whichdb
vs

ClickHouse vs kdb+

ClickHouse: Open-source columnar OLAP database known for very fast aggregations over billions of rows. kdb+: Column-store time-series engine with the q language, a fixture of capital-markets tick data.

key differences

  • ClickHouse is primarily a columnar / OLAP database; kdb+ is time-series.
  • Licensing: ClickHouse is open source (permissive) (Apache License 2.0); kdb+ is proprietary (Commercial; KDB-X Community Edition free with resource limits).
  • ClickHouse is built for larger datasets (Multi-PB) than kdb+ (≤ 1 PB).
  • Horizontal scaling is native in ClickHouse and manual in kdb+.
  • Only ClickHouse has full-text search, vector search, geospatial, materialized views, ttl / expiry.
  • Only kdb+ has stored procedures, pub/sub, in-memory.
  • ClickHouse has a serverless option; kdb+ does not.

choose clickhouse for

  • +Product and web analytics
  • +Log and observability backends
  • +Real-time dashboards over event streams
  • +Time-series and IoT metrics at scale

best at · Real-time analytics, OLAP, Observability

choose kdb-plus for

  • +Equities, FX and futures tick capture
  • +Trade surveillance and best-execution analysis
  • +Quant research on historical market data
  • +Real-time risk and P&L

best at · Tick data, Time-series, Real-time analytics

ClickHouseOpen-source columnar OLAP database known for very fast aggregations over billions of rows.
kdb+Column-store time-series engine with the q language, a fixture of capital-markets tick data.
overview
Primary model
Columnar / OLAP
Time-Series
Also supports
Relational, Document, Vector, Time-Series
Columnar / OLAP, Relational
Type
Database engine
Database engine
Status
Active
Active
Developer
ClickHouse, Inc.
KX
First release
2016
2003
Latest version
26.10.2.103 (Oct 24, 2026)
KDB-X 5.0.20261015 (Oct 15, 2026)
License
Open source (permissive)Apache License 2.0
ProprietaryCommercial; KDB-X Community Edition free with resource limits
Free tier
✓
✓
popularity
WhichDB Score
69.8
31.8
Rank
#10
#75
GitHub stars
50.6K
–
Stack Overflow questions
2.2K
2.3K
scale & guarantees
Comfortable data size
Massive (Multi-PB)
Large (≤ 1 PB)
Horizontal scaling
Native
Manual
Multi-region
Read replicas
None
ACID
Limited
Limited
Consistency
Eventual
Strong
Schema
Strict
Strict
Architecture
Distributed, Shared storage, Single node, Client server
In memory, Single node, Client server
deployment
Self-hosted
✓
✓
Vendor-managed cloud
✓
✓
Serverless
✓
—
Embedded
—
—
Edge
—
—
Clouds
AWS, Google Cloud, Azure, Alibaba Cloud, Tencent Cloud, Aiven
AWS
capabilities
Transactions
—
—
Joins
✓
✓
Secondary indexes
✓
✓
Full-text search
✓
—
Vector search
✓
—
Geospatial
✓
—
JSON
✓
✓
Change data capture
—
—
Triggers
—
—
Stored procedures
—
✓
Materialized views
✓
—
TTL / expiry
✓
—
Pub/Sub
—
✓
Columnar storage
✓
✓
In-memory
—
✓
Durable persistence
✓
✓
Compression
✓
✓
Encryption at rest
✓
✓
Role-based access
✓
—
Time travel
—
—
Branching
—
—
Online schema changes
✓
—
Streaming ingest
✓
✓
Offline sync
—
—
Runs in WebAssembly
—
—
interfaces
Query languages
SQL (ClickHouse dialect), PRQL, KQL (experimental)
q, qSQL, Python (PyKX)
Client languages
Python, Go, Java, JavaScript, Rust, C++, C#
Python, Java, C, C#
Best for
Real-time analytics, OLAP, Observability, Warehouse
Tick data, Time-series, Real-time analytics, Streaming
Add more to this comparisonNot sure either fits? Try smart match

ClickHouse vs kdb+: FAQ

What is the difference between ClickHouse and kdb+?

ClickHouse: Open-source columnar OLAP database known for very fast aggregations over billions of rows. kdb+: Column-store time-series engine with the q language, a fixture of capital-markets tick data. ClickHouse is primarily a columnar / OLAP database; kdb+ is time-series. Licensing: ClickHouse is open source (permissive) (Apache License 2.0); kdb+ is proprietary (Commercial; KDB-X Community Edition free with resource limits). ClickHouse is built for larger datasets (Multi-PB) than kdb+ (≤ 1 PB).

When should I choose ClickHouse over kdb+?

Choose ClickHouse for product and web analytics; log and observability backends; and real-time dashboards over event streams. Choose kdb+ for equities, FX and futures tick capture; trade surveillance and best-execution analysis; and quant research on historical market data.

Is ClickHouse or kdb+ more popular?

ClickHouse ranks #10 on the WhichDB Score (69.8/100) and kdb+ ranks #75 (31.8/100). Popularity is not fit: check the requirements that matter for your project.

Are ClickHouse and kdb+ open source?

Yes. ClickHouse is open source. License: Apache License 2.0. No. kdb+ is proprietary, closed-source software. License: Commercial; KDB-X Community Edition free with resource limits.