Redis
The in-memory data store everyone uses
Databases / Data · RSALv2/SSPLv1/AGPLv3 · 77k
Reviewed 2026-08-19 · last push 2026-10-21 · repo checked 2026-10-21
What's Good
Blazing fast for what it does. Data structures beyond simple key-value unlock powerful patterns. Pub/sub enables real-time features. The ecosystem is massive—every language has a client.
The Catch
License: not MIT. Since Redis 8 the server is tri-licensed RSALv2 / SSPLv1 / AGPLv3 at your choice — AGPLv3 is the only OSI option and carries network copyleft; 7.4–7.x was RSALv2/SSPLv1 only. If you need BSD-3 Redis-protocol, look at Valkey. Memory-bound storage is expensive at scale. Persistence options have tradeoffs. Clustering adds complexity.
Verdict
The default choice for caching and session storage.
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