Crate

futures-util

Stream and Future combinators from the futures ecosystem.

What it is

futures-util provides StreamExt, FutureExt, and associated combinators — map, filter, chain, merge, buffered, and more. It is a lighter-weight subset of the futures crate, giving libraries access to async utilities without pulling in the full futures dependency.

Why it is commonly used

Used in async code that manipulates streams and futures — especially in libraries that want a smaller transitive dependency footprint than the full futures crate while still offering combinator-style async APIs.

1.0k

Repositories

91%

Actively maintained

928

Updated ≤ 30 days

2.9M

Total stars

904

Owners

Counted from the Cargo.toml manifests of the 1.0k indexed repositories that declare futures-util as a dependency — not download counts. Dependency data last verified 2026-08-13.

Browse 1025 repositories using futures-util in Repos →

Often used with

Crates that show up unusually often in futures-util projects. The most distinctive pairings rank first — crates these projects use far more than the average indexed Rust project does, not just crates that are popular everywhere. Each percentage is the share of futures-util projects that also use it.

tokio-tungstenite29.6%futures-core13.8%redis10.5%pin-project-lite13.3%pin-project11%tracing-opentelemetry14.9%http-body-util23.3%opentelemetry-otlp17.7%opentelemetry_sdk18.3%jsonwebtoken16.9%opentelemetry19.7%hyper-util22.2%hyper27.5%tokio-rustls18%mime_guess12.9%http36.7%argon211.1%sqlx17.6%prometheus11.6%async-stream17.1%webpki-roots10%tokio-util46.1%rustls-pemfile10.6%aes-gcm12.5%

Used by these organizations

Cloudflare AWS Microsoft Google Oxide Computer Parity Technologies Deno Zed Industries Fly.io PingCAP SurrealDB Embark Studios The Rust Project Fuel Labs Tauri Warp Meilisearch Rerun Tokio Bevy Engine Bytecode Alliance Linebender Qdrant Polars Quickwit Datadog Hyperium Actix probe-rs Helix Zellij PyO3 Wasmer Tracel AI libp2p Diesel Servo Paradigm Matrix.org

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