Comparison

Radar vs k9s

k9s is a single-engineer terminal client. Radar is a team web UI for multi-cluster and history. Most SREs run both.

TL;DR
  • k9s is a terminal TUI for one engineer on one cluster. Brutally fast for kill-a-pod, tail-logs, exec. Free, no SaaS, mature plugin ecosystem (popeye etc.).
  • Radar is a web UI for teams running multiple clusters. Persistent event timeline, fleet view across clusters, no kubeconfig distribution, audit log, shared deep-links.
  • Pick Radar if you need shared team views, history beyond Kubernetes' ~1h event retention, or fleet-wide search. Pick k9s if you live in tmux + vim and your job is debugging one cluster fast.
Feature by feature

The full comparison.

Unmarked Radar checks ship in OSS (Apache 2.0) and Cloud. 'Cloud' tags are hosted-only. Where k9s wins, we mark it as a win.

Feature
Radar
OSS (Apache 2.0) + Cloud
k9s
Terminal TUI · Apache 2.0
Interface
UI
Web (vim-style shortcuts)
Terminal TUI
Runs without a browser
Yes - the whole point
Works over SSH to a jump host
Via browser port-forward
Works offline
Yes
Scope
Clusters in one view
k9s connects to one cluster per terminal instance.
Cloud (fleet) · OSS (per install)
One at a time
Cross-cluster search
Cloud
Drift detection (staging vs prod)
Cloud
Team & collaboration
Shared workspace
Cloud
Shareable deep-links
Cloud
Resource annotations
Cloud
Slack / PagerDuty / MS Teams alerts
Cloud
History
Event retention
k9s reflects live cluster state only. Kubernetes API holds events ~1h by default.
Configurable, persisted
None (live state only)
Audit log retention
Cloud · 7 days to unlimited
Post-mortem replay
Auth
SAML / OIDC SSO
Cloud
Uses local kubeconfig
SCIM provisioning
Enterprise
Inherits Kubernetes RBAC
No kubeconfig distribution required
Feature surface
Topology graph
Live workload-to-workload traffic + mTLS
Image filesystem viewer
Cost insights (OpenCost)
Both require OpenCost installed in the cluster. Radar auto-detects it.
Auto-detected
Cluster security audit (Trivy / Kyverno)
Via plugins like popeye
MCP for AI clients
Plugin ecosystem
Integrations + webhooks
Strong (k9s plugins)
Embedded shell/exec
Via Radar Shell
Full pod shell
Pricing
License
Apache 2.0 (engine) + Cloud SaaS terms
Apache 2.0
Free tier
OSS unlimited · Cloud 3 clusters
Entire tool, forever
Paid entry point
$99/cluster/mo (Cloud Team)
N/A
Concrete scenarios

What each tool does for the jobs that fill your week.

Kill a runaway pod, fast

k9s
k9s

k9s → /<pod-name> → :pods → d to delete. Under a second.

Radar

Search bar → click pod → delete. Slightly slower than k9s, but you can share the URL.

Why did the payments service crash last Tuesday?

Radar
k9s

You can't. k9s reflects live state only. Tuesday's events rolled off K8s' ~1h retention long ago.

Radar

Rewind the timeline to Tuesday. Filter by payments namespace. See the OOMKill, the image pull, the ArgoCD sync that preceded it.

Show a PM what's broken

Radar
k9s

Screenshare, terminal font size, squint. Or screenshot and paste.

Radar

Copy URL, paste in Slack. They click, they see.

Compare the same workload across 5 clusters

Radar
k9s

Switch kubeconfig, find workload, note state, switch again, repeat.

Radar

Cross-cluster search (Cloud). Type the workload name, see all 5 versions side by side.

Use keyboard shortcuts for everything

k9s
k9s

Every action has a shortcut. Pure keyboard by design.

Radar

Vim-style shortcuts cover ~80% of actions. Good, not exhaustive.

Auditor asks for RBAC change history

Radar
k9s

No record. Reconstruct from git if you GitOps your RBAC.

Radar

Filter audit log by RBAC event type (Cloud retention). Export CSV.

Score: k9s 2, Radar 4.

Use both

The pattern most SREs we talk to settle on.

  • k9s on the laptop for power-user debugging

    Kill a pod, tail logs, exec into a container - anything muscle-memory-driven on one cluster.

  • Radar for shared team state

    Incident channels, PM questions, on-call rotation, post-mortems - anything that benefits from a shared URL or history.

  • Same cluster, no conflict

    Radar runs in-cluster as its own ServiceAccount. k9s talks to the K8s API via your kubeconfig. Both work side by side.

FAQ

Questions we get about k9s.

Isn't k9s enough for small teams?
For 2-3 engineers and 1-2 clusters, k9s + Slack is a perfectly reasonable setup. The Radar case gets stronger around cluster #3 and teammate #4 - when the cost of tab-switching, context-recreation, and kubeconfig-sharing starts mattering.
Can I use k9s and Radar together?
Yes - Radar runs as its own in-cluster ServiceAccount; k9s talks to the K8s API via your kubeconfig. They don't conflict.
Does Radar have k9s-style keyboard shortcuts?
j/k navigate, / search, g jumps to a resource, : for command mode. The UI is web, but the muscle memory is k9s/vim shape. About 80% of actions have a shortcut - good, not as exhaustive as k9s.
Is Radar open source like k9s?
Radar OSS is Apache 2.0 - same license as k9s. The hosted Radar Cloud control plane is proprietary SaaS; that's where the commercial line sits. The split is documented at /open-source.
Does k9s work with every cluster type?
Yes - k9s talks to any Kubernetes API (EKS, GKE, AKS, on-prem, k3s, kind, minikube). Radar works with all of these too, since it's also just a Kubernetes client.

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Hub of every tool we've compared

Keep k9s. Add Radar for what your team shares.

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