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Networking · head to head

Headscale vs Prometheus

Headscale logo

Headscale

Networking

Open source reimplementation of the Tailscale coordination server for a single organisation

From
Free
Rated
-
Full reviewWebsite
Prometheus logo

Prometheus

Networking

Open source monitoring and alerting toolkit for cloud native environments

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Headscale the clients are proprietary software maintained by a company with no obligation to Headscale, so a client update can change protocol behaviour and break your control server until volunteers catch up.; Prometheus not suitable for per-request billing as collected data lacks 100% accuracy
  • They diverge on capability: Headscale covers Self hosted control server, Prometheus covers Multi-dimensional Data Model.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Headscale and Prometheus actually diverge.

Attributes where Headscale and Prometheus differ
AttributeHeadscalePrometheus
Pricing modelOpen source, no licence feeopen-source
PlatformsLinux, DockerLinux, macOS, Windows
FoundedUnknown2015

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Networking).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Headscale

  • Self hosted control server
  • Access control policies
  • User separation
  • Pre-authentication keys
  • Subnet routers and exit nodes
  • Own or shared DERP

Only in Prometheus

  • Multi-dimensional Data Model
  • PromQL Query Language
  • Pull-based Collection
  • Service Discovery
  • Alerting Rules
  • Federation
  • Local Storage
  • Grafana

What people use each for

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

Headscale

  • Running a mesh network where no third party may hold the device registrynot Prometheus
  • A homelab or personal fleet where paying per user for a hosted control plane is not worth itnot Prometheus
  • Air gapped or restricted environments that cannot reach an external coordination servicenot Prometheus
  • Keeping the Tailscale client experience while removing the vendor from the trust pathnot Prometheus

Prometheus

  • Monitoring and alerting systemnot Headscale
  • Time-series databasenot Headscale
  • Infrastructure metrics collectionnot Headscale

Where each one falls short

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

Headscale

  • The clients are proprietary software maintained by a company with no obligation to Headscale, so a client update can change protocol behaviour and break your control server until volunteers catch up.
  • Features that live on the vendor side, including the admin console, Funnel and app connectors, do not exist here and cannot be added, so feature comparisons against Tailscale are misleading.
  • There is no official web interface, so day to day administration is a command line tool or one of several unofficial front ends of varying quality and maintenance.
  • It is deliberately single tenant, so a managed service provider cannot use one deployment to serve several customer networks.
  • Upgrades have required database migrations and policy format changes between releases, and with no support contract a failed migration on the control server is your problem alone.

Prometheus

  • Not suitable for per-request billing as collected data lacks 100% accuracy
  • Hard limit on scrape body size; large responses cause scrape failure
  • Per-scrape sample limit enforced; exceeding limit marks targets as failed
  • Not designed for long-term durable storage; optimised for metrics collection

Pricing, plan by plan

Headscale

Free
  • HeadscaleFree
    • Full functionality, no node limit
    • Official Tailscale clients on every platform
    • No vendor account required

Prometheus

Free
  • Prometheus (Open Source)Free
    • 100% open source
    • Community-driven project
    • Apache 2 License

Which should you pick?

Choose Headscale if

  • You need self hosted control server.
  • You want to start without paying.
  • You work on Linux, Docker.
  • You also want access control policies.
Headscale review

Choose Prometheus if

  • You need multi-dimensional data model.
  • You want to start without paying.
  • You work on Linux, macOS, Windows.
  • You also want promql query language.
Prometheus review

Questions people ask

Is Headscale or Prometheus better?
Neither clearly leads. Headscale starts at Free and Prometheus at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Headscale or Prometheus?
Headscale starts at Free and Prometheus at Free.
Does Headscale or Prometheus run on more platforms?
Headscale runs on Linux, Docker. Prometheus runs on Linux, macOS, Windows.
Can I use Headscale for free?
Both have a free tier, so you can try either at no cost before committing.
What is Headscale best used for?
Headscale is most often used for running a mesh network where no third party may hold the device registry, a homelab or personal fleet where paying per user for a hosted control plane is not worth it, air gapped or restricted environments that cannot reach an external coordination service, keeping the tailscale client experience while removing the vendor from the trust path. Of those, running a mesh network where no third party may hold the device registry and a homelab or personal fleet where paying per user for a hosted control plane is not worth it are not what Prometheus is typically brought in for.
What can Headscale do that Prometheus cannot?
Headscale covers Self hosted control server, Access control policies, User separation, Pre-authentication keys. Prometheus covers Multi-dimensional Data Model, PromQL Query Language, Pull-based Collection, Service Discovery.

Answered from the vendors’ own pages

Headscale: Is Headscale made by Tailscale?

No. It is an independent community project. Tailscale acknowledges it but does not support it, and the clients it relies on are the vendor ones.

Prometheus: What does Prometheus cost?

Prometheus is completely free and open source. There are no pricing tiers or paid plans. The entire project is licensed under Apache 2 and hosted on GitHub.

Source
Headscale: What do I lose compared with the hosted service?

The admin console, the vendor relay network unless you use the public DERP servers, and hosted only features such as Funnel and app connectors.

Prometheus: Is Prometheus commercial software or free?

Prometheus is 100% open source and community-driven. It is a CNCF graduated project with no commercial restrictions or licensing fees.

Source
Headscale: Can I still use the public relay servers?

Yes, the default configuration can use them, though many self hosters run their own DERP to remove that dependency.

Prometheus: How is Prometheus licensed?

Prometheus is licensed under the Apache 2 License, which permits free use, modification, and distribution for commercial and non-commercial purposes.

Source
Headscale: Is it suitable for a company network?

For a technical team, yes. There is no vendor to escalate to, so it needs someone on staff who is willing to own the control server.

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