moka-rs/moka

Health v2 · maintenance only

Adoption not part of the score

2670 stars · 126 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Moka is a fast, concurrent in-memory caching library for Rust, inspired by Java's Caffeine. It provides thread-safe synchronous and async caches with size bounding, TinyLFU admission/LRU eviction, TTL/TTI expiration, and eviction listeners.

Use cases

• cache expensive computation results in a Rust application
• add an in-memory cache with TTL expiration to my API server
• bound a shared hashmap by entry count or weighted size
• share a thread-safe cache across OS threads
• use an async-aware cache in a Tokio service
• improve cache hit ratio with LFU-based admission
• run callbacks when cache entries are evicted

When to choose

• you need a high-performance concurrent cache in Rust with near-optimal hit ratios
• you want Caffeine-like eviction policies (TinyLFU admission, LRU eviction) in Rust
• you need both sync and async cache APIs with TTL, TTI, and per-entry expiration
• you need size-aware eviction or eviction listener callbacks

When to avoid

• you need a distributed or shared cache across processes or machines (use Redis or similar)
• you need persistent or on-disk caching
• you are not working in Rust

Facets

library · maturity stable

caching developer-tools performance backend rust cross-platform in-memory-cache concurrent caffeine-inspired lfu lru ttl async

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