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Developer Tools · head to head

Keil MDK vs Proxmox VE

Keil MDK logo

Keil MDK

Developer Tools

Microcontroller Development Kit for Arm-based devices

From
Free
Free plan
Yes
Full reviewWebsite
Proxmox VE logo

Proxmox VE

Cloud

Open-source hypervisor combining KVM and LXC virtualisation

From
€120/year
Free plan
No
Full reviewWebsite

The short version

  • Only Keil MDK has a free tier, so it costs nothing to try first.
  • Each has a real cost: Keil MDK pricing for Essential and Professional subscriptions not disclosed on primary site; Proxmox VE per-socket licensing model: cost scales with CPU socket count, not vCore count, resulting in high costs for multi-socket servers
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Keil MDK and Proxmox VE actually diverge.

Attributes where Keil MDK and Proxmox VE differ
AttributeKeil MDKProxmox VE
Starting priceFree€120/year
Pricing modelfreemiumsubscription
Free tierYesNo
PlatformsWebLinux, Web, API, Self-hosted
CategoryDeveloper ToolsCloud

Identical on both: user rating (Not yet rated).

What people use each for

The jobs each tool is most often brought in to do.

Keil MDK

  • Embedded software developmentnot Proxmox VE
  • ARM microcontroller programmingnot Proxmox VE
  • Professional development environmentsnot Proxmox VE

Proxmox VE

  • Open-source datacenter virtualisation for hosting providers and cloud platformsnot Keil MDK
  • Cost-sensitive enterprise virtualisation replacing commercial hypervisorsnot Keil MDK
  • High-availability clustering for disaster recovery and business continuitynot Keil MDK
  • Container deployments using LXC as lighter-weight alternative to Dockernot Keil MDK
  • Hybrid VM and container workloads in a single management interfacenot Keil MDK
  • Backup and archival infrastructure alongside primary virtualisationnot Keil MDK

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Keil MDK

  • Pricing for Essential and Professional subscriptions not disclosed on primary site
  • Customers must contact Arm Developer Tools store for subscription rates

Proxmox VE

  • Per-socket licensing model: cost scales with CPU socket count, not vCore count, resulting in high costs for multi-socket servers
  • Linux-based host only; Windows hypervisors not supported, limiting adoption in Windows-focused organisations
  • Clustering and high-availability setup requires operational expertise and careful network configuration
  • Commercial support tiers limit advanced features (just-in-time access, network flow logs) to paid subscriptions
  • Smaller ecosystem of third-party plugins and integrations compared to VMware vSphere

Pricing, plan by plan

Keil MDK

Free

No published plan breakdown. See the Keil MDK review.

Proxmox VE

€120/year
  • Community$120/year
    • Enterprise Repository access
    • Community forum support only
    • Per-socket subscription model
  • Basic$370/year
    • 3 support tickets per year
    • 1 business day response time
    • Stable updates and Enterprise Repository
  • Standard$550/year
    • 10 support tickets per year
    • 4-hour response time for critical issues
    • Remote SSH support and offline updates
  • Premium$1100/year
    • Unlimited support tickets
    • 2-hour response time for critical issues
    • Remote SSH support and offline updates

Which should you pick?

Choose Keil MDK if

  • You want to start without paying.
Keil MDK review

Choose Proxmox VE if

  • You work on Linux, Web, API, Self-hosted.
Proxmox VE review

Questions people ask

Is Keil MDK or Proxmox VE better?
Neither clearly leads. Keil MDK starts at Free and Proxmox VE at €120/year, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Keil MDK or Proxmox VE?
Keil MDK has a free tier; the other does not. Paid plans start at Free for Keil MDK and €120/year for Proxmox VE.
Does Keil MDK or Proxmox VE run on more platforms?
Keil MDK runs on Web. Proxmox VE runs on Linux, Web, API, Self-hosted.
Can I use Keil MDK for free?
Yes. Keil MDK has a free tier, so you can try it without paying. Proxmox VE starts at €120/year.
What is Keil MDK best used for?
Keil MDK is most often used for embedded software development, arm microcontroller programming, professional development environments. Of those, embedded software development and arm microcontroller programming are not what Proxmox VE is typically brought in for.

Answered from the vendors’ own pages

Keil MDK: Does Keil MDK have a free version?

Yes, Keil MDK Community Edition is free for non-commercial projects. Essential and Professional editions are available as monthly or annual subscriptions.

Source
Proxmox VE: What is the licensing model for Proxmox VE?

Proxmox VE is open-source and free to deploy. Optional subscription tiers provide technical support, priority response times, and access to the Enterprise Repository for stable update channels. All tiers include identical virtualisation features.

Source
Keil MDK: How much do Keil MDK paid editions cost?

Specific pricing for Essential and Professional editions is not published on the main site. Rates are available from the Arm Developer Tools store or by contacting Arm sales.

Source
Proxmox VE: Can I run Proxmox VE without a support subscription?

Yes. Community Edition (€120/year per socket) provides Enterprise Repository access with community-based support through forums. The core Proxmox VE platform is fully functional without any subscription.

Source
Proxmox VE: What hypervisors does Proxmox VE support?

Proxmox VE includes both KVM for full virtualisation and LXC for Linux containers. It does not support Xen or Hyper-V. Workloads on those platforms must be migrated or reimplemented.

Source
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