compare / k9s
Klustr vs k9s: a desktop companion to the terminal UI
k9s is the terminal UI many operators live in: fast, keyboard-driven, free under Apache-2.0 and extensible through plugins and hotkeys. Klustr is not trying to replace it. It is a desktop client for the parts of cluster work that benefit from a second dimension: many clusters at once, status tables you can scan, diffs, and drill-downs across resource kinds.
Facts about k9s come from its README and documentation and were reviewed on 2026-10-16. Corrections are welcome as an issue.
At a glance
| Criterion | Klustr | k9s |
|---|---|---|
| The project | ||
| License and price | Apache-2.0, free | Apache-2.0, free |
| Runtime | Go + OS webviewWails, no bundled browser | Go terminal UI |
| Platforms | macOS, Linux, WindowsWindows build not code-signed | macOS, Linux, Windows |
| What it needs from your cluster | ||
| Installed in the cluster | NothingOptional one-click metrics-server, removable from Klustr | Nothing |
| Account or sign-in | NoneYour kubeconfig is the only credential | None |
| Working across clusters | ||
| Several clusters at once | Aggregated tableTwo or more contexts in one list, named groups, color tags | One context at a timeSwitch with :ctx |
| RBAC | Access Review matrixSubject to effective permissions with the binding chain | RBAC and policy viewsReverse lookup for a user, group or ServiceAccount |
| Platform tooling | ||
| Helm | Built inInstall, upgrade, rollback, uninstall with a dry-run diff; repo search | Release viewValues, history and rollback; no install or upgrade |
| Argo CD and Flux | Built in, through the APISync, refresh, reconcile, suspend; no CLIs | Community pluginsSync, refresh, reconcile, suspend; Flux needs the flux CLI |
| Tekton | Typed viewsPipelineRun task table, step logs, cancel and rerun; no tkn | Generic CRDs |
| Gateway API | Typed viewsListeners, rule matrix, RouteParentStatus | Generic CRDs |
| Istio | Typed viewsVirtualServices, DestinationRules, PeerAuthentications | Generic CRDs |
| Cilium | Typed viewsPolicies as rule tables, endpoints, IP pools, BGP | Generic CRDs |
| cert-manager | Typed viewsIssuance chain and one-click renew | Community pluginStatus and renew through cmctl |
| Kyverno | Typed viewsPolicies, exceptions, policy reports and each policy’s violations | Generic CRDs |
| Karpenter | Typed viewsNodePools against their limits, NodeClaims, EC2NodeClasses | Community pluginJumps between NodePools, NodeClaims and Nodes |
| KEDA | Triggers on the HPAScaledObjects stay in the generic CRD browser | Community pluginPause and resume ScaledObjects |
| Day-to-day operations | ||
| Logs | Multi-pod streamPer-pod colors, follow, regex, save | Per pod or workloadAggregated for a deployment, filters |
| Shell access | Exec, debug container, node shell | Pod and node shellNode shell behind a feature gate |
| Local terminal | Drawer per contextKUBECONFIG preset to the active context | Is the terminal |
Where Klustr is different
- Several contexts in one table. k9s works in one context and switches with
:ctx. Klustr aggregates two or more contexts into one list with a Context column, saved groups and a color stripe that tells you which environment you are touching. - Typed views for platform tooling. Argo CD Applications, Flux reconcilers, Tekton runs, Gateway API routes and cert-manager chains render as tables with status pills and actions. In k9s they are generic custom resources, with community plugins adding actions for some of them.
- Diffs before changes. Helm upgrades show a dry-run diff, YAML edits show a server-side dry-run diff, and rollout history shows a side-by-side template diff before you roll back.
- Access Review. k9s can reverse-look-up what a subject may do. Klustr renders the answer as a resource-by-verb matrix with the binding and role behind every cell, live across every active context.
- k9s stays one keystroke away. The built-in terminal drawer opens a local shell with KUBECONFIG already set to the active context, so
k9s,kubectlandsternrun against the right cluster without any setup.
Where k9s is stronger
- Keyboard speed. For an operator who knows the shortcuts, nothing beats k9s for moving through a single cluster.
- Works over SSH. k9s runs anywhere a terminal does, including a bastion host. Klustr is a desktop app.
- Plugins and hotkeys. k9s is scriptable: custom commands, plugins and skins with a small config file.
- Footprint. k9s is a single small binary.
Which one to pick
Keep k9s for fast single-cluster navigation and remote sessions. Add Klustr when you need several clusters in one view, typed GitOps and Gateway API status, or a diff before you change something.
Try Klustr with your own kubeconfig
Free, Apache-2.0 licensed, nothing installed in the cluster.