Lux vs KeyDB
KeyDB is a multi-threaded Redis fork. Lux is a ground-up rewrite in Rust.
| Feature | Lux | KeyDB |
|---|---|---|
| Language | Rust | C++ (Redis fork) |
| Vector search | Built-in (VSET/VSEARCH) | Not supported |
| Binary size | ~2MB | ~14MB |
| Architecture | Built from scratch | Forked from Redis |
| Threading | 128 shards, lock-free reads | Multi-threaded I/O |
| Protocol | RESP | RESP + extensions |
| License | MIT | BSD-3 |
| Active development | Yes | Acquired by Snap, uncertain |
| Managed hosting | Lux Cloud ($10/mo per project) | None official |
Why Lux over KeyDB?
KeyDB started as a promising multi-threaded Redis fork, but after its acquisition by Snap in 2022, development has slowed significantly. Lux is actively developed, purpose-built in Rust for performance and safety, and has a simpler codebase that's easier to reason about.
When to use KeyDB instead
If you need FLASH storage tier support, active replication, or KeyDB-specific extensions like EXPIREMEMBER, KeyDB has features Lux doesn't. For standard key-value workloads, Lux is simpler and faster.