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Keel vs self-managed ELK

The free stack isn't free.
You're paying in engineers.

Self-managed ELK made sense when the alternative was a six-figure SaaS bill. But a production cluster quietly eats infrastructure budget and 10–20 engineer-hours a month — and it will never write a query for you or investigate an alert at 3 a.m. Here's the honest comparison.

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The hidden invoice

What "free" actually costs at 50 GB/day.

Figures consistent with published ELK TCO studies for a production-grade deployment with HA and sensible retention.

~$12K/yr

Infrastructure

Hot-tier nodes with fast disk, replicas for HA, plus staging. Grows step-wise every time a shard fills.

10–20 hrs/mo

Care and feeding

Upgrades, shard rebalancing, index lifecycle tuning, mapping explosions, disk-pressure alerts — the cluster is a system you operate, forever.

~0.2 FTE

Engineer time

$35K–$45K/yr of a senior engineer's loaded cost — spent keeping the log platform alive instead of shipping.

$0

AI included

No natural-language search. No automatic root cause analysis. Every investigation starts from a blank query bar — written by hand, in Lucene or KQL.

The short version

Choose based on what you actually need.

Keel is the better fit if you…

  • Run ELK for logs and are tired of being its part-time operations team
  • Want to ask anything about your logs in plain English, with automatic RCA — on the model you choose (your own key, or a local model for air-gapped sites), plus an MCP server for your own AI agents
  • Need SSO, RBAC, audit logging, and HA without licensing tiers or plugin surgery
  • Would rather budget one flat number than forecast cluster growth
  • Want a vendor on the hook for upgrades, support, and security patches

ELK is still the right call if you…

  • Use Elasticsearch as a search database for application features, not just logs
  • Have genuinely exotic indexing or query requirements that need raw engine access
  • Run at a scale with a dedicated platform team that has already automated the pain away
  • Are at hobby-project volume where a single node truly is nearly free
Side by side

The detailed comparison.

Last reviewed Oct 2026

DimensionKeelSelf-managed ELK / OpenSearch
True annual cost (50 GB/day) $14,800 flat + a VM and disk you already know how to price. $45K–$60K all-in — infrastructure plus the engineer time nobody puts in the budget.
Who operates it The appliance operates itself. Guided setup, managed upgrades, vendor support on the hook. You do. Cluster sizing, shard strategy, ILM policies, version upgrades, breakage at the worst time.
AI capabilities Native, and your model. Ask Keel anything in plain English (it answers with a result, a chart, or a summary), automatic RCA on incidents, a read-only chat assistant over your runbooks, and an MCP server for your own AI agents. Bring your own Anthropic, OpenAI or Gemini key, any OpenAI-compatible endpoint, or a local model — for AI, only the context for that request leaves, to the endpoint you control, or nothing at all in local mode. None built in. Assistant features require Elastic's paid tiers and/or cloud connectivity; OpenSearch offers building blocks, not outcomes.
Search experience Ask Keel anything — ask in plain English and Keel answers with a result, a chart, or a summary you can save and pin. Read-only SQL for power users. Lucene / KQL / DSL — powerful, but every investigation starts with someone who knows the syntax.
High availability 3-node HA cluster with automatic failover — a supported configuration, not a design project. DIY. Achievable and well-documented — but it's your design, your quorum math, your split-brain risk.
Security & access control SSO (LDAP/RADIUS, SAML, OIDC), MFA, RBAC, audit logging — included at every tier. Varies by distribution and license tier — historically where "free" stopped being free.
Ingest compatibility OTLP gRPC/HTTP, syslog, Fluentd — your existing shippers repoint with a config change. Beats, Logstash, Fluentd, OTel — mature and flexible.
Retention Your disk, your call — no enforced cap. Your disk, your call — plus the ILM tuning to keep the cluster healthy as it grows.
Air-gap operation Fully supported, AI included — run a local model via any OpenAI-compatible endpoint, nothing leaving the network. Works offline — minus any AI or assistant capability.
Flexibility as a search engine Purpose-built for logs — not a general-purpose document store. Unmatched. If you need a search database for product features, this is the right tool.

A concrete example: 50 GB/day

Production-grade cluster with HA and 90-day retention vs a Keel Growth appliance.
Self-managed ELK — infra + ~0.2 FTE engineer time≈ $50,500 / yr
Keel Growth — all features included$14,800 / yr
≈ $35,700 back every year — and your engineers get their nights and sprint capacity back.
Modeled from published ELK TCO studies: infrastructure at ~$250 per GB/day per year plus engineering from ~0.15 FTE at $180K loaded cost. Full methodology →

Where we'll be straight with you

If Elasticsearch powers search inside your product, keep it — that's what it's genuinely great at, and Keel doesn't try to be a general-purpose search database. And at a few GB a day on a single node with no HA requirement, ELK really is close to free. The comparison changes when logs become an operational and compliance workload: HA, access control, retention, and someone on the hook when it breaks. That's the point where "free" starts costing more than a license — and where Keel is built to take over.

Migration path

Your shippers stay. Only the destination changes.

1

Boot the appliance

Import the OVA/VHDX/QCOW2 next to your cluster. Dual-ship one noisy source — Fluentd and OTel repoint with a config change; Beats routes via your existing pipeline.

2

Compare for 30 days

Same data, both systems. Let your on-call try plain-English search against hand-written DSL, and let automatic RCA take a few real alerts end to end.

3

Decommission gradually

Repoint sources source by source, let old indices age out, then reclaim the cluster's hardware — and the 10–20 hours a month that went with it.

Questions

Keel vs ELK — FAQ

ELK is free — why would we pay for Keel?
The software is free; the system is not. Independent TCO studies consistently put a production-grade 50 GB/day ELK deployment at $45K–$60K per year once you count compute, storage, and the 10–20 engineer-hours a month a healthy cluster demands — before incident-driven firefighting. Keel's Growth plan is a flat $14,800/year on a single appliance you don't babysit, and it includes AI-native search, automatic RCA, SSO, RBAC, and HA you'd otherwise build or license.
Can Keel really replace our ELK stack?
For log ingest, storage, search, dashboards, and alerting — yes. Keel is OpenTelemetry-native and accepts OTLP, syslog, and Fluentd, so existing Beats/Fluentd/OTel pipelines repoint with a config change. Dual-ship one source first and migrate gradually. If you use Elasticsearch as a general-purpose search database for application features, that's a different workload — keep it there.
We're on OpenSearch — does the comparison change?
Not materially. OpenSearch removes license anxiety but none of the operational burden — cluster sizing, shard management, upgrades, and index lifecycle tuning are the same work. The cost model and the absence of built-in local AI are the same story.
Does Keel work air-gapped like our ELK does?
Yes — including the AI. Keel ships as a single VM appliance and requires no phone-home. For air-gapped sites, point its AI at a local model via any OpenAI-compatible endpoint (for example Ollama) and use offline licensing — then asking Keel anything in plain English, automatic RCA and the read-only assistant run fully offline, with nothing leaving your network. Where you have connectivity you can instead bring your own hosted Anthropic, OpenAI, or Google Gemini key; the model is always your choice.
What happens to our Kibana dashboards?
They'll need rebuilding — we won't pretend otherwise. In practice teams rebuild the handful of dashboards they actually look at during the POC, and skip the graveyard of ones nobody opened in a year. The guided POC includes our team helping port your key views.

Give your engineers their
nights back.

Full-feature 30-day POC inside your network. We deploy the appliance, connect your sources, and your team compares it against the cluster on real data. No credit card, nothing to cancel.

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