Rust crates side by side · data Oct 24, 2026
ctr vs cbc
Short answerBy steady daily use, ctr is bigger: 757,345 real downloads a day against 521,773 for cbc (1.5x). 344 crates depend on ctr and 676 on cbc. ctr last shipped 5 months ago, cbc 5 months ago.
ctr
EstablishedEstablished and gaining.
344 crates depend on it; no release in the last 90 days, so its count is all steady use.
CTR block modes of operation
cbc
EstablishedEstablished and steady.
676 crates depend on it; no release in the last 90 days, so its count is all steady use.
Cipher Block Chaining (CBC) block cipher mode of operation
ctrcbc · 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 | ctr | cbc |
|---|---|---|
| Real downloads a day | 757,345 | 521,773 |
| Crates that depend on it | 344 | 676 |
| Last release | 0.10.1, 5 months ago | 0.2.1, 5 months ago |
| Trend vs the field | +11% | +7% |
| Release-window share | 0.0% | 0.0% |
| Downloads in the window | 69,477,115 | 47,245,358 |
| All-time downloads | 238,333,950 | 124,723,512 |
| Versions published | 28 | 14 |
| License | MIT OR Apache-2.0 | MIT OR Apache-2.0 |
| MSRV | 1.85 | 1.85 |
| First published | Jul 30, 2018 | Apr 10, 2021 |
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 (cbc, 676 dependents): more eyes, more answered questions, and you may already have it in your tree.
- Check the release dates against your own pace: ctr 5 months ago, cbc 5 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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