Best Submariner Alternatives in 2026
The top Submariner alternatives are Cilium, Calico Open Source and Antrea: 15 container networking software our editors would look at instead of Submariner, in our ranking order.
Submariner: A free open-source layer for connecting Pods and Services across Kubernetes clusters. Where it falls short: delivered as self-hosted open-source software.
Switching from Submariner? For most container networking software buyers the best Submariner alternative is Cilium, built for broad Kubernetes networking and observability.
Why People Look for a Submariner Alternative
- Delivered as self-hosted open-source software
- Does not provide explicit support for NetworkPolicy objects
- Optional VXLAN tunnels are unencrypted
- No cNI plugin — 9 of the alternatives below have it
- No network policies — 9 of the alternatives below have it
Quick Picks by What You Need
- Best overallCilium9.4
Broad Kubernetes networking and observability
Visit Cilium - Best free optionCilium9.4
Has a free plan
Visit Cilium - Best for cni pluginCalico Open Source9.2
CNI plugin (Submariner: no)
Visit Calico Open Source
All 15 Submariner Alternatives, Ranked
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
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Best forBroad Kubernetes networking and observability
- Better than Submariner:
- Editor score 9.4 vs 7.7
A broad open-source networking and observability layer for Kubernetes environments.
9.4/10★★★★★Visit Cilium -
Best forFree, full-featured Kubernetes networking
- Better than Submariner:
- CNI plugin
- Network policies
- Editor score 9.2 vs 7.7
A free, broad Kubernetes networking stack with policy, encryption, and multi-cluster support.
- Multi-cluster networking
- Encryption in transit
- Egress control
9.2/10★★★★★Visit Calico -
Best forAdvanced policy and multi-cluster networking
- Better than Submariner:
- Editor score 9.0 vs 7.7
A strong open-source choice for advanced Kubernetes networking, policy, and visibility.
9.0/10★★★★☆Visit Antrea -
Best forFeature-rich Linux and Windows clusters
- Better than Submariner:
- CNI plugin
- Network policies
- Editor score 8.8 vs 7.7
A feature-rich, free CNI for Kubernetes clusters spanning Linux and Windows.
- Encryption in transit
- Egress control
- CNI plugin
8.8/10★★★★☆Visit OVN-Kubernetes -
Best forMulti-tenant Kubernetes and VM networking
- Better than Submariner:
- Editor score 8.6 vs 7.7
A broad self-hosted CNI for multi-tenant Kubernetes and KubeVirt networking.
8.6/10★★★★☆Visit Kube-OVN -
Best forEnterprise Kubernetes security and networking
- Better than Submariner:
- Editor score 8.5 vs 7.7
A broad Kubernetes networking and security suite for enterprises operating complex clusters.
8.5/10★★★★☆Visit Tigera -
Best forEnterprise Cilium networking for self-hosted clusters
- Better than Submariner:
- Editor score 8.4 vs 7.7
A self-hosted Cilium platform for policy-controlled Kubernetes networking and visibility.
8.4/10★★★★☆Visit Cisco -
Best forAmazon EKS and native AWS networking
- Better than Submariner:
- CNI plugin
- Network policies
- Editor score 8.2 vs 7.7
A native AWS networking plugin for Kubernetes clusters running on Amazon infrastructure.
- Egress control
- CNI plugin
- Network policies
8.2/10★★★★☆Visit Amazon VPC CNI -
Best forAzure Kubernetes Service networking
- Better than Submariner:
- CNI plugin
- Network policies
- Editor score 8.1 vs 7.7
A free, open-source CNI for flexible AKS networking and policy control.
- Encryption in transit
- Egress control
- CNI plugin
8.1/10★★★★☆Visit Azure CNI -
Best forBGP-based Kubernetes networking
- Better than Submariner:
- CNI plugin
- Network policies
- Editor score 8.0 vs 7.7
A broad open-source Kubernetes networking stack for BGP-based cluster designs.
- Egress control
- CNI plugin
- Network policies
8.0/10★★★★☆Visit Kube-router -
Best forStraightforward Kubernetes cluster networking
- Better than Submariner:
- CNI plugin
- Network policies
- Editor score 7.9 vs 7.7
A free, focused CNI for straightforward Kubernetes cluster networking.
- Encryption in transit
- CNI plugin
- Network policies
7.9/10★★★★☆Visit Flannel -
Best forComplex multi-interface IPAM environments
- Better than Submariner:
- CNI plugin
- Network policies
- Editor score 7.8 vs 7.7
A broad Kubernetes networking layer for complex multi-interface and RDMA environments.
- Multi-cluster networking
- Encryption in transit
- Egress control
7.8/10★★★★☆Visit Spiderpool -
Best forVMware-centered Kubernetes networking
- Better than Submariner:
- CNI plugin
- Network policies
A VMware-focused Kubernetes networking layer with policy, visibility, and troubleshooting controls.
- Multi-cluster networking
- Egress control
- CNI plugin
7.6/10★★★★☆Visit Broadcom -
Best forManaged multicloud Kubernetes traffic governance
- Better than Submariner:
- Network policies
Centralized multicloud Kubernetes traffic governance without replacing the CNI.
- Multi-cluster networking
- Egress control
- Network policies
7.5/10★★★★☆Visit Aviatrix -
Best forMulti-interface Linux Kubernetes networking
- Better than Submariner:
- CNI plugin
A focused, free open-source choice for complex Pod networking on Linux.
- CNI plugin
7.4/10★★★★☆Visit DANM
Submariner Alternatives: Common Questions
What is the best alternative to Submariner?
Cilium: #1 in our Container Networking Software ranking, with an editor score of 9.4 out of 10. A broad open-source networking and observability layer for Kubernetes environments.
Is there a free alternative to Submariner?
Yes. Cilium, Calico Open Source, Antrea, OVN-Kubernetes and Kube-OVN have a free plan or a free tier (11 of the 15 alternatives on this page).
Why do people look for Submariner alternatives?
Delivered as self-hosted open-source software; Does not provide explicit support for NetworkPolicy objects; Optional VXLAN tunnels are unencrypted.
How do I switch from Submariner?
Export your data from Submariner (most tools have an export in their settings). Sign up for the alternative; start on its free plan or trial if it has one. Import your export and set up the integrations your team relies on. Run both side by side for a short while, then cancel Submariner.
How to Switch from Submariner
- Export your data from Submariner (most tools have an export in their settings).
- Sign up for the alternative; start on its free plan or trial if it has one.
- Import your export and set up the integrations your team relies on.
- Run both side by side for a short while, then cancel Submariner.
Submariner vs Each Alternative
| # | Tool | Free plan | Paid from | CNI plugin | Network policies | Egress control | Score |
|---|---|---|---|---|---|---|---|
| 13 | Submariner | Yes | Free | No | No | Yes | 7.7 |
| 1 | Cilium | Free | 9.4 | ||||
| 2 | Calico Open Source | Yes | Free | Yes | Yes | Yes | 9.2 |
| 3 | Antrea | Free | 9.0 | ||||
| 4 | OVN-Kubernetes | Yes | Free | Yes | Yes | Yes | 8.8 |
| 5 | Kube-OVN | Yes | Free | 8.6 | |||
| 6 | Calico Enterprise | No | 8.5 | ||||
| 7 | Isovalent Enterprise for Cilium | 8.4 | |||||
| 8 | Amazon VPC CNI | Free | Yes | Yes | Yes | 8.2 | |
| 9 | Azure CNI | Yes | Free | Yes | Yes | Yes | 8.1 |
| 10 | Kube-router | Free | Yes | Yes | Yes | 8.0 | |
| 11 | Flannel | Yes | Free | Yes | Yes | 7.9 | |
| 12 | Spiderpool | Free | Yes | Yes | Yes | 7.8 | |
| 13 | VMware NSX Container Plugin | Yes | Yes | Yes | 7.6 | ||
| 14 | Aviatrix Kubernetes Firewall | No | No | Yes | Yes | 7.5 | |
| 15 | DANM | Yes | Free | Yes | 7.4 |
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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