Softwr

Cloud · head to head

HAProxy vs Kentik

HAProxy logo

HAProxy

Cloud

High-performance TCP and HTTP load balancer

From
Free
Rated
-
Full reviewWebsite
Kentik logo

Kentik

Networking

Network observability platform built on flow and traffic data, sold on annual-only contracts starting around $24,000/year

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only HAProxy has a free tier, so it costs nothing to try first.
  • Each has a real cost: HAProxy configuration syntax is dense and unforgiving, with a steep initial learning curve; Kentik contracts are annual only, so there is no monthly option for a team wanting to trial the platform under real production load before committing to a year of spend
  • They diverge on capability: HAProxy covers High throughput, Kentik covers Flow-based traffic analysis.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which HAProxy and Kentik actually diverge.

Attributes where HAProxy and Kentik differ
AttributeHAProxyKentik
Starting priceFreeOn request
Pricing modelOpen source, no licence feeAnnual contract only, per tier
Free tierYesNo
PlatformsLinux, Docker, Kubernetes, Self-hostedWeb, API
CategoryCloudNetworking

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

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 HAProxy

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

Only in Kentik

  • Flow-based traffic analysis
  • Synthetic testing
  • Cloud network monitoring
  • DDoS detection
  • API-driven querying

What people use each for

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

HAProxy

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

Kentik

  • A network engineering team at an ISP or large enterprise needing flow-level traffic visibility beyond basic uptime monitoringnot HAProxy
  • A cloud-heavy organisation wanting visibility into cloud provider network cost and performance across multiple providersnot HAProxy
  • A security or network operations team wanting DDoS detection layered on top of standard traffic monitoringnot HAProxy
  • A team needing synthetic testing alongside passive flow analysis in one platform rather than two separate toolsnot HAProxy

Where each one falls short

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

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

Kentik

  • Contracts are annual only, so there is no monthly option for a team wanting to trial the platform under real production load before committing to a year of spend
  • The Pro tier's $24,000/year starting price is a serious commitment relative to general infrastructure monitoring tools, and it is aimed specifically at flow-level traffic visibility rather than general host monitoring
  • Add-on modules for advanced DDoS protection, service provider analytics and the Firehose pipeline are priced separately, so real deployment cost frequently exceeds the Pro sticker price
  • Premier tier pricing is entirely quote-based, so organisations needing more than Pro's limits (50 users, 1,000 FPS, 120-day retention) cannot get a number without a sales conversation
  • It is a specialised flow and traffic analytics tool, not a general infrastructure monitoring platform, so most buyers will still need a separate tool like PRTG or Icinga for host and service uptime checks
  • Data retention is capped at 120 days for traffic and 45 days for forensic data even on Pro, which may be short for organisations with longer compliance or investigation requirements

Pricing, plan by plan

HAProxy

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

Kentik

On request
  • Pro$24000/year
    • 50 users
    • 1,000 flows per second baseline
    • 2.5M synthetics credits
  • Premier$undefined/year
    • 1,000 users
    • 5M synthetics credits
    • Custom dimensions and scheduled reporting

Which should you pick?

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

Choose Kentik if

  • You need flow-based traffic analysis.
  • You work on Web, API.
  • You also want synthetic testing.
Kentik review

Questions people ask

Is HAProxy or Kentik better?
Neither clearly leads. HAProxy starts at Free and Kentik at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, HAProxy or Kentik?
HAProxy has a free tier; the other does not. Paid plans start at Free for HAProxy and On request for Kentik.
Does HAProxy or Kentik run on more platforms?
HAProxy runs on Linux, Docker, Kubernetes, Self-hosted. Kentik runs on Web, API.
Can I use HAProxy for free?
Yes. HAProxy has a free tier, so you can try it without paying. Kentik starts at On request.
What is HAProxy best used for?
HAProxy is most often used for load balancing at traffic levels where proxy efficiency shows up in the hardware bill, precise traffic control — rate limits, sticky sessions, complex routing rules, tcp load balancing for databases and non-http services. Of those, load balancing at traffic levels where proxy efficiency shows up in the hardware bill and precise traffic control — rate limits, sticky sessions, complex routing rules are not what Kentik is typically brought in for.
What can HAProxy do that Kentik cannot?
HAProxy covers High throughput, Layer 4 and 7, Health checking, Rate limiting and ACLs. Kentik covers Flow-based traffic analysis, Synthetic testing, Cloud network monitoring, DDoS detection.

Answered from the vendors’ own pages

HAProxy: Is HAProxy free?

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

Kentik: Is there a monthly billing option?

No, Kentik states contracts are annual only.

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.

Kentik: What is the entry price?

Pro starts at $2,000/month billed as $24,000/year for 50 users and baseline flow and synthetics quotas.

HAProxy: Does HAProxy handle TLS certificates automatically?

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

Kentik: Does Kentik replace general infrastructure monitoring tools like PRTG?

No, it is focused on flow-based traffic and network observability rather than general host and service uptime monitoring.

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