Crates / Compare / static_assertions vs assert_cmd
Rust crates side by side · data Oct 24, 2026
static_assertions vs assert_cmd
Short answerBy steady daily use, static_assertions is bigger: 1,442,265 real downloads a day against 228,260 for assert_cmd (6.3x). 1,688 crates depend on static_assertions and 5,434 on assert_cmd. static_assertions last shipped 7.0 years ago, assert_cmd 5 months ago.
static_assertions
Widely usedWidely used and quiet for years.
1,688 crates depend on it; no release in the last 90 days, so its count is all steady use.
Compile-time assertions to ensure that invariants are met.
assert_cmd
Widely usedWidely used and steady.
5,434 crates depend on it; no release in the last 90 days, so its count is all steady use.
Test CLI Applications.
static_assertionsassert_cmd · 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 | static_assertions | assert_cmd |
|---|---|---|
| Real downloads a day | 1,442,265 | 228,260 |
| Crates that depend on it | 1,688 | 5,434 |
| Last release | 1.1.0, 7.0 years ago | 2.2.2, 5 months ago |
| Trend vs the field | +1% | -9% |
| Release-window share | 0.0% | 0.0% |
| Downloads in the window | 130,951,945 | 20,390,918 |
| All-time downloads | 561,828,019 | 93,183,964 |
| Versions published | 15 | 50 |
| License | MIT OR Apache-2.0 | MIT OR Apache-2.0 |
| MSRV | not set | 1.85 |
| First published | Aug 13, 2017 | May 28, 2018 |
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 (assert_cmd, 5,434 dependents): more eyes, more answered questions, and you may already have it in your tree.
- Check the release dates against your own pace: static_assertions 7.0 years ago, assert_cmd 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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