Crates / Compare / crc32fast vs crc
Rust crates side by side · data Oct 24, 2026
crc32fast vs crc
Short answerBy steady daily use, crc32fast is bigger: 2,229,287 real downloads a day against 930,857 for crc (2.4x). 1,440 crates depend on crc32fast and 601 on crc. crc32fast last shipped 4 days ago, crc 11 months ago.
crc32fast
Widely usedWidely used and steady.
1,440 crates depend on it; downloads don't spike on releases.
Fast, SIMD-accelerated CRC32 (IEEE) checksum computation
crc
EstablishedEstablished and steady.
601 crates depend on it; no release in the last 90 days, so its count is all steady use.
Rust implementation of CRC with support of various standards
crc32fastcrc · 100% = that crate's normal quiet day, so a spike to 300% is triple its usual traffic
Every number, side by side
| Same window, same method | crc32fast | crc |
|---|---|---|
| Real downloads a day | 2,229,287 | 930,857 |
| Crates that depend on it | 1,440 | 601 |
| Last release | 1.5.3, 4 days ago | 3.4.0, 11 months ago |
| Trend vs the field | +6% | -5% |
| Release-window share | 6.6% | 0.0% |
| Downloads in the window | 203,725,325 | 80,912,999 |
| All-time downloads | 791,416,317 | 320,122,747 |
| Versions published | 21 | 30 |
| License | MIT OR Apache-2.0 | MIT OR Apache-2.0 |
| MSRV | 1.63 | 1.83 |
| First published | Nov 13, 2018 | Mar 15, 2015 |
Which to pick
- Downloads tell you what is common, not what fits. Each crate's own description above says what it is for; when the jobs differ, pick by the job.
- When both fit, prefer the one more crates depend on (crc32fast, 1,440 dependents): more eyes, more answered questions, and you may already have it in your tree.
- Check the release dates against your own pace: crc32fast 4 days ago, crc 11 months ago.
Also in this space
Method
Real downloads = the median day with no release that day or the day before, from the crates.io API (Jul 27, 2026 to Oct 23, 2026). Raw crates.io counts include CI and bots and run high (why); the method is from our 90-day study.
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