Crates / Compare / approx vs float-cmp
Rust crates side by side · data Oct 24, 2026
approx vs float-cmp
Short answerBy steady daily use, approx is bigger: 533,813 real downloads a day against 483,211 for float-cmp (1.1x). 2,697 crates depend on approx and 318 on float-cmp. approx last shipped 9 months ago, float-cmp 2.1 years ago.
approx
Widely usedWidely used and steady.
2,697 crates depend on it; no release in the last 90 days, so its count is all steady use.
Approximate floating point equality comparisons and assertions.
float-cmp
EstablishedEstablished and quiet for years.
318 crates depend on it; no release in the last 90 days, so its count is all steady use.
Floating point approximate comparison traits
approxfloat-cmp · 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 | approx | float-cmp |
|---|---|---|
| Real downloads a day | 533,813 | 483,211 |
| Crates that depend on it | 2,697 | 318 |
| Last release | 0.6.0-rc2, 9 months ago | 0.10.0, 2.1 years ago |
| Trend vs the field | +9% | -2% |
| Release-window share | 0.0% | 0.0% |
| Downloads in the window | 50,061,368 | 43,190,559 |
| All-time downloads | 185,170,316 | 197,119,791 |
| Versions published | 13 | 24 |
| License | Apache-2.0 | MIT |
| MSRV | not set | not set |
| First published | Nov 15, 2015 | Jan 19, 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 (approx, 2,697 dependents): more eyes, more answered questions, and you may already have it in your tree.
- Check the release dates against your own pace: approx 9 months ago, float-cmp 2.1 years 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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