Apache Flink
What is a Flink UI? The complete guide
A Flink UI is the graphical face of your Apache Flink cluster — but not all Flink UIs are equal. Here's what exists, what each one does, and how to choose.
If you manage Apache Flink clusters, you have probably searched for a "Flink UI", "Flink dashboard", or "Flink GUI" — and found a confusing mix of built-in dashboards, CLI tools, and commercial consoles. This guide explains every option.
What is a Flink UI?
A Flink UI is a web interface for an Apache Flink cluster. It replaces hand-crafted REST calls to the JobManager with a browser view of your cluster: running jobs, task managers, checkpoints, backpressure, and logs. A good Flink UI does more than display — it lets you act: submit jobs, run SQL, scale clusters, and configure scheduling.
Apache Flink's built-in web UI
Apache Flink ships with an open-source web dashboard served by the JobManager on port 8081 by default. Open http://<jobmanager>:8081 and you get an overview of jobs, task managers, and configuration. It is the fastest way to see what is happening — but it is mostly read-only: you cannot run Flink SQL, manage multiple clusters, or set role-based access from it.
What a Flink SQL UI adds
A Flink SQL workbench — or "Flink SQL UI" — takes the next step. Tools like Flink's SQL Client and the SQL Gateway execute SQL against a cluster, but they run in a terminal. A visual SQL workbench lets you write, validate, and run Flink SQL in a browser, then track the resulting job in the same interface.
When you need a production Flink UI
Platform teams that run many Flink clusters in production quickly hit the limits of the stock dashboard:
Multi-cluster views, up-time, role-based access control, schedulers, retention rules, alerting, and an audit trail — the stock dashboard stops where operations begin.
That is the gap Flink UI by Vinteros Labs fills: a management console layered on Apache Flink with Flink SQL, one-click deployment, auto-scaling, RBAC, and enterprise security. You can try it free for 30 days — no credit card required.
Choosing your Flink UI
Start with Flink's built-in dashboard for single-cluster visibility. Add a SQL workbench when you want to author SQL without the terminal. Move to a production console when you need role-based access, multiple clusters, scheduling, and alerting. For a full comparison, see our guide to open-source Flink UI options.