Container Tools

5 open source tools compared. Sorted by stars — scroll down for our analysis.

Tool	Stars	Velocity	Language	License	Score
Dive Explore layers in a Docker image	53.6k	—	Go	MIT License	82
Portainer Docker and Kubernetes management UI	37.0k	+81/wk	TypeScript	—	69
Harbor Trusted cloud native container registry	27.8k	+61/wk	Go	Apache License 2.0	79
Dockge Docker compose stack manager	22.6k	+111/wk	TypeScript	MIT License	77
containerd Open container runtime	20.5k	+66/wk	Go	Apache License 2.0	79

Our Analysis

Dive53.6k★

Dive lets you explore Docker image layers and see exactly what each layer adds, removes, or modifies. If your container image ballooned to 2GB and you don't know why, Dive shows you the answer in seconds with an interactive TUI. docker history is the built-in but barely useful alternative. Slim.ai analyzes and optimizes images commercially. Trivy focuses on security scanning, not size analysis. There's really nothing else that does exactly what Dive does in the open source space. If you build Docker images, install Dive. Period. Run dive your-image and immediately see wasted space — cache files left behind, unnecessary build tools, duplicate layers. It's MIT licensed and works on any container runtime. The catch: it's a diagnostic tool, not a fix. Dive tells you the problem but you still have to rewrite your Dockerfile. The TUI can be confusing at first with its layer-by-layer navigation. And it hasn't seen major feature updates recently — it's stable and complete, but don't expect new capabilities.

Portainer37.0k★

Portainer gives Docker a GUI when you're tired of typing `docker ps` for the hundredth time. Point it at your Docker socket or Kubernetes cluster, and you get a web dashboard for managing containers, images, volumes, and networks. It's the fastest way to make self-hosted infrastructure approachable for non-CLI people. For solo founders running a VPS with a handful of containers, Portainer's free Community Edition is genuinely useful. Dockge is lighter if you only care about Compose stacks. Coolify is better if you want full PaaS features. Rancher is the enterprise play for multi-cluster Kubernetes. The catch: Portainer has been quietly moving features behind paid tiers — OIDC, RBAC, and SSO now require a business license. And users report the UI gets sluggish under load, sometimes freezing for minutes. The zlib license is permissive, but the feature gating trend is worth watching.

Harbor is the container registry for teams that need more than Docker Hub. It adds vulnerability scanning, RBAC, image signing, replication between registries, and audit logs on top of basic image storage. CNCF graduated, which means production-proven. If you're running Kubernetes in production and need a private registry with security features, Harbor is the open-source standard. Docker Registry is the barebones alternative — stores images, nothing else. GitLab Container Registry bundles with GitLab's CI/CD. Commercially, ECR, GCR, and ACR are the managed options that eliminate ops burden. The vulnerability scanning integration (via Trivy) catches CVEs before images hit production. Replication lets you mirror images across data centers or cloud regions. The web UI is actually usable for managing repositories and access. The catch: Harbor is a full platform, not a lightweight tool. It needs PostgreSQL, Redis, and several services running. For small teams, the operational overhead might exceed the benefit — especially when your cloud provider's managed registry is a few clicks away. Also, the initial setup and HTTPS certificate configuration trips up many first-time deployers.

Dockge22.6k★

Docker Compose management that doesn't require a PhD in Portainer. Dockge is from the creator of Uptime Kuma, and it shows — clean UI, laser focus, zero bloat. It manages Docker Compose stacks and nothing else, which is exactly what most self-hosters need. Portainer is the comprehensive alternative — Docker, Swarm, Kubernetes, multi-user RBAC. But that breadth means complexity. Yacht and Lazy Docker are other lightweight options but less polished. Docker Desktop is fine for local dev but not for managing a homelab. Dockge's killer feature: stacks are stored as actual docker-compose.yml files on the filesystem, not in an internal database. You can version control them, edit them outside Dockge, and they survive tool changes. Real-time log streaming and a reactive UI make it feel snappy. The catch: Dockge only manages Compose stacks. No individual container management, no Kubernetes, no multi-node orchestration. If you need team access controls or API automation, Portainer is the better choice. And the project is young — expect occasional rough edges and missing features.

containerd20.5k★

containerd is the container runtime you're already using without knowing it. It sits between Docker (or Kubernetes) and the Linux kernel, managing container lifecycle — pulling images, creating containers, managing storage and networking. When Kubernetes dropped Docker as a runtime, containerd is what replaced it. If you're running Kubernetes in production, containerd is likely your runtime already. CRI-O is the main alternative — lighter, built specifically for Kubernetes, and preferred by Red Hat/OpenShift. Docker Engine still wraps containerd underneath for developer machines. Podman is the daemonless alternative for local development. You don't interact with containerd directly unless you're building platform tooling. It's infrastructure's infrastructure. But understanding it matters when you're debugging container issues at the runtime level. The catch: this isn't a tool you "choose" — it's a dependency your orchestrator chooses. If you're evaluating container runtimes for Kubernetes, the real decision is containerd vs CRI-O. For most teams, whichever ships with your Kubernetes distribution is the right answer. Don't overthink it.