Crates / Category
Rust crates · category · data Oct 24, 2026
Concurrency crates by real downloads
crates.io describes this category as: “Crates for implementing concurrent and parallel computation.” Below are the 15 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, parking_lot_core leads Concurrency with 2,995,937 real downloads a day (few direct dependents and steady). 3 of the 15 have 1,000+ dependents; 3 have shipped nothing in 2+ years. Release spikes barely matter here: the median crate got 1.6% of its downloads within 2 days of a release.
15 crates
| Compare | ||||||
|---|---|---|---|---|---|---|
| parking_lot_corePulled in | 2,995,937 | 47 | 3d | -7% | 1.2B | |
| parking_lotWidely used | 2,961,161 | 8,755 | 3d | -6% | 1.2B | |
| lock_apiEstablished | 2,874,492 | 143 | 3d | -6% | 1.1B | |
| crossbeam-utilsEstablished | 2,696,777 | 605 | 49d | +2% | 1B | |
| sync_wrapperPulled in | 2,090,796 | 83 | 23mo | +1% | 736M | |
| crossbeam-epochEstablished | 2,073,178 | 114 | 49d | +3% | 753M | |
| crossbeam-dequeEstablished | 1,924,167 | 142 | 49d | +1% | 714M | |
| atomic-wakerEstablished | 1,911,010 | 116 | 3.1y | +8% | 562M | |
| try-lockPulled in | 1,879,742 | 9 | 2.9y | +3% | 717M | |
| portable-atomicEstablished | 1,871,271 | 512 | 2mo | +0% | 532M | |
| sharded-slabPulled in | 1,733,301 | 32 | 3.1y | +0% | 621M | |
| rayonFoundational | 1,615,491 | 11,972 | 6mo | +3% | 619M | |
| rayon-corePulled in | 1,568,771 | 69 | 14mo | +5% | 607M | |
| crossbeam-channelWidely used | 1,564,625 | 2,767 | 49d | -2% | 66M | |
| event-listenerEstablished | 1,515,562 | 237 | 3mo | +2% | 599M |
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