KeyDB

6.4easy start · #13 of 25
in In-Memory Databases

Free to practise onnot on record
Free trialnot on record
Well documentedyes
Runs where you worknot on record

Runs on Linux, Mac, self-hosted.

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KeyDB is ranked #13 of 25 in in-memory databases on The Geeks Club. It runs on Linux, macOS, Self-hosted.

Compared on in-memory databases

Free plan: Yes
Deployment: self-hosted
Data persistence: Yes
High availability: Yes
SQL support: No
Vector search: No
Supported data models: strings, lists, sets, sorted sets, hashes, bitmaps, HyperLogLogs, streams

Best KeyDB alternatives

See all 12

VoltDB 0 of 4 in the starter kit Lesson 17.8 Aerospike Database 0 of 4 in the starter kit Lesson 27.7 Amazon ElastiCache 0 of 4 in the starter kit Lesson 37.1 Apache Geode 0 of 4 in the starter kit Lesson 47.1 SingleStore Helios 0 of 4 in the starter kit Lesson 57.1 eXtremeDB 0 of 4 in the starter kit Lesson 67.0

The record

Product: KeyDB is a high-performance, open-source database and a drop-in alternative to Redis.
Performance: The maker says a single node can handle over 1 million operations per second and serve data with submillisecond latency.
Data structures: KeyDB supports strings, hashes, lists, sets, sorted sets, bitmaps, hyperloglogs, geospatial indexes, and streams.
Scaling: KeyDB supports horizontal scaling through active replication or cluster mode with a sharded dataset.
Architecture: Its MVCC architecture allows snapshot queries, including SCAN and KEYS, to run concurrently without blocking existing workloads.
Replication: KeyDB supports asynchronous multi-master replication across regions using a last-write-wins method.
Persistence: KeyDB supports RDB snapshots and AOF command logging, with configurable durability preferences.
Compatibility: KeyDB is compatible with the Redis API and protocol, and Redis client libraries work with it.
Integrations: The maker lists Docker images, Ubuntu and Debian packages, CentOS RPM packages, and community Homebrew and Kubernetes Helm options.
Security: KeyDB supports TLS on client connections, replication links, and the cluster bus, as well as authentication and ACLs.
Security guidance: The maker recommends restricting network access to trusted clients and warns against exposing KeyDB directly to the internet.
Support: Support is community-based and managed by the KeyDB team at Snap; the maker says paid support is unavailable.
Intended users: The maker describes KeyDB as useful from small projects to workloads serving millions of users.
History: The project began in 2019 as a multithreaded Redis fork and found a permanent home at Snap at the end of 2021.

Where it ranks on The Geeks Club

Best In-Memory Databases in 2026#13 of 25

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Sources

docs.keydb.dev/docs/· checked 2 Oct 2026
docs.keydb.dev· checked 2 Oct 2026
docs.keydb.dev/docs/compatibility/· checked 2 Oct 2026
docs.keydb.dev/docs/download/· checked 2 Oct 2026
docs.keydb.dev/docs/security/· checked 2 Oct 2026
docs.keydb.dev/docs/support/· checked 2 Oct 2026
docs.keydb.dev/docs/about/· checked 2 Oct 2026
docs.keydb.dev/docs/intro-admin/· checked 3 Oct 2026
keydb.dev· checked 28 Sept 2026