Crates / id-arena / Alternatives
Rust crate alternatives · data Oct 24, 2026
Alternatives to id-arena
Short answerThe closest alternatives to id-arena on crates.io data are once_cell (3.8M real downloads a day), zerovec-derive (2.6M real downloads a day), zerovec (2.5M real downloads a day). Of the 8 we list, the most used is thiserror, and 8 shipped a release in the last year. id-arena itself gets 640,306 a day with 65 dependents.
Every alternative we found
| Alternative | Real downloads a day | vs id-arena | Dependents | Last release | Why it is listed | |
|---|---|---|---|---|---|---|
| once_cell Widely used | 3,785,180 | 5.91x | 8,656 | 7mo | category Memory management, category Rust patterns | compare |
| zerovec-derive Pulled in | 2,561,390 | 4.00x | 6 | 2d | category Memory management, category No standard library | compare |
| zerovec Pulled in | 2,516,803 | 3.93x | 60 | 2d | category Memory management, category No standard library | compare |
| lazy_static Foundational | 2,449,997 | 3.83x | 10,953 | 23d | category Memory management, category No standard library | compare |
| bumpalo Established | 1,968,716 | 3.07x | 546 | 5mo | category Memory management, category No standard library | compare |
| thiserror Foundational | 5,048,791 | 7.88x | 75,923 | 31d | category No standard library, category Rust patterns | compare |
| itertools Widely used | 4,545,996 | 7.10x | 8,656 | 4mo | category No standard library, category Rust patterns | compare |
| pin-project-lite Widely used | 3,270,978 | 5.11x | 1,708 | 8mo | category No standard library, category Rust patterns | compare |
How to choose
- Same job, not the same API. Each line is listed because it shares a crates.io category or keyword with id-arena; read its description before you swap.
- More dependents means more answered questions and a smaller chance it disappears.
- Check the last release against how fast you need fixes. For id-arena: is it still maintained?
Rules
Alternatives = tracked crates (top 1000 by downloads) that share a specific crates.io category (2 points each) or keyword (3 points each) with id-arena, most similar first; its own parts (same name prefix) and crates it depends on or that depend on it are left out, because those are companions, not substitutes. Real downloads = quiet-day median, crates.io data Oct 24, 2026. Built when we find 3 or more.
Up next
The closest alternative: Widely used and steady. 3,785,180 real downloads a day.once_cellRust crate. Single assignment cells and lazy values. Real use: 3.8M downloads a day on quiet days; 8,656 crates depend on it.Read it next →Also worth your time