Redis

Redis brand colours

Extracted from the artwork and ranked by how much of the mark each covers — not from a brand book, so treat them as observed rather than official.

Redis is the in-memory data structure server that became the default cache, queue and rate limiter for most web applications. Strings, hashes, sorted sets, streams and pub/sub cover an enormous range of problems with predictable sub-millisecond latency, and the single-threaded execution model makes its consistency behaviour easy to reason about. Its 2024 licence change away from BSD split the ecosystem: Valkey, the Linux Foundation fork, is now the default in several distributions and clouds, and Redis subsequently added AGPL back as an option. That history matters when you are choosing a hosted provider — Upstash, Redis Cloud, AWS ElastiCache, Aiven and DigitalOcean are not all running the same code any more. Redis competes with Memcached on pure caching, with Kafka and SQS on queueing, and increasingly with Postgres, which has quietly become good enough at both to remove the need for a second system.