitMQ, Valkey, S3, managed Kubernetes — rather than a marketplace of operators you assemble and then own. Upstream operators (CNPG, Strimzi, anything else) run on it normally; they are simply your responsibility, as they are on any Kubernetes.
One correction to the usual comparison, in Red Hat’s favour: an OpenShift Virtualization deployment does not have to be priced as full OpenShift. Red Hat sells OpenShift Virtualization Engine as a VM-only SKU, which materially changes the arithmetic for an estate that is mostly virtual machines. Compare against that SKU, not against the platform subscription, or the cost case you build will not survive contact with a Red Hat account team.
Read it this way: if your constraint is “every component must be vendor-certified and supported by one throat to choke”, OpenShift is the correct answer and this page will not change that. If your constraint is licence cost and operational surface area, the trade goes the other way.
For Red Hat shops — OpenShift Virtualization fits. For open-source-first or service-provider model — Cozystack.
See OpenShift alternative for when moving off OpenShift makes sense, migrating from IBM platforms for Red Hat / IBM estates, and the OpenShift vs Cozystack article for more detail.
Ænix created Cozystack (CNCF Sandbox project) and co-maintains it with maintainers from other companies. On top of it we offer Ænix Public Cloud Platform, Ænix Private Cloud Platform and Ænix AI Platform.