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eXtremeDB vs RocksDB

eXtremeDB: Embedded in-memory and hybrid database for devices, real-time systems and time-series analytics. RocksDB: Meta's embeddable LSM-tree key-value engine, the storage layer under dozens of databases.

key differences

  • Licensing: eXtremeDB is proprietary (Commercial (per-product licensing)); RocksDB is open source (permissive) (Apache License 2.0 or GPL-2.0 (dual)).
  • Horizontal scaling is native in eXtremeDB and none in RocksDB.
  • Only eXtremeDB has joins, secondary indexes, vector search, geospatial, columnar storage.
  • Only RocksDB has ttl / expiry.

choose extremedb for

  • +Embedded databases in network equipment
  • +Avionics and defence systems
  • +Industrial controllers and edge gateways
  • +In-process market data analytics

best at · Embedded, Edge, Time-series

choose rocksdb for

  • +Storage engine for a custom database or service
  • +Stream-processing state stores (Kafka Streams, Flink)
  • +MySQL storage engine via MyRocks
  • +Write-heavy local indexes and caches on SSD

best at · Embedded, OLTP, Streaming

eXtremeDBEmbedded in-memory and hybrid database for devices, real-time systems and time-series analytics.
RocksDBMeta's embeddable LSM-tree key-value engine, the storage layer under dozens of databases.
overview
Primary model
Key-Value
Key-Value
Also supports
Relational, Time-Series, Columnar / OLAP, Vector
–
Type
Embedded library
Embedded library
Status
Active
Active
Developer
McObject
Meta
First release
2001
2013
Latest version
9.0 (Jul 15, 2026)
11.12 (Oct 26, 2026)
License
ProprietaryCommercial (per-product licensing)
Open source (permissive)Apache License 2.0 or GPL-2.0 (dual)
Free tier
—
✓
popularity
WhichDB Score
4.0
48.2
Rank
#421
#30
GitHub stars
–
32.2K
Stack Overflow questions
–
504
scale & guarantees
Comfortable data size
Medium (≤ 10 TB)
Medium (≤ 10 TB)
Horizontal scaling
Native
None
Multi-region
None
None
ACID
Full
Full
Consistency
Strong
Strong
Schema
Strict
Schemaless
Architecture
Embedded, In memory, Client server, Distributed
Embedded
deployment
Self-hosted
✓
✓
Vendor-managed cloud
—
—
Serverless
—
—
Embedded
✓
✓
Edge
✓
—
Clouds
–
–
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 (eXtremeSQL), Native C/C++ API
C++ API
Client languages
C, C++, Java, Python, C#
C++, C, Java
Best for
Embedded, Edge, Time-series, Tick data
Embedded, OLTP, Streaming, Metadata
Add more to this comparisonNot sure either fits? Try smart match

eXtremeDB vs RocksDB: FAQ

What is the difference between eXtremeDB and RocksDB?

eXtremeDB: Embedded in-memory and hybrid database for devices, real-time systems and time-series analytics. RocksDB: Meta's embeddable LSM-tree key-value engine, the storage layer under dozens of databases. Licensing: eXtremeDB is proprietary (Commercial (per-product licensing)); RocksDB is open source (permissive) (Apache License 2.0 or GPL-2.0 (dual)). Horizontal scaling is native in eXtremeDB and none in RocksDB. Only eXtremeDB has joins, secondary indexes, vector search, geospatial, columnar storage.

When should I choose eXtremeDB over RocksDB?

Choose eXtremeDB for embedded databases in network equipment; avionics and defence systems; and industrial controllers and edge gateways. Choose RocksDB for storage engine for a custom database or service; stream-processing state stores (Kafka Streams, Flink); and MySQL storage engine via MyRocks.

Is eXtremeDB or RocksDB more popular?

RocksDB ranks #30 on the WhichDB Score (48.2/100) and eXtremeDB ranks #421 (4.0/100). Popularity is not fit: check the requirements that matter for your project.

Are eXtremeDB and RocksDB open source?

No. eXtremeDB is proprietary, closed-source software. License: Commercial (per-product licensing). Yes. RocksDB is open source. License: Apache License 2.0 or GPL-2.0 (dual).