Decision Workspace
extern-trait vs extern-trait-impl vs downcast-rs
Side-by-side comparison of Rust crates
55
extern-trait
experimentalv0.4.1
Opaque types for traits using static dispatch
46
extern-trait-impl
experimentalv0.4.1
Proc-macro implementation for extern-trait
65
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 | 55 | 46 | 65 |
| Total Downloads | 14.9K | 1.6K | 102.2M |
| 30d Downloads | 3.3K | 1.4K | 7.5M |
| Dependents | 23 | 2 | 4.4K |
| Releases | 6 | 2 | 15 |
| Last Updated | 52d ago | 52d ago | 207d ago |
| Age | 11m | 1m | 10y 3m |
Health Breakdown
extern-trait
Maintenance
16
Quality
14
Community
10
Popularity
5
Documentation
10
extern-trait-impl
Maintenance
11
Quality
14
Community
7
Popularity
4
Documentation
10
downcast-rs
Maintenance
8
Quality
23
Community
14
Popularity
8
Documentation
12
Technical Details
| extern-trait | extern-trait-impl | downcast-rs | |
|---|---|---|---|
| Version | 0.4.1 | 0.4.1 | 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 | 2 | 3 | 0 |
| Crate Size | 14KB | 8KB | 13KB |
| Features | 0 | 0 | 3 |
| Yanked % | 0.0% | 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 65/100, but none of the options score above 80.
- •downcast-rs is depended on by 4.4K crates — strongest ecosystem trust.
- •extern-trait, extern-trait-impl are pre-1.0 — API may change.