Redis is an open-source in-memory data structure store used as a database cache message broker and lightweight event hub. It supports strings hashes lists sets sorted sets streams and pub/sub messaging. Its speed comes from memory-first operation with optional persistence replication and clustering.
Redis's core is free/open-source. Managed Redis Cloud offers a free tier and paid tiers starting around $5/month, with pay-as-you-go capacity and enterprise subscription options; costs scale with memory throughput regions and support.
Open Source
Redis is exceptionally strong for low-latency caching session storage queues and lightweight real-time data access. Its simplicity and broad language support make it easy to add to existing applications, while advanced clustering persistence and memory planning require careful tuning. It is best suited for teams that need a fast in-memory layer rather than a full relational database.
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