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Rust crates · category · data Oct 24, 2026
Testing crates by real downloads
crates.io describes this category as: “Crates to help you verify the correctness of your code.” Below are the 14 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, static_assertions leads Testing with 1,442,265 real downloads a day (widely used and quiet for years). 9 of the 14 have 1,000+ dependents; 1 have shipped nothing in 2+ years. Release spikes barely matter here: the median crate got 0.9% of its downloads within 2 days of a release.
14 crates
| Compare | ||||||
|---|---|---|---|---|---|---|
| static_assertionsWidely used | 1,442,265 | 1,688 | 7.0y | +1% | 562M | |
| proptestFoundational | 663,355 | 12,243 | 14d | +13% | 221M | |
| arbitraryWidely used | 574,083 | 1,030 | 18d | -2% | 184M | |
| rusty-forkPulled in | 504,858 | 87 | 13mo | +3% | 184M | |
| serial_testWidely used | 429,325 | 2,974 | 3mo | -11% | 168M | |
| serial_test_derivePulled in | 428,253 | 9 | 3mo | -11% | 166M | |
| mockallWidely used | 406,667 | 1,393 | 4mo | -15% | 183M | |
| mockall_derivePulled in | 406,392 | 2 | 4mo | -15% | 183M | |
| rstestWidely used | 381,347 | 3,531 | 6d | +2% | 137M | |
| instaWidely used | 379,798 | 4,970 | 21d | +2% | 117M | |
| derive_arbitraryPulled in | 369,897 | 9 | 18d | -12% | 130M | |
| rstest_macrosPulled in | 365,882 | 2 | 6d | +2% | 130M | |
| tokio-testWidely used | 234,527 | 4,239 | 29d | -1% | 104M | |
| assert_cmdWidely used | 228,260 | 5,434 | 5mo | -9% | 93.2M |
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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