Everything you need for
Kafka Streams.

Process Your First Event Easily

From design doc to deploy, Responsive makes Kafka Streams more accessible by automatically sizing your applications, handling observability, and providing access to experts for support.

...And Your Next Trillion Confidently

Responsive separates storage and compute to enable seamless autoscaling of mission-critical Kafka Streams applications at terabyte scale with a robust 99.99% uptime guarantee.

Apache Kafka has revolutionized application development by enabling the shift from synchronous, tightly coupled systems to decoupled applications connected by a durable log. The event-driven revolution is gaining momentum, with companies like BlackRock, Michelin, Salesforce and many more leveraging event-driven architectures at scale.

More often than not developers pick Kafka Streams as a starting point for these applications for its simple, flexible, and powerful APIs combined with a form factor that seamlessly integrates into any stack. If you're building applications on Apache Kafka, Kafka Streams is the best foundation available today.

However, the simplicity of Kafka Streams hides challenges that developers must eventually surmount, such as tuning rebalances, managing state, monitoring the right metrics, and more. We created Responsive to own those complexities while keeping everything else you love about Kafka Streams the same. If you are building applications with Kafka Streams, Responsive is your best friend.

Architecture

Responsive Unbundles Kafka Streams

Kafka Streams' superpower is offering powerful stateful event processing APIs in the form of a library. That is also its kryptonite: since it's a library, the application developer has to own all the underlying subsystems.

Responsive splits out the complex parts of Kafka Streams while retaining the same APIs and form factor.

Our core innovation allows Responsive to separate storage and compute in Kafka Streams.

Observability comes out of the box so you don't need to wade through hundreds of metrics.

Size too small? Risk an outage. Size too large? Waste money. Responsive picks the perfect size for you.

Never fear rebalances, Responsive has that under control.

Kafka Streams, Completed

Why Responsive is the perfect complement for Kafka Streams.

99.99% Uptime.
0% Pain.

Autoscaling and Autotuning

With custom metrics and configurable policies, Responsive takes care of finding the right storage and compute capacity for your application based on real time data. You will never again be caught out by traffic surges, and you won't break bank by overprovisioning either!

Separate Storage from Compute

With Responsive, state is delegated to battle hardened databases, separate from your application. You no longer have to solve the problems of running a distributed database while operating your Kakfa Streams application!

Infinite Scalability

Conventional limitations with scalability are lifted with Responsive: keys in a single partition can be processed concurrently thanks to our Async operator. This means you can scale Kafka Streams in exactly the necessary dimensions for your workload.

Expert Support Within the Hour

We have solved most of the issues that page your developers at 3AM, but when your systems are down our team of experts with over two decades of Kafka Streams experience will be right there with you.

Secure & Compliant

SOC II compliance, annual penetration tests, BYOC, and the ability to bring your own store means your data never leaves your network. Your CISO will love us.

Avoid Mistakes.
Save Years of Work.

Functional Observability

Responsive provides the most useful Kafka Streams metrics through a metrics API and a dashboard out of the box. Don't sort through 100's of metrics, we do it for you.

Fire and Forget Deployments

Just build your application and deploy it. Responsive will take care of finding the right sizing and tuning to keep it running based on runtime characteristics.

One Line of Code Onboarding

Since Responsive is 100% compatible with Open Source Kafka Streams you can onboard without lifting a finger.

Works With Your Existing Kafka Provider

Take Kafka Streams to New Heights

Async Processing

Data Patching

State Store TTL

Store Querying

Kafka Streams OSS Compatible

And More...

Learn about how Metronome delivers advanced usage-based billing with Responsive.

To ingest, process and serve over tens of thousands of billing events per second with strict transactional guarantees, Metronome designed their event-driven architecture using Responsive and Kafka Streams.

Responsive is built by top developers on the Apache Kafka Streams project, the premier stream processing technology

Featured Blog Posts

Defense Against the Dark Arts of Rebalancing in Kafka Streams

For everyone who is in too deep and wants to peel back the curtains on one of the most elegant yet maddening aspects of Apache Kafka: the consumer group rebalancing protocol.

November 15, 2023

S@Sophie Blee-Goldman

Don't Panic: The Definitive Guide to Kafka Streams State

A definitive guide to managing Kafka Streams state that covers some history, architecture concepts and many tips to prevent panic in the face of long restoration and rebalances.

October 04, 2023

A@Almog Gavra

Enter the Matrix: A practical guide to exactly-once semantics in Kafka Streams

A practical guide for developers building stateful Kafka Streams applications with exactly-once semantics enabled. It covers how exactly-once semantics work, how to tune your transactions, and how to solve common issues with the exactly-once system.

April 11, 2024

A@Apurva Mehta

S@Sophie Blee-Goldman

Everything you need forKafka Streams.

Everything you need for
Kafka Streams.