Istio vs Zuul: What are the differences?
Istio: Open platform to connect, manage, and secure microservices, by Google, IBM, and Lyft. Istio is an open platform for providing a uniform way to integrate microservices, manage traffic flow across microservices, enforce policies and aggregate telemetry data. Istio's control plane provides an abstraction layer over the underlying cluster management platform, such as Kubernetes, Mesos, etc; Zuul: An edge service that provides dynamic routing, monitoring, resiliency, security, and more. It is the front door for all requests from devices and websites to the backend of the Netflix streaming application. As an edge service application, It is built to enable dynamic routing, monitoring, resiliency, and security. Routing is an integral part of a microservice architecture.
Istio and Zuul can be categorized as "Microservices" tools.
Istio is an open source tool with 18.9K GitHub stars and 3.21K GitHub forks. Here's a link to Istio's open source repository on GitHub.
According to the StackShare community, Istio has a broader approval, being mentioned in 51 company stacks & 116 developers stacks; compared to Zuul, which is listed in 10 company stacks and 8 developer stacks.