You’re considering a VMware exit. The destination shortlist includes Cozystack. This page compares the two head-to-head — what’s the same, what’s different, what migration costs, what runs better on each.
For the wider market, see Best VMware alternatives 2026 — market comparison. For our focused recommendation, see VMware alternative — our recommendation. This page assumes you’re already considering Cozystack specifically.
Pairs with: Ænix Public Cloud Platform if you sell cloud to customers, or Ænix Private Cloud Platform if you run it for your own organisation. Which side of that line you are on post-VMware decides it.
Architecture comparison
| VMware (VCF) | Cozystack | |
|---|---|---|
| Licence | Subscription only | Apache 2.0 (open source) |
| Compute | vSphere / ESXi | KubeVirt on Talos |
| Storage | vSAN | LINSTOR or SeaweedFS |
| Network | NSX | Cilium (eBPF) |
| Multi-tenancy | vCloud Director | Tenant CRD |
| Service catalog | vRealize / Aria | Service catalogue in the Cozystack Dashboard |
| Backup/DR | Site Recovery Manager (orchestrated failover) | Velero + S3 + PostgreSQL PITR + recovery runbook (no orchestrated failover) |
| GPU for VMs | NVIDIA vGPU on vSphere | Passthrough or NVIDIA vGPU on KubeVirt (your NVIDIA vGPU licence) |
| Air-gap | Supported (extra licensing) | Supported (no extra cost) |
| Ops model | Broadcom support plus a large partner and ISV channel | Ænix support through your GitOps repository and, with your approval, remote access to your clusters |
Where Cozystack is genuinely better
- Pricing — no per-CPU / per-socket subscription. Hardware plus an optional Ænix support subscription.
- Multi-tenancy — Tenant CRD is native; vCD is bolted-on legacy.
- Container workloads — Cozystack is Kubernetes-native, containers and VMs coexist on one platform. On VMware, Kubernetes is a layer added to a VM-first platform.
- Sovereignty — open source on your own hardware; volume encryption available opt-in per storage class.
- Vendor neutrality — no Broadcom-style pricing pressure on roadmap.
Where VMware is genuinely better
Not a courtesy paragraph. These are real gaps, and an architect will find them in week one.
- Two decades of operational maturity. DRS, Storage DRS, Fault Tolerance, Enhanced vMotion Compatibility, Storage vMotion between arrays, vVols. KubeVirt has live migration and a working scheduler; it does not have the same depth of automated placement and rebalancing, and it has not been beaten on by as many people for as long.
- The hardware compatibility list. VMware certifies servers, HBAs, NICs and firmware combinations, and a vendor will support you on a listed configuration. Cozystack runs on commodity hardware, which means you own that qualification.
- The backup and DR ecosystem. Veeam, Commvault, Rubrik, Zerto and Site Recovery Manager all speak VADP natively. Velero plus per-database PITR covers backup and restore with different tools and no orchestrated failover, and any runbook, retention policy or audit evidence built on the VMware ecosystem is rewritten.
- Third-party and ISV certification. Application vendors certify against ESXi. Some will not answer a support call about a workload running on KubeVirt, whatever the technical merits.
- Established procurement and integration. ServiceNow, Ansible, and the internal tooling built around vCenter over ten years is real, working investment.
If your team is deep on vSphere, renewal economics are tolerable, and no sovereignty or multi-tenancy requirement is pushing, “stay and tune” is the correct answer and we will say so.
Migration timing
| Estate size | Assessment | Total, including assessment |
|---|---|---|
| About 100 VMs | 14 or 28 days | 8-12 months |
| About 1,000 VMs | 28 days | 18-24 months |
Cohort-based migration, aligned with VCF subscription expirations; dependencies move these numbers more than VM count. The phase-by-phase plan is on the VMware migration hub.
Cost trajectory
VCF pricing is quote-driven and non-public, so there is no honest single number to print here. What the shape of the model looks like for a 200-VM estate:
- Year 1 — the remaining VCF subscription runs in parallel with assessment, platform build, migration labour and Ænix support. Cost goes up before it goes down.
- Year 2 onward — hardware refresh and depreciation plus Ænix support, with no per-CPU meter.
- Net cumulative position — in the engagements we have modelled, typically positive by the end of Year 2 and clearly positive by Year 3. Your renewal quote, hardware age and staffing decide it, which is why the number is computed in assessment rather than claimed here.
Model your own inputs with the VMware TCO comparison, where every price carries a source and a date.
- VMware alternative — our recommendation
- Best VMware alternatives 2026 — market comparison
- VMware migration hub — migration methodology
- Cozystack — platform details
- Platform Readiness Assessment
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.