Istio

C tier on Microsegmentation SoftwareScore 6.7 · #5 of 27

Android app: Not listed
Free plan: Yes
Runs on: Linux, Mac, self-hosted

istio.io

Summary

Istio is a free, open-source service mesh for securing, connecting, and monitoring distributed applications with few or no service-code changes. It manages HTTP, gRPC, WebSocket, and TCP traffic with automatic load balancing, routing rules, retries, failovers, and fault injection. Deployment options include sidecars and ambient mode, which uses a per-node Layer 4 proxy and can add a per-namespace Envoy proxy for Layer 7 features. Istio’s control plane runs on Kubernetes, while the mesh can extend to other clusters, virtual machines, and endpoints outside Kubernetes. Security features include workload identity, mutual TLS, authentication, authorization policies, and audit tools. It can produce traffic metrics, logs, and traces, including for ingress and egress. Installation is available through istioctl or Helm. The project documents integrations with tools such as Prometheus, Grafana, Jaeger, Kiali, cert-manager, and SPIRE, and supports Envoy extensions including WebAssembly modules and third-party policy systems. Istio is a graduated Cloud Native Computing Foundation project. Istio 1.31 supports Kubernetes 1.32 through 1.36.

Who it is for

Istio suits teams managing distributed applications on Kubernetes that need traffic control, security, or observability. Its mesh can also cover other clusters, virtual machines, and endpoints outside Kubernetes.

What is good

Free and open source.
Supports sidecar and ambient deployment modes.
Includes mutual TLS and authorization policies.
Can generate traffic metrics, logs, and traces.
Installs with istioctl or Helm.

What to know first

Development builds have no support.
Minor releases have a defined support window.

Verdict

Istio brings traffic management, security, and observability features to distributed applications with minimal or no service-code changes. Consider its release support window when choosing a build.

Istio plans and pricing

All plans

Istio Free Open source service mesh · Releases accessible at no cost istio.io · 29 Sept 2026

Compared on microsegmentation software

Free plan: Yesistio.io

Facts

What it does: Istio is an open source service mesh that adds ways to secure, connect, and monitor distributed applications with few or no service code changes.istio.io · 29 Sept 2026
Traffic management: Istio supports automatic load balancing for HTTP, gRPC, WebSocket, and TCP traffic, plus routing rules, retries, failovers, and fault injection.istio.io · 29 Sept 2026
Deployment modes: Istio supports sidecar mode and ambient mode, which uses a per-node Layer 4 proxy and optionally a per-namespace Envoy proxy for Layer 7 features.istio.io · 29 Sept 2026
Workload environments: Istio’s control plane runs on Kubernetes and the mesh can extend to other clusters, virtual machines, and endpoints outside Kubernetes.istio.io · 29 Sept 2026
Security: Istio security features include workload identity, mutual TLS, authentication, authorization policies, and audit tools.istio.io · 29 Sept 2026
Observability: Istio can generate metrics, logs, and traces for traffic in a cluster, including ingress and egress traffic.istio.io · 29 Sept 2026
Integrations: Istio’s integration documentation covers cert-manager, Grafana, Jaeger, Kiali, Prometheus, SPIRE, Apache SkyWalking, Zipkin, and third-party load balancers.istio.io · 29 Sept 2026
Extensibility: Istio uses Envoy proxies and supports extensions including WebAssembly modules and third-party policy systems.istio.io · 29 Sept 2026
Installation: Istio can be installed with istioctl or Helm, and its release archive includes the istioctl binary, installation profiles, Helm charts, and samples.istio.io · 29 Sept 2026
Supported Kubernetes versions: The Istio 1.31 release supports Kubernetes versions 1.32 through 1.36.istio.io · 29 Sept 2026
Community support: For supported releases, the Istio community provides patch releases for critical issues and technical assistance; partners may offer longer-term support.istio.io · 29 Sept 2026
Release support window: A minor release is supported until six weeks after the N+2 minor release, and development builds have no support.istio.io · 29 Sept 2026
Project status: Istio is a graduated Cloud Native Computing Foundation project.istio.io · 29 Sept 2026