Crates / Category
Rust crates · category · data Oct 24, 2026
FFI crates by real downloads
crates.io describes this category as: “Crates to help you better interface with other languages. This includes binding generators and helpful language constructs.” Below are the 16 crates in it among the 1000 most-downloaded crates, ranked by real downloads (quiet-day baseline) instead of raw count.
Short answerBy steady daily use, bindgen leads FFI with 1,018,499 real downloads a day (widely used and steady). 5 of the 16 have 1,000+ dependents; 1 have shipped nothing in 2+ years. Release spikes barely matter here: the median crate got 0.0% of its downloads within 2 days of a release.
16 crates
| Compare | ||||||
|---|---|---|---|---|---|---|
| bindgenWidely used | 1,018,499 | 3,072 | 46d | -2% | 433M | |
| pyo3-build-configEstablished | 835,359 | 156 | 10d | -18% | 293M | |
| pyo3Widely used | 817,609 | 2,315 | 10d | -18% | 284M | |
| pyo3-ffiPulled in | 814,393 | 12 | 10d | -19% | 270M | |
| pyo3-macros-backendPulled in | 813,880 | 1 | 10d | -18% | 281M | |
| pyo3-macrosPulled in | 813,099 | 3 | 10d | -18% | 281M | |
| objc2Widely used | 607,001 | 1,193 | 19d | +10% | 142M | |
| objc2-core-foundationEstablished | 539,144 | 422 | 13mo | +11% | 107M | |
| block2Established | 538,869 | 530 | 13mo | +6% | 125M | |
| objc2-foundationWidely used | 520,494 | 1,007 | 13mo | +14% | 109M | |
| objc2-encodePulled in | 486,010 | 1 | 21mo | +7% | 119M | |
| cpp_demanglePulled in | 329,132 | 64 | 12mo | -6% | 114M | |
| widestringEstablished | 308,184 | 319 | 12mo | -4% | 121M | |
| cbindgenEstablished | 215,284 | 454 | 5mo | +2% | 112M | |
| os_str_bytesPulled in | 211,293 | 47 | 3mo | -21% | 205M | |
| serde-wasm-bindgenWidely used | 191,519 | 1,141 | 2.7y | -2% | 87.3M |
Click a column to sort; press + to add a crate to a comparison. Real / day = median downloads on days with no release that day or the day before. Each crate's page shows its verdict and the 4 rules behind it. Why this method · this category on crates.io
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