Both Redis Enterprise and Amazon ElastiCache price by GB of RAM provisioned per node, and because an in-memory store has to hold its entire working set in memory, that meter scales linearly with dataset size and shard count rather than actual query volume. AWS has already swapped Valkey in as ElastiCache's default engine for new clusters, which means the underlying software is free - the bill only pays for AWS operating it on your behalf. Valkey, KeyDB, and Redict install as direct RESP-protocol replacements, keeping the same maxmemory-policy and AOF/RDB persistence settings already defined in an existing docker-compose.yml. Dragonfly and Garnet go further with alternate engines—a shared-nothing multi-threaded core and a tiered RAM/SSD storage layer, respectively—that let a single self-managed instance replace a multi-node cluster outright.
| Name | Main Category | Sub-Category | Target Alternative | Free Tier Summary | Self-Hostable? | Short Description | Primary Link |
|---|---|---|---|---|---|---|---|
Valkey | Databases & Backend-as-a-Service | In-Memory Cache / Key-Value Store | Redis Enterprise / ElastiCache | 100% Free - Open Source (BSD-3-Clause) | Yes - Docker / Binary | BSD-3-Clause licensed, Linux Foundation-governed fork of Redis 7.2.4 with full RESP2/RESP3 protocol compatibility. It's now the default engine behind AWS ElastiCache and Google Memorystore for new clusters, with atomic slot migration and no vendor re-licensing risk. | |
Garnet | Databases & Backend-as-a-Service | In-Memory Cache / Key-Value Store | Redis Enterprise / ElastiCache | 100% Free - Open Source (MIT) | Yes - Docker / Binary | Microsoft Research's RESP-compatible cache-store built on the Tsavorite storage engine, offering tiered RAM/SSD storage, cluster sharding, and sub-millisecond latencies on Azure or bare metal. MIT-licensed and works with unmodified Redis clients like StackExchange.Redis and redis-py. | |
Dragonfly | Databases & Backend-as-a-Service | In-Memory Cache / Key-Value Store | Redis Enterprise / ElastiCache | Free Self-Hosted - BSL 1.1 (hosting it as a managed service is excluded) | Yes - Docker / Binary | A ground-up C++ rewrite of the Redis and Memcached protocols using a shared-nothing, multi-threaded architecture that lets a single large instance replace a sharded Redis Cluster. Source-available under BSL 1.1 - free to self-host in production, restricted only from being resold as a hosted cache service. | |
Redict | Databases & Backend-as-a-Service | In-Memory Cache / Key-Value Store | Redis Enterprise / ElastiCache | 100% Free - Open Source (LGPL-3.0-only) | Yes - Docker / Binary | An independent, community-governed LGPL-3.0 fork of Redis OSS 7.2.4 for teams who want Redis compatibility without depending on a single commercial vendor. Distributed via Codeberg with official container images rather than GitHub or Docker Hub. | |
KeyDB | Databases & Backend-as-a-Service | In-Memory Cache / Key-Value Store | Redis Enterprise / ElastiCache | 100% Free - Open Source (BSD-3-Clause) | Yes - Docker / Binary | A multi-threaded fork of Redis maintained by Snap Inc., adding per-connection thread affinity and active-active replication on top of the standard Redis command set. Fully open source under BSD-3-Clause with no separate paid tier or feature gate. |
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