Crates / wit-bindgen-core
Rust crate · real downloads · data Oct 24, 2026
wit-bindgen-core downloads, and should you depend on it?
Low-level support for bindings generation based on WIT files for use with `wit-bindgen-cli` and other languages. crates.io · docs.rs · repository
Owned on crates.io by wasmtime-publish · is it still maintained?
Feature flags + Cargo.toml picker
Few direct dependents and losing ground.
wit-bindgen-core: only 38 crates name it directly; most of its downloads come in through wit-bindgen-rust and wit-bindgen-rust-macro; downloads don't spike on releases.
How this verdict is decided (4 rules)
- Usage: crates.io reverse dependencies (crates that list it as a dependency): 10,000+ = foundational, 1,000+ = widely used, 100+ = established, under 100 = few direct dependents.
- Direction: the median quiet day in the last 30 days of the window against the first 30, read against the median tracked crate (the whole field moved +39% from late summer to October, so a raw trend says nothing). 10%+ ahead of the field = gaining; 10%+ behind = losing ground; otherwise steady. Steady with no release in 2+ years = quiet for years.
- Release spikes: the median release-window day against the quiet-day baseline: under 1.15x = no spike, 1.15x to 1.3x = small bumps, 1.3x or more = jumps on release days.
- Release recency: days since the newest version that was not yanked, from crates.io publish times.
release window (release day + next day)quiet dayquiet-day median · download the 89 days as CSV
The numbers in one paragraphwit-bindgen-core got 47,026,096 crates.io downloads from Jul 27, 2026 to Oct 23, 2026. 9% of them landed within 2 days of one of its 4 releases. On the other 82 quiet days it got a median of 565,522 a day, about 3,958,650 a week. Capping release days at that baseline leaves 46,623,378 release-adjusted downloads for the window.
What this means if you're choosing a dependency
- You rarely add this one yourself. Only 38 crates name it directly; its downloads arrive through wit-bindgen-rust, wit-bindgen-rust-macro.
- Actively released. 0.63.0 shipped 10 days ago (Oct 14, 2026).
- Still pre-1.0 (0.63.0). Under Cargo's semver rules a 0.x minor bump may break you, so pin the minor version (
wit-bindgen-core = "0.63") and read the changelog on upgrades. - Fit check: license Apache-2.0 WITH LLVM-exception OR Apache-2.0 OR MIT, edition 2024, needs Rust 1.85.0 or newer (from the latest version's manifest).
- Compare it by the baseline, not the raw count. 9% of its 47,026,096 downloads in the window landed within 2 days of a release; the steady number is 565,522 a day.
Its place in the dependency graph
Built on wit-bindgen-core
2 of the 1000 crates we track depend on it directly (biggest first).
wit-bindgen-core builds on
Tracked crates its latest version (0.63.0) depends on (optional ones marked).
What the chart says
- Weekend quiet days ran at 56% of weekday quiet days (328,293 vs 586,974). A dip that deep is the signature of work-week CI pipelines and developers building on weekdays.
- Biggest day: 794,471 on Oct 22, 2026, a quiet day with no release nearby.
Every number
| All-time downloads | 124,074,117 (rank #813 on crates.io by all-time downloads) |
| Downloads in the window | 47,026,096 (Jul 27, 2026 to Oct 23, 2026, 89 days) |
| Within 2 days of a release | 4,330,142 (9.2%) |
| Quiet-day median (baseline) | 565,522 a day; weekdays 586,974, weekends 328,293 |
| Release-adjusted downloads | 46,623,378 (release-window days capped at the baseline) |
| Baseline rank | #598 of the 1000 crates we track |
| Quiet-day trend | +15% raw, -17% against the median tracked crate (+39%) |
| Releases in the window | 4 |
| Versions published, ever | 72 |
| Latest version | 0.63.0, published Oct 14, 2026 (license Apache-2.0 WITH LLVM-exception OR Apache-2.0 OR MIT, edition 2024, MSRV 1.85.0) |
| First published | Feb 13, 2023 |
| Reverse dependencies | 38 |
Releases in the window
Each one opens a 2-day release window on the chart.
| Version | Published | Downloads that version got (lifetime) |
|---|---|---|
| 0.63.0 | Oct 14, 2026 | 63,231 |
| 0.62.0 | Sep 10, 2026 | 391,905 |
| 0.61.1 | Aug 25, 2026 | 277,188 |
| 0.61.0 | Aug 24, 2026 | 4,241 |
How we compute this
crates.io counts every download, including CI runners, mirrors and bots that fetch each new version, so raw counts run high (why, in The Manual). We split the last 89 days into release windows (the day a version of wit-bindgen-core was published, plus the next day) and quiet days, and use the median quiet day as the baseline: an upper bound on steady use, never a head count. The method and data come from our study of 90 days of crates.io data from 69 crates, featured in This Week in Rust #674; check any crate live with the real-downloads checker.
Badge for your README
Maintainers can show the baseline in a README. It is optional, updates when we refresh the data, and links back here. Preview, then copy:
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Publishing a crate of your own? How to publish a Rust crate to crates.io, step by step.
Categories
Sources
- Daily downloads: crates.io API, /crates/wit-bindgen-core/downloads (last 90 days, all versions), fetched Oct 24, 2026.
- Versions and publish times: crates.io API, /crates/wit-bindgen-core/versions, same fetch.
- Reverse dependencies: crates.io reverse dependencies, same fetch. Dependency edges between tracked crates: each crate's default version, crates.io API.
- Fetched politely (one request every 2 seconds, identified User-Agent) per the crates.io data access policy. Data is crates.io's; the release-window split, baseline and verdict rules are ours, CC BY 4.0.
Up next
Next by real downloads: The next crate down the real-downloads ranking: 565,244 a day. Few direct dependents and losing ground.wit-bindgen-rustRust crate. Rust bindings generator for WIT and the component model, typically used through the `wit-bindgen` crate's `generate!` macro. Real use: 565K downloads a day...Read it next →Also worth your time