Comparison · Kubernetes cost
Kubecost vs. OpenCost
This one confuses people because the two share DNA: Kubecost is built directly on top of OpenCost. Kubecost's team donated OpenCost to the CNCF in 2022, and it's been an Incubating project since 2024. So the real question isn't "which is better" — it's "where does the free engine stop being enough?"
On this page
At a glance
| OpenCost | Kubecost | |
|---|---|---|
| What it is | CNCF Incubating project; the allocation standard | Commercial product built on OpenCost |
| Cost | Free, self-hosted | Free tier + paid enterprise |
| UI | Basic; often paired with Grafana | Full product UI, dashboards |
| Data retention | Depends on your Prometheus | Longer on paid; free tier limited (~15 days) |
| Support | Community only, no SLA | Enterprise support & SLA |
| Optimization | Visibility only | Savings recommendations (still manual to apply) |
OpenCost — the free, vendor-neutral standard
OpenCost is the natural first stop for visibility-only needs. It defines the vendor-neutral standard for Kubernetes cost allocation, is flexible and transparent, and makes a strong foundation for internal cost dashboards built on Prometheus and Grafana. Best for open-source teams and early-stage FinOps practices.
The trade-off is support: it's community-supported. File a GitHub issue and you're relying on volunteer maintainers — no SLA, no guaranteed response, no escalation path. You also build and maintain more of the surrounding tooling yourself.
Kubecost — the product layer on top
Kubecost wraps the OpenCost engine in a full product: a richer UI, longer retention, alerting, and savings recommendations, plus enterprise support. Its free tier is popular but capped — common friction points are a 250-core ceiling, ~15-day retention, and daily-only granularity on the free tier.
Note that following IBM's 2024 acquisition of the Kubecost team, some organizations have been re-evaluating their tooling around renewal and pricing — a big driver of the "Kubecost alternatives" search.
When to switch — in either direction
- Start on OpenCost if you have Prometheus/Grafana in place, want zero license cost, and have the engineering time to run it.
- Move to Kubecost when you need longer retention, hourly granularity, alerting, and a support SLA — or when the DIY dashboard maintenance outweighs the license.
- Move off both when you need automated optimization (see below) or Kubernetes cost unified with the rest of your multi-cloud bill.
See these in the directory
The gap both of them share
The theme across nearly every Kubernetes cost comparison is the visibility-vs-action gap. Both Kubecost and OpenCost answer "what does this cost?" Neither answers "how do we reduce it?" Given that average CPU utilization across production clusters sits around 8%, that gap is expensive. To close it, you need an optimization platform — Cast AI, ScaleOps, or StormForge — that actually enforces rightsizing, bin-packing, and spot usage. That's the subject of the alternatives guide.
FAQ
What is the difference between Kubecost and OpenCost?
OpenCost is the free, open-source CNCF project that defines the standard for Kubernetes cost allocation. Kubecost is a commercial product built directly on top of OpenCost, adding a richer UI, longer retention, alerting, savings recommendations, and enterprise support.
Is OpenCost really free?
Yes — a CNCF Incubating project, community-supported and free to self-host. The trade-off is support: no SLA, no guaranteed response time, and no escalation path.
Do Kubecost or OpenCost reduce my bill automatically?
No. Both are visibility tools. Actual remediation stays manual. To automate rightsizing, bin-packing, and spot usage you need an optimization platform like Cast AI, ScaleOps, or StormForge.
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