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Cloud · head to head

VictoriaMetrics vs HAProxy

VictoriaMetrics logo

VictoriaMetrics

Cloud

Fast, cost-effective time series database for metrics

From
Free
Rated
-
Full reviewWebsite
HAProxy logo

HAProxy

Cloud

High-performance TCP and HTTP load balancer

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: VictoriaMetrics promQL compatibility is very close but not identical, and MetricsQL extensions do not port back; HAProxy configuration syntax is dense and unforgiving, with a steep initial learning curve
  • They diverge on capability: VictoriaMetrics covers PromQL compatible, HAProxy covers High throughput.

Where they differ

Only the attributes on which VictoriaMetrics and HAProxy actually diverge.

Attributes where VictoriaMetrics and HAProxy differ
AttributeVictoriaMetricsHAProxy

Identical on both: starting price (Free), pricing model (Open source, no licence fee), free tier (Yes), platforms (Linux, Docker, Kubernetes, Self-hosted), user rating (Not yet rated), category (Cloud).

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 VictoriaMetrics

  • PromQL compatible
  • Low resource use
  • Single binary or cluster
  • Remote write target

Only in HAProxy

  • High throughput
  • Layer 4 and 7
  • Health checking
  • Rate limiting and ACLs

What people use each for

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

VictoriaMetrics

  • Keeping months or years of Prometheus metrics without the memory costnot HAProxy
  • High-cardinality metrics where Prometheus strugglesnot HAProxy
  • Consolidating metrics from many Prometheus instances into one queryable storenot HAProxy

HAProxy

  • Load balancing at traffic levels where proxy efficiency shows up in the hardware billnot VictoriaMetrics
  • Precise traffic control — rate limits, sticky sessions, complex routing rulesnot VictoriaMetrics
  • TCP load balancing for databases and non-HTTP servicesnot VictoriaMetrics

Where each one falls short

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

VictoriaMetrics

  • PromQL compatibility is very close but not identical, and MetricsQL extensions do not port back
  • Smaller community than Prometheus, so fewer guides and third-party integrations
  • The clustered version has meaningfully more moving parts than the single binary suggests
  • Some enterprise features sit outside the open-source offering

HAProxy

  • Configuration syntax is dense and unforgiving, with a steep initial learning curve
  • No automatic certificate management, unlike newer servers that treat it as default behaviour
  • The built-in stats page is basic, so real observability needs exporters and dashboards
  • A dedicated load balancer is more machinery than small deployments need

Pricing, plan by plan

VictoriaMetrics

Free
  • VictoriaMetricsFree
    • Full functionality
    • No data limits
    • Community support

HAProxy

Free
  • HAProxyFree
    • Full functionality
    • No usage limits
    • Community support

Which should you pick?

Choose VictoriaMetrics if

  • You need promql compatible.
  • You want to start without paying.
  • You work on Linux, Docker, Kubernetes, Self-hosted.
  • You also want low resource use.
VictoriaMetrics review

Choose HAProxy if

  • You need high throughput.
  • You want to start without paying.
  • You work on Linux, Docker, Kubernetes, Self-hosted.
  • You also want layer 4 and 7.
HAProxy review

Questions people ask

Is VictoriaMetrics or HAProxy better?
Neither clearly leads. VictoriaMetrics starts at Free and HAProxy at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, VictoriaMetrics or HAProxy?
VictoriaMetrics starts at Free and HAProxy at Free.
Does VictoriaMetrics or HAProxy run on more platforms?
Both run on Linux, Docker, Kubernetes, Self-hosted, so platform support will not decide this one for you.
Can I use VictoriaMetrics for free?
Both have a free tier, so you can try either at no cost before committing.
What is VictoriaMetrics best used for?
VictoriaMetrics is most often used for keeping months or years of prometheus metrics without the memory cost, high-cardinality metrics where prometheus struggles, consolidating metrics from many prometheus instances into one queryable store. Of those, keeping months or years of prometheus metrics without the memory cost and high-cardinality metrics where prometheus struggles are not what HAProxy is typically brought in for.
What can VictoriaMetrics do that HAProxy cannot?
VictoriaMetrics covers PromQL compatible, Low resource use, Single binary or cluster, Remote write target. HAProxy covers High throughput, Layer 4 and 7, Health checking, Rate limiting and ACLs.

Answered from the vendors’ own pages

VictoriaMetrics: Is VictoriaMetrics free?

The open-source version is free with no data limits. An enterprise edition and cloud service are paid.

HAProxy: Is HAProxy free?

Yes, the community version is open source. HAProxy Technologies sells HAProxy Enterprise separately.

VictoriaMetrics: Does it replace Prometheus?

It can, but most teams keep Prometheus for scraping and use VictoriaMetrics as the long-term store behind it.

HAProxy: HAProxy or Nginx?

HAProxy is a specialist load balancer with deeper balancing and health-check features. Nginx also serves static content and is more approachable, which is why it is more common as a general web server.

VictoriaMetrics: Is PromQL fully supported?

Very nearly. It implements PromQL and extends it with MetricsQL, though a small number of edge-case behaviours differ.

HAProxy: Does HAProxy handle TLS certificates automatically?

No. Certificate issuance and renewal are external, unlike Caddy where it is automatic.

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