DiceDB

DiceDB is a free, open-source data structure server designed to work with Redis-compatible clients, SDKs, commands, tools, and workflows. It supports strings, hashes, lists, sets, sorted sets, and HyperLogLog. Its OBSERVE command returns the current result of a read command and sends updated results when the observed keys change. For storage tiering, the Spill module places evicted keys in RocksDB and restores them when accessed, preserving their TTLs through that process. The official Docker image starts with Spill enabled and a default 250MB memory limit for the module. Docker instructions mount a local data directory to keep data across container restarts. The documentation lists Linux, macOS, OpenBSD, NetBSD, and FreeBSD as supported operating systems; the listed platforms also include self-hosted use. DiceDB is licensed under BSD-3 Clause and its plan costs nothing. The listed data persistence field is no, while the Docker instructions describe persistence when a local data directory is mounted. That difference is relevant when deciding how to deploy it.

DiceDB combines Redis compatibility with change-driven query updates and a storage tiering module. Note the distinction between its listed persistence field and the Docker setup that mounts a local data directory.

DiceDB suits developers and operators looking for a free, Redis-compatible data structure server with query subscriptions and optional storage tiering. Its documented operating systems and Docker deployment details may help guide deployment choices.