Dragonfly Has a Free Drop-In Redis Replacement

Dragonfly is a free, open-source in-memory data store that is a drop-in replacement for Redis — but 25x faster and uses 80% less memory.

What Is Dragonfly?

Dragonfly is a modern in-memory cache built from scratch in C++. It is compatible with the Redis and Memcached APIs but dramatically more efficient.

Key features:

• 25x faster throughput than Redis
• 80% less memory usage
• Redis API compatible (drop-in replacement)
• Memcached API compatible
• Multi-threaded (uses all CPU cores)
• Snapshotting without forks
• Single binary

Quick Start

docker run -d --name dragonfly -p 6379:6379 docker.dragonflydb.io/dragonflydb/dragonfly

Now use any Redis client:

redis-cli -p 6379
SET hello world
GET hello

Drop-In Replacement

import redis
r = redis.Redis(host="localhost", port=6379)
r.set("key", "value")
print(r.get("key"))  # Works exactly like Redis

No code changes needed. Just swap Redis for Dragonfly.

Dragonfly vs Redis

Feature	Redis	Dragonfly
Threads	Single	Multi-threaded
Memory efficiency	Baseline	80% less
Throughput (1 instance)	100K ops/sec	2.5M ops/sec
Snapshots	Fork (doubles RAM)	No fork
Clustering needed	For scale	Rarely

With 28K+ GitHub stars. Redis, but better.

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