Crates / Category
Rust crates · category · data Oct 24, 2026
No dynamic allocation crates by real downloads
crates.io describes this category as: “Crates that are able to function without the Rust alloc crate.” Below are the 18 crates in it among the 300 most-downloaded crates, ranked by real downloads (quiet-day baseline) instead of raw count.
Short answerBy steady daily use, itertools leads No dynamic allocation with 4,545,996 real downloads a day (widely used and steady). 7 of the 18 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.
18 crates
| Compare | ||||||
|---|---|---|---|---|---|---|
| itertoolsWidely used | 4,545,996 | 8,656 | 4mo | +1% | 1.7B | |
| unicode-identEstablished | 4,390,154 | 222 | 12d | +0% | 1.6B | |
| serdeFoundational | 4,327,945 | 133,588 | 3mo | -5% | 1.6B | |
| itoaEstablished | 4,278,839 | 791 | 7mo | -4% | 1.5B | |
| serde_deriveWidely used | 4,161,400 | 6,497 | 3mo | -3% | 1.5B | |
| serde_coreEstablished | 3,794,333 | 229 | 3mo | -1% | 74M | |
| zmijPulled in | 3,408,700 | 96 | 3mo | +1% | 579M | |
| pin-project-liteWidely used | 3,270,978 | 1,708 | 8mo | -2% | 1.2B | |
| zerocopyEstablished | 3,245,504 | 878 | 11d | -5% | 1B | |
| ryuEstablished | 3,105,583 | 390 | 8mo | -7% | 1.3B | |
| rustversionEstablished | 2,686,635 | 652 | 4mo | -1% | 879M | |
| unicode-widthWidely used | 2,194,046 | 3,230 | 13mo | -2% | 901M | |
| num-convPulled in | 2,114,479 | 4 | 5mo | -3% | 645M | |
| powerfmtPulled in | 1,889,786 | 5 | 19d | +2% | 629M | |
| portable-atomicEstablished | 1,871,271 | 512 | 2mo | +0% | 532M | |
| pin-project-internalPulled in | 1,484,850 | 1 | 5mo | -6% | 644M | |
| pin-projectWidely used | 1,484,314 | 1,406 | 5mo | -6% | 644M | |
| pasteWidely used | 1,338,247 | 3,246 | 2.5y | -3% | 574M |
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