The only database purpose-built for event sourcing.
Stop building an event store from scratch. Start with one that's already complete.
Stop fighting
Immutability, ordering, streaming, and projections are native capabilities—not bolted on like with CRUD databases.
Ship faster
No designing schemas, building subscriptions, or debugging concurrency. Start with a working event store on day one.
Simplify your stack
One purpose-built platform instead of five. Fewer moving parts, fewer failure modes.
50M+
DOWNLOADS
F500
DEPLOYMENTS
μs
LATENCY
99.9%
UPTIME
SOC 2
CERTIFIED
"I feel like I'm battling my database"
When organizations implement event sourcing with general-purpose databases like PostgreSQL, MongoDB, or Cassandra, they quickly discover these databases weren't designed for event-driven patterns. What starts as "we'll just store events in a table" becomes months of custom development across six critical areas.
Schema & Data Model Design
General-purpose databases have no native concept of event streams. Teams design custom schemas from scratch—event tables with aggregate IDs, sequence numbers, and payload columns.
Third-Party Libraries or Custom Code
Without native support, teams adopt third-party libraries or build custom implementations. Either path means your event store is only as reliable as non-core code.
Ordering & Consistency Guarantees
Event sourcing depends on strict ordering—within streams and globally. General-purpose databases don't provide this automatically. Teams must implement sequence generation and handle failures.
Concurrency Control
When multiple processes append events simultaneously, you need optimistic concurrency control. General-purpose databases require custom implementation—error-prone code with silent data corruption as the consequence.
Real-Time Streaming Infrastructure
General-purpose databases offer limited or no native streaming. Teams bolt on external message brokers—doubling operational complexity and creating synchronization challenges.
Projection & Read Model Management
Events need transformation into read models. General-purpose databases require external frameworks, custom microservices, or batch jobs—plus checkpoint management and synchronization logic.
Building an Event Store is a Burden
Specialized Knowledge
Development Time
Ongoing Maintenance
Infrastructure Focus
System Fragility
Tech Debt
A database that's designed to store events
KurrentDB is the database that speaks event sourcing natively. With 12+ years of continuous development and hundreds of production deployments, it delivers native capabilities that eliminate the complexity, performance compromises, and operational overhead of retrofitting traditional databases.
Native Immutable Event Streams
Built-In Global Event Ordering
Multi-Stream Atomic Appends
Native Real-Time Subscriptions
Advanced Projections Engine
Optimistic Concurrency Built-In
Sophisticated Event Indexing
Unlimited Event Retention
Enterprise-Ready & Production-Proven
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.
KurrentDB in an event sourced application
In an event-sourced architecture, commands flow through deciders that determine state changes, which are persisted as events to KurrentDB. The event store serves as the single source of truth, with projections transforming events into read-optimized models for queries. Reactions listen to events and trigger updates to external systems—all with immediate consistency for commands and eventual consistency for projections and reactions.
Plug-and-play vs. infrastructure project
General-purpose databases were designed around CRUD—they assume you'll overwrite data as state changes. Event sourcing requires the opposite: append-only storage where history is never lost. Retrofitting CRUD databases means fighting their core design. KurrentDB was purpose-built for event sourcing, eliminating the complexity tax entirely.
Other DBs
Kurrent
Enforced manually
Immutability
Native
Custom schema
Native Event Streams
Built-in
Custom implementation
Global Event Ordering
Guaranteed
Custom logic
Optimistic Concurrency
Native
Limited or external tools
Real-Time Subscriprions
Native
External tools
Server-Side Projections
Built-in
Varies, often limited
Event Retention
Unlimited + archiving
Complex or unavailable
Multi-Stream Atomicity
Native
Immutability
Enforced manually
Native
Native Event Streams
Custom schema
Built-in
Global Event Ordering
Custom implementation
Guaranteed
Optimistic Concurrency
Custom logic
Native
Real-Time Subscriprions
Limited or external tools
Native
Server-Side Projections
External tools
Built-in
Event Retention
Varies, often limited
Unlimited + archiving
Multi-Stream Atomicity
Complex or unavailable
Native
Deploy Your Way
Choose the deployment model that fits your needs
Kurrent Cloud
Focus on your application while we manage the infrastructure.
Kurrent Enterprise
Run and manage KurrentDB yourself with full control and support.
