Proxmox VE vs Spinifex: hypervisor management versus an AWS-compatible private cloud

A comparison published on dev.to frames the choice between two open-source platforms for self-hosted virtual machines as a question of tooling rather than features. Proxmox VE and Spinifex are both AGPLv3-licensed and both run VMs on hardware you own, but according to the post, that is roughly where the similarity ends: Proxmox is a conventional hypervisor management stack, while Spinifex exposes the AWS API itself as the interface to your own machines.

Proxmox: a mature hypervisor management layer

Proxmox VE pairs KVM for full virtual machines with LXC for lightweight Linux containers, and handles the day-to-day work — VM creation, live migration, snapshots, cluster administration — through a web interface rather than the command line. The dev.to article notes that clustering scales to 32 nodes with high availability and live migration, and that version 9.2 added a built-in dynamic load balancer. Storage is covered by native Ceph integration and ZFS support, both configurable through the UI or the REST API.

The platform's reach is significant. The post reports more than 800,000 Proxmox hosts worldwide as of early 2026, with OVHcloud and Hetzner running it in production at scale. It credits much of the growth since 2023 to organisations leaving VMware after Broadcom's acquisition and the pricing changes that followed.

The limitation the article highlights is API compatibility. Proxmox's REST API is comprehensive and well documented, but it speaks only Proxmox. A command such as aws ec2 describe-instances does nothing against a Proxmox host, so AWS tooling, Terraform AWS provider configurations and SDK integrations would need to be replaced or maintained separately.

Spinifex: the AWS API on your own hardware

Spinifex implements the same API surface as AWS — EC2, S3, IAM, EKS and other common services — on standard Linux bare metal. According to the post, calls to launch instances boot real virtual machines via QEMU, and S3 writes land in Predastore, the platform's built-in object store. The software is written in Go, licensed AGPL-3.0, installs from a release tarball via a setup script, and runs fully offline with no external control plane and no phone-home dependency.

The practical payoff is toolchain reuse. The AWS CLI, Terraform with the AWS provider, eksctl and boto3 all work against Spinifex without modification, and redirecting Terraform from AWS to Spinifex is a single provider block change, with resource definitions, modules and variable files left untouched. Spinifex does ship a web UI, but the AWS API is its primary management surface.

Where the decision gets nuanced

The article stresses that the two are not direct competitors. Each manages only the infrastructure under its own control, so they only genuinely overlap when a team is deciding where to place a new workload. Teams with no existing toolchain in either direction are effectively picking a mental model: a UI refined over more than a decade around VM lifecycle management, or an API-first workflow that will feel natural to anyone with an AWS background.

Both platforms can run without internet connectivity, but the specifics differ. Spinifex ships an offline installer with documented procedures for moving the tarball and its dependencies via USB media, plus a --no-telemetry flag to suppress the install telemetry beacon. Proxmox also runs offline, though its approach to air-gapped package management works differently.

Licensing and support

Both projects use AGPLv3. Proxmox sells optional subscriptions that add enterprise-stable package repositories and direct support from Proxmox Server Solutions GmbH without unlocking any additional software features; the community repository remains available without a subscription. Spinifex is community-supported through GitHub, with project documentation online and a free sandbox that exposes the same endpoint and credential model as a self-hosted installation for teams wanting to test the AWS API surface before committing hardware.

Why it matters

Broadcom's repricing of VMware has pushed a large cohort of organisations toward self-hosted alternatives since 2023, and Proxmox has been the most visible beneficiary of that shift. Spinifex targets a different slice of the same migration: teams whose skills, Terraform code and automation are already built around AWS. For them, keeping the AWS provider and changing one block can make self-hosting viable without retraining engineers or rewriting infrastructure code.

The comparison's most useful contribution is reframing the platform decision itself. Rather than a feature-by-feature checklist, the question becomes which interface a team already lives in — a dedicated hypervisor console or the AWS API — because that choice determines migration cost, staffing and automation reuse far more than either platform's individual capabilities.