ArgoCD vs Flux: choosing a GitOps engine for Kubernetes.
Both make git the source of truth for your clusters and reconcile drift automatically. The difference is mostly UI, footprint and how you like to operate.
The short answer
ArgoCD if you want a rich UI, app-of-apps patterns and strong multi-team visibility. Flux if you want a lightweight, CLI/GitOps-toolkit approach that composes cleanly and stays out of the way.
Side by side
| Dimension | ArgoCD | Flux |
|---|---|---|
| UI | Full-featured web UI | Minimal; CLI-first |
| Footprint | Heavier | Lightweight controllers |
| Multi-tenancy | Projects, RBAC, app-of-apps | Namespacing + Kustomize |
| Progressive delivery | Argo Rollouts | Flagger |
| Reconciliation | Every few minutes / on change | Every few minutes / on change |
What matters more than the choice
- Repository structure — a clean app/environment layout beats tool features.
- Secrets — pair either with Sealed Secrets, SOPS or External Secrets; never commit plaintext.
- Drift response — both reconcile, but decide whether drift auto-heals or alerts for review.
My take after 16 years
For teams that value visibility and onboarding, ArgoCD — its UI and app-of-apps make multi-service EKS platforms legible. For minimalists who live in the CLI and want the smallest footprint, Flux is elegant. Both give you reconciliation every few minutes; I've run ArgoCD on private-subnet EKS with drift detection as the backbone of zero-finding SOC 2 platforms. Pick the operating style your team will actually maintain.
Building GitOps on EKS?
Hardened EKS with ArgoCD or Flux, drift detection and progressive delivery.
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