Decision Workspace
extern-trait vs extern-trait-impl vs downcast-rs
Side-by-side comparison of Rust crates
58
extern-trait
growingv0.5.0
Opaque types for traits using static dispatch
58
extern-trait-impl
experimentalv0.5.0
Proc-macro implementation for extern-trait
63
downcast-rs
growingv2.0.2
Trait object downcasting support using only safe Rust. It supports type parameters, associated types, and type constraints.
Core Metrics
| extern-trait | extern-trait-impl | downcast-rs | |
|---|---|---|---|
| Health Score | 58 | 58 | 63 |
| Total Downloads | 72.4K | 56.5K | 133.8M |
| 30d Downloads | 8.1K | 7.8K | 5.7M |
| Dependents | 122 | 5 | 4.7K |
| Releases | 9 | 5 | 15 |
| Last Updated | 6d ago | 6d ago | 315d ago |
| Age | 1y 2m | 5m | 10y 7m |
Health Breakdown
extern-trait
Maintenance
19
Quality
11
Community
12
Popularity
6
Documentation
10
extern-trait-impl
Maintenance
19
Quality
15
Community
8
Popularity
6
Documentation
10
downcast-rs
Maintenance
6
Quality
23
Community
14
Popularity
8
Documentation
12
Technical Details
| extern-trait | extern-trait-impl | downcast-rs | |
|---|---|---|---|
| Version | 0.5.0 | 0.5.0 | 2.0.2 |
| Stable (≥1.0) | ✗ No | ✗ No | ✓ Yes |
| License | MIT OR Apache-2.0 | MIT OR Apache-2.0 | MIT OR Apache-2.0 |
| Dependencies | 5 | 3 | 0 |
| Crate Size | 24KB | 11KB | 13KB |
| Features | 1 | 1 | 3 |
| Yanked % | 11.1% | 0.0% | 0.0% |
| Edition | 2024 | 2024 | 2021 |
| MSRV | — | — | 1.56 |
| Owners | 1 | 1 | 1 |
Links
Quick Verdict
- •downcast-rs leads with a health score of 63/100, but none of the options score above 80.
- •downcast-rs is depended on by 4.7K crates — strongest ecosystem trust.
- •extern-trait, extern-trait-impl are pre-1.0 — API may change.