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flannel vs k3s

flannel and k3s share 5 technologies: net/http, etcd, k8s.io/klog/v2, github.com/Microsoft/hcsshim, and github.com/coreos/go-systemd/v22. Both are written in Go.

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What they share and what sets them apart

flannel-io

flannel

flannel is a network fabric for containers, designed for Kubernetes

Go9.6kRead on November 14, 2026, at commit dc074a9What is flannel built with?

Only in flannel

  • github.com/containernetworking/plugins
  • github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/common

In common

k3s-io

k3s

Lightweight Kubernetes

Go34.4kRead on November 14, 2026, at commit c55a7dfWhat is k3s built with?

Only in k3s

  • github.com/k3s-io/kine
  • github.com/ipfs/go-ds-leveldb
  • MinIO
  • Rancher
  • k8s.io/apiserver
  • github.com/sirupsen/logrus
  • containerd
  • Kubernetes
  • github.com/rancher/wharfie
  • k8s.io/cloud-provider
  • Prometheus
  • github.com/go-logr/logr
  • k8s.io/cluster-bootstrap
  • github.com/containerd/fuse-overlayfs-snapshotter/v2
  • github.com/containerd/stargz-snapshotter
  • github.com/pdtpartners/nix-snapshotter
  • k8s.io/kubelet
  • Docker
  • github.com/natefinch/lumberjack
  • go.uber.org/zap
  • github.com/cloudnativelabs/kube-router/v2
  • github.com/containerd/zfs/v2
  • github.com/flannel-io/flannel
  • github.com/google/cadvisor/lib
  • github.com/ipfs/go-log/v2
  • github.com/Mirantis/cri-dockerd

Side by side

SizeLines written by people and agents, without generated ones; code files, without tests.
flannel19,318 lines written68 code files
k3s61,452 lines written244 code files
Who writes itA commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
flannel1.8% of its commits signed by AIWith GitHub Copilot and Claude Code
k3s0.1% of its commits signed by AIWith Claude Code
ActivityFrom GitHub and its history, on the day SeeRepo read it.
flannelLast push November 9, 20261,325 commits9,568 stars
k3sLast push November 14, 20263,677 commits34,402 stars
TestsThe files that test the code, and the share of code files a test imports.
flannel38 test files41.2% of its code files have a test that imports them
k3s107 test files33.2% of its code files have a test that imports them

Frequently asked questions

Which is bigger, flannel or k3s?
k3s, with 61,452 lines written; flannel has 19,318.

The proof: k3s-io/k3s's code at commit c55a7df

Which has more GitHub stars, flannel or k3s?
k3s, with 34,402 stars; flannel has 9,568.

The proof: k3s-io/k3s on GitHub

Which has more tests, flannel or k3s?
k3s, with 107 test files; flannel has 38.

The proof: k3s-io/k3s's code at commit c55a7df

Which was updated more recently, flannel or k3s?
k3s: its last push was on November 14, 2026, and flannel's on November 9, 2026.

The proof: k3s-io/k3s's commits on GitHub

Which has more commits signed by AI, flannel or k3s?
flannel: an AI signed 1.8% of its commits, with GitHub Copilot and Claude Code; in k3s, 0.1%.

The proof: the commits each tool signed in flannel-io/flannel

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