Comparisons that start from Redis Open Source, the in-memory data store now offered under AGPLv3, RSALv2 or SSPLv1, against open-source alternatives that keep a permissive license.
Stay on Redis Open Source under its AGPLv3, RSALv2 or SSPLv1 choice, or move to the BSD-licensed Linux Foundation fork. Covers license obligations for internal and hosted use, the search, JSON and vector features bundled in Redis 8, the version cut-off that decides migration effort (Redis 7.2 and earlier versus 7.4 and later), and high availability on each side.
Redis (AGPLv3, RSALv2 or SSPLv1) against BSD-licensed Memcached, the multithreaded cache that never writes to disk: data structures, persistence and replication, licensing, and when a pure cache is the better fit, with Valkey as the permissive Redis option.
Two ways to make Redis or Valkey highly available: Sentinel failover for a single primary with at least three Sentinels, against Redis Cluster sharding across 16384 hash slots with at least three primaries, on scaling, multi-key limits and client support.
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