What is Istio used for?

Istio extends Kubernetes to establish a programmable, application-aware network, providing traffic management, telemetry, and security for complex deployments. It is a good fit for connecting and securing cloud native workloads, managing traffic and telemetry in complex deployments, and improving application performance through observability.

Is Istio open source?

Yes. Istio is open source under the Apache-2.0 licence. Its source code is on GitHub at istio/istio and is written mainly in Go.

Yes. Istio is open source, so the software itself is free to use. A managed cloud version is also available.

Can I self-host Istio?

Yes. Istio can be self-hosted on your own server or infrastructure.

What is Istio an alternative to?

Istio is an open-source alternative to Illumio. Other open-source alternatives to Illumio include Kubernetes, Consul and Cilium.

Is Istio actively maintained?

Yes. The most recent commit to Istio was on 14 October 2026, and the latest release is 1.31.1, published on 21 September 2026. The project has 38k stars on GitHub.

Istio: open-source alternative to Illumio

About Istio

Istio is a service mesh that extends Kubernetes to create a programmable, application-aware network. It works with both Kubernetes and traditional workloads, bringing standard, universal traffic management, telemetry, and security to complex deployments.

The platform allows users to select features and deploys proxy infrastructure as needed, using a zero-trust tunnel for Layer 4 performance and security, or the Envoy service proxy for Layer 7 features. It is a Cloud Native Computing Foundation graduated project.

Key features

Service-to-service security including mTLS authentication, authorization, and encryption
Deep visibility into applications for observability and performance improvement
Consistent networking management for services without additional developer overhead
Support for ambient mode, now Generally Available
Deployable with or without sidecars
Installable by users, via Kubernetes or cloud provider one-click install, or through fully managed providers

Good fit for

Connecting and securing cloud native workloads
Managing traffic and telemetry in complex deployments
Improving application performance through observability

Built with: Go tools; Kubernetes tools
Tags: service mesh; kubernetes; traffic management; security; observability; telemetry

Istio: questions and answers

What is Istio used for?: Istio extends Kubernetes to establish a programmable, application-aware network, providing traffic management, telemetry, and security for complex deployments. It is a good fit for connecting and securing cloud native workloads, managing traffic and telemetry in complex deployments, and improving application performance through observability.
Is Istio open source?: Yes. Istio is open source under the Apache-2.0 licence. Its source code is on GitHub at istio/istio and is written mainly in Go.
Is Istio free?: Yes. Istio is open source, so the software itself is free to use. A managed cloud version is also available.
Can I self-host Istio?: Yes. Istio can be self-hosted on your own server or infrastructure.
What is Istio an alternative to?: Istio is an open-source alternative to Illumio. Other open-source alternatives to Illumio include Kubernetes, Consul and Cilium.
Is Istio actively maintained?: Yes. The most recent commit to Istio was on 14 October 2026, and the latest release is 1.31.1, published on 21 September 2026. The project has 38k stars on GitHub.