Salvatore Sanfilippo wrote Redis (REmote DIctionary Server) in 2009 to speed up a real-time web analytics product. Its simple protocol, in-memory speed and data structures such as lists, sets and sorted sets made it the standard cache and message broker for web applications. Sponsorship moved from VMware to Pivotal and then to Redis Labs, now Redis Ltd.
In March 2024 Redis Ltd. moved Redis from the BSD licence to source-available licences. Cloud providers and former contributors responded with Valkey, a BSD-licensed fork under the Linux Foundation. Redis 8.0 (2025) added the AGPLv3 as an open-source option and merged the Redis Stack modules into the core.
