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Kafka Is Fun

Interactive Kafka playground — free, in your browser

Master Kafka by breaking it.

Watch a live cluster think. Crash its brokers. Heal it. From your first partition to production architecture — one guided journey, zero setup.

Break your first cluster Start learning
learning modules
9learning modules
interview questions
150interview questions
installs required
0installs required

What brings you to Kafka?

It only changes what we suggest first. Switch any time.

Prefer to see it?Open a live Kafka cluster in 3D: leaders, replicas and consumers, with records moving between them as you send, crash and heal.Open the 3D viewWant Kafka running on your own machine?Install Kafka, start a KRaft broker (no ZooKeeper), create a topic and send your first message, step by step.Open the setup guideHit an error in production?Look it up by its message. 12 common Kafka errors, each with what it means, the likely causes in order and how to confirm and fix each one.Troubleshoot an error

Where do you want to start?

Four ways in, one platform. Every path connects to the others.

Learn9 structured modules from fundamentals to what changed in Kafka 4.x, plus the full Spring Boot path — every lesson with analogies, real configs and a knowledge check.
Practice150 interview questions with keyword-based answer evaluation and a self-rating that tracks what to revisit, plus hands-on labs that run against the live simulator.
SimulateA visual Kafka cluster you can break: crash brokers, partition the network, poison messages — then watch it heal and understand why.
DesignThe architecture planner: size partitions, brokers, storage and network for your real workload — with the reasoning shown.
Search everythingLessons, scenarios, questions, labs, failures — one search across it all.

Why it finally clicks here

See it, don't memorise it

Leader election, ISR shrink, rebalances — every cause paired with its visible effect, live on screen.

One path, not eight tabs

Understand → observe → experiment → implement → diagnose → design. Each section picks up where the last one ends.

Production-grade, zero setup

Real spring-kafka recipes, failure drills and sizing math — all in your browser. Nothing to install, ever.

Break it. Watch it heal. Master it.

The best Kafka engineers learned from incidents. Here, you get the incidents without the pager.

Open the simulator