Decision Workspace
empyrean-sys vs lean-rs-sys vs simavr-ffi
Side-by-side comparison of Rust crates
54
empyrean-sys
experimentalv0.8.2
Low-level FFI bindings to the libempyrean astrodynamics C ABI. For an ergonomic Rust API, use the empyrean crate.
58
lean-rs-sys
experimentalv0.3.0
Raw FFI bindings for the Lean 4 C ABI. See `lean-rs` for the safe front door.
52
simavr-ffi
stablev1.2.6
Low-level bindings to simavr
Core Metrics
| empyrean-sys | lean-rs-sys | simavr-ffi | |
|---|---|---|---|
| Health Score | 54 | 58 | 52 |
| Total Downloads | 331 | 1.0K | 12.1K |
| 30d Downloads | 0 | 0 | 0 |
| Dependents | 10 | 80 | 14 |
| Releases | 10 | 26 | 13 |
| Last Updated | 1d ago | 24d ago | 41d ago |
| Age | 20d | 1m | 4y 1m |
Health Breakdown
empyrean-sys
Maintenance
14
Quality
13
Community
9
Popularity
3
Documentation
15
lean-rs-sys
Maintenance
12
Quality
16
Community
11
Popularity
4
Documentation
15
simavr-ffi
Maintenance
15
Quality
16
Community
6
Popularity
5
Documentation
10
Technical Details
| empyrean-sys | lean-rs-sys | simavr-ffi | |
|---|---|---|---|
| Version | 0.8.2 | 0.3.0 | 1.2.6 |
| Stable (≥1.0) | ✗ No | ✗ No | ✓ Yes |
| License | BSD-3-Clause | MIT OR Apache-2.0 | MIT |
| Dependencies | 6 | 4 | 5 |
| Crate Size | 75KB | 44KB | 3.9MB |
| Features | 0 | 5 | 0 |
| Yanked % | 0.0% | 0.0% | 0.0% |
| Edition | 2024 | 2024 | 2021 |
| MSRV | 1.90.0 | 1.91 | — |
| Owners | 1 | 1 | 1 |
Links
Quick Verdict
- •lean-rs-sys leads with a health score of 58/100, but none of the options score above 80.
- •simavr-ffi has the most downloads (12.1K), suggesting wider adoption.
- •empyrean-sys, lean-rs-sys are pre-1.0 — API may change.