Krust and K9r vs k9s

k9s is a mature terminal UI with a loyal following. Krust is a native macOS GUI built on a Rust core. K9r is Krust's terminal surface, included with Krust v1.4.3, for operators who want k9s-style keyboard flow while reusing Krust's Kubernetes engine.

This page compares workflow model: native GUI, Krust-powered terminal, and k9s. If you are deciding across multiple GUI tools, start with the broader Kubernetes dashboard alternative guide.

Official project reference: k9s on GitHub.

Quick Comparison

Where K9r Fits

K9r exists for the overlap between Krust and k9s: terminal-first operation, but backed by Krust's shared Rust runtime. It is packaged with the Krust cask, so one install gives you both the native app and the k9r command.

brew install --cask vanchonlee/tap/krust
k9r

Use K9r when you want context and namespace pickers, resource tables, pod-to-container-to-logs drill-down, YAML/edit flows, shell/attach, safe confirmations, and k9s-compatible hotkeys inside a terminal. Use Krust when visual topology, multi-window workflows, and native macOS interactions matter more.

Where Krust Excels

Visual overview without memorizing commands

Krust gives you a full graphical interface with sortable tables, drag-and-drop, right-click context menus, and a command palette (Cmd+K). You can see resource status at a glance without typing a single keystroke. For teams onboarding new engineers or for operators who manage clusters infrequently, the learning curve is significantly lower.

Resource topology graph

Select any Deployment, StatefulSet, or Service and Krust renders an interactive tree of related resources — ReplicaSets, Pods, ConfigMaps, Secrets, PVCs, and more. This visual map makes it easy to understand how resources connect, which is difficult to piece together from text output alone.

Side-by-side multi-cluster

Krust can connect to multiple clusters simultaneously and display them in the same window. Compare staging and production resources side by side, or monitor several clusters at once. k9s works with one context at a time, so you would need multiple terminal windows and manual switching.

Advanced log viewer

Krust's log viewer supports full-text search across a 100K-line buffer, log level coloring, regex filtering, bookmarks for important lines, and export to file. Pro is reserved for incident workflows: multi-pod log aggregation and deeper history search. Structured JSON/logfmt parsing stays free in Krust. k9s provides log tailing with basic filtering, which covers simple cases but can fall short during complex debugging sessions.

Built-in terminal emulator

When you exec into a pod, Krust opens a native terminal emulator inside the app with full TTY support. It automatically detects available shells (bash, ash, sh) using a single WebSocket connection. k9s keeps this workflow in the terminal, which is ideal for terminal-first users but separate from Krust's single-window GUI workflow.

YAML editor with diff

Krust includes a syntax-highlighted YAML editor that shows a diff of your changes before applying them. You can open multiple editor windows for different resources. k9s delegates editing to your $EDITOR, which is flexible if you have a preferred editor but lacks the integrated diff experience.

Port forwarding with persistence

Set up port forwards with one click, bookmark them for reuse, and let Krust auto-reconnect if the pod restarts. You can optionally auto-open the browser when a forward starts. k9s supports port forwarding but without the bookmark or auto-reconnect workflow.

Helm rollback UI

View all Helm releases, browse revision history, inspect values YAML, and roll back to any revision — all from the GUI. k9s can integrate with Helm via plugins, but the experience is less integrated.

Visual metrics

CPU and memory usage are displayed as visual gauges at both the pod and workload level, updated every 30 seconds from the metrics-server API. k9s shows metrics as text columns, which is functional but less scannable at a glance.

macOS integration

Krust delivers native macOS notifications for Kubernetes events, watches your kubeconfig for changes automatically, and follows macOS design conventions. It feels like a first-party Apple app rather than a cross-platform tool.

Where k9s Excels

k9s Is Free and Open Source

k9s is 100% free under the Apache 2.0 license. There is no paid tier, no feature gating, and no vendor lock-in. The source code is on GitHub and accepts community contributions. If cost is a primary concern, k9s is hard to beat.

Cross-platform

k9s runs on macOS, Linux, and Windows. Krust is macOS-only. If your team uses mixed operating systems, k9s is the tool everyone can standardize on.

Works over SSH

Because k9s is a terminal application, you can use it on remote servers over SSH. This is valuable for managing clusters from jump boxes, bastion hosts, or CI/CD environments. Krust requires a desktop with a display.

Speed for power users

k9s uses Vim-style navigation with single-key commands. Experienced users can navigate resources, filter, describe, and delete without touching a mouse. If you already think in Vim keybindings, k9s can feel faster than any GUI. Krust supports keyboard shortcuts (including k9s-style single-key shortcuts), but the GUI interaction model is inherently different.

Lower resource usage

k9s can be very lightweight in simple terminal sessions. In high-load workflows with many active views and streams, usage can increase significantly. Krust's GUI and real-time watchers generally have a higher baseline, while trading for stronger visual workflow integration.

Plugin system

k9s supports custom plugins that let you extend its functionality with shell commands. You can add context-specific actions for any resource type. Krust does not currently offer a plugin system.

Popeye integration

k9s integrates with Popeye, a cluster sanitizer that scans for potential issues and misconfigurations. This gives k9s a built-in cluster health check that Krust does not replicate (though Krust's AI diagnostic agent covers some of the same ground).

Lightweight and dependency-free

k9s is a single binary with no GUI framework dependencies. It installs via Homebrew, snap, or a direct download, and runs anywhere a terminal exists. Krust requires macOS 14+ and a full application bundle.

Using Both Together

A common workflow:

• Use Krust's multi-cluster view to monitor staging and production side by side throughout the day
• Use Krust's topology graph and log viewer when debugging an incident
• Use K9r for local terminal workflows that should reuse Krust's hot cache, logs, YAML, and action plumbing
• Use k9s when SSH'd into a bastion host or working in a pure terminal environment
• Use k9s for quick, muscle-memory operations when you know exactly what you need

Decision Framework

• Choose Krust first when your bottleneck is incident clarity, visual context, and multi-cluster comparison.
• Choose K9r first when you want k9s-style terminal flow but prefer Krust's shared runtime and packaged macOS distribution.
• Choose k9s first when your bottleneck is remote SSH operations and keyboard-only speed.
• Use both when your team spans GUI-oriented developers and terminal-heavy SRE workflows.

Who Should Choose Krust

• Teams that want a visual overview of their clusters without terminal complexity
• Engineers who prefer GUI tools and mouse-driven workflows
• Operators managing multiple clusters who need side-by-side comparison
• Anyone who spends significant time reading logs and wants search, bookmarks, and export
• macOS users who value native app design and system integration

Who Should Choose K9r

• macOS users who want k9s-style terminal navigation but prefer installing Krust and K9r together
• Operators who want terminal resource tables backed by Krust's shared Kubernetes runtime
• Teams already using Krust that also want a keyboard-first terminal flow for pods, logs, YAML, and safe actions
• Users who want a local terminal experience rather than an SSH/bastion-first workflow

Who Should Choose k9s

• Terminal power users who are fastest with Vim-style navigation
• Teams on Linux or Windows who need a cross-platform tool
• Engineers who work primarily over SSH
• Users who want a completely free, open-source solution
• Environments where minimal resource usage matters

Get Started with Krust

If you are a k9s user curious about a GUI approach, Krust's free tier covers resource browsing, terminal exec, log viewing, Helm, YAML editing, metrics, and multi-cluster. You can try it without commitment and keep using k9s alongside it.