KurrentDB is the database for distributed systemsintelligent systemsresponsive systems

Modular architectures that scale without complexity

Agentic applications that learn and adapt

Real-time experiences that keep pace with your business

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Why developers choose KurrentDB

Build Faster

Accelerate product development cycles by 30-50%

Evolve Freely

Iterate and adapt without downtime or costly migrations

See Everything

Understand not just what happened but how and why it led to outcomes

Sync Anything

Deliver the right data to the right place, in real time

50M+

DOWNLOADS

5M

CLIENT LIBRARY DOWNLOADS

10K

COMPANIES USING KURRENT

350+

CUSTOMERS

The KurrentDB difference.

Only KurrentDB Delivers

Complete data preservation

Built-in audit and traceability

Replay and time-travel

Data products in any shape

Change without refactoring

Integrated data movement

Time to rethink the data model

Stop losing context. Move beyond the limitations of traditional state-based databases.

CRUD Can’t

Kurrent Can

Loses data with every update and delete

Remember

Preserves your complete history

Can’t tell you how it got to where it is

Explain

Gives you the full story — every change, with context

Requires time-consuming and risky schema changes

Evolve

Projects the same source data into any new shape

Current state only, unless you build workarounds

Roll back

Replay, rewind or rebuild to any moment

Makes you build audit logs as an afterthought

Prove

IS the audit log

Poll for changes, implement triggers, or bolt on CDC

Communicate

Streams changes natively in real time

Remember

Loses data with every update and delete

Preserves your complete history

Explain

Can’t tell you how it got to where it is

Gives you the full story — every change, with context

Evolve

Requires time-consuming and risky schema changes

Projects the same source data into any new shape

Roll back

Current state only, unless you build workarounds

Replay, rewind or rebuild to any moment

Prove

Makes you build audit logs as an afterthought

IS the audit log

Communicate

Poll for changes, implement triggers, or bolt on CDC

Streams changes natively in real time

How KurrentDB Works

Transformative capabilities through event sourcing and CQRS

Global event ordering

Immutable, globally ordered log providing chronological sequencing across all events

Fine-grained streams

Scale to billions of independent entity streams, each instantly accessible with complete history

Sophisticated indexing

Individually indexed streams enable direct access without scanning unrelated data

Built-in causality

Event correlation and causation IDs preserve relationships within and across streams

Projection engine

Process, transform and semantically link events in real-time directly within the database

Integrated pub/sub

Powers real-time event flows and automates message delivery out-of-the-box

How It Works

KurrentDB's event-native data model

KurrentDB stores events in fine-grained streams with unique keys per stream—scalable to billions of streams without data duplication. Each event captures time as a key element, enabling global ordering across streams and intra-stream causation. Every append triggers a new stream version for optimistic concurrency, ensuring durable writes of atomic events with unique identification within and across streams.