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Redis vs Memcached vs Dragonfly (2026): In-Memory Data Store Comparison

When your database becomes a bottleneck, an in-memory data store is the standard solution. Redis has dominated this space for a decade, but Dragonfly (a modern Redis-compatible drop-in replacement) claims 25x throughput, and Memcached still excels at pure caching. This comparison focuses on real throughput numbers and when each tool fits your architecture.

Quick Comparison

Feature Redis 7 Memcached Dragonfly

Type Data structure server Pure key-value cache Redis-compatible, multi-threaded

Language C C C++

Data Structures Strings, Lists, Sets, Hashes, Sorted Sets, Streams, JSON, Time Series, Probabilistic Strings only All Redis data structures (Redis API compatible)

Persistence RDB snapshots, AOF, both combined None (cache only) Snapshotting

Replication Primary-replica, Redis…