Decision Workspace
fixed_free_list vs slotmap vs slotmapd
Side-by-side comparison of Rust crates
52
fixed_free_list
growingv0.4.0
A fixed-size free-list with optional key lifetime safety and macroless unique typing.
59
slotmap
growingv1.1.1
Slotmap data structure
48
slotmapd
growingv1.0.11
orlp/slotmap fork where serialization cycle doesn't change observable behavior
Core Metrics
| fixed_free_list | slotmap | slotmapd | |
|---|---|---|---|
| Health Score | 52 | 59 | 48 |
| Total Downloads | 2.9K | 60.9M | 59.7K |
| 30d Downloads | 23 | 5.5M | 1.3K |
| Dependents | 0 | 4.0K | 2 |
| Releases | 4 | 21 | 6 |
| Last Updated | 19d ago | 111d ago | 618d ago |
| Age | 3y 4m | 7y 9m | 2y 7m |
Health Breakdown
fixed_free_list
Maintenance
15
Quality
17
Community
6
Popularity
4
Documentation
10
slotmap
Maintenance
10
Quality
15
Community
15
Popularity
8
Documentation
11
slotmapd
Maintenance
4
Quality
21
Community
7
Popularity
6
Documentation
10
Technical Details
| fixed_free_list | slotmap | slotmapd | |
|---|---|---|---|
| Version | 0.4.0 | 1.1.1 | 1.0.11 |
| Stable (≥1.0) | ✗ No | ✓ Yes | ✓ Yes |
| License | MIT OR Apache-2.0 | Zlib | Zlib |
| Dependencies | 1 | 7 | 6 |
| Crate Size | 12KB | 62KB | 57KB |
| Features | 2 | 3 | 3 |
| Yanked % | 0.0% | 71.4% | 0.0% |
| Edition | 2024 | 2018 | 2021 |
| MSRV | — | 1.58.0 | — |
| Owners | 1 | 1 | 1 |
Links
Quick Verdict
- •slotmap leads with a health score of 59/100, but none of the options score above 80.
- •slotmap is depended on by 4.0K crates — strongest ecosystem trust.
- •⚠ slotmapd has not been updated in over a year.
- •fixed_free_list is pre-1.0 — API may change.