Decision Workspace
ndd vs conquer-once vs orn
Side-by-side comparison of Rust crates
47
ndd
experimentalv0.2.12
Non De-Duplicated cell. For statics guaranteed not to share memory with any other static/const.
52
conquer-once
growingv0.4.0
Synchronization primitives for lazy and one-time initialization
64
orn
stablev1.0.0
A generic implementation of a sum type (or discriminated union). It provides `enum Or<T1, T2, ..., N>` types as a counterpart to tuples.
Core Metrics
| ndd | conquer-once | orn | |
|---|---|---|---|
| Health Score | 47 | 52 | 64 |
| Total Downloads | 4.3K | 1.2M | 22.8K |
| 30d Downloads | 26 | 78.3K | 812 |
| Dependents | 3 | 185 | 44 |
| Releases | 18 | 9 | 17 |
| Last Updated | 158d ago | 1084d ago | 29d ago |
| Age | 8m | 6y 7m | 2y 5m |
Health Breakdown
ndd
Maintenance
12
Quality
9
Community
10
Popularity
4
Documentation
12
conquer-once
Maintenance
4
Quality
17
Community
12
Popularity
7
Documentation
12
orn
Maintenance
17
Quality
18
Community
11
Popularity
5
Documentation
13
Technical Details
| ndd | conquer-once | orn | |
|---|---|---|---|
| Version | 0.2.12 | 0.4.0 | 1.0.0 |
| Stable (≥1.0) | ✗ No | ✗ No | ✓ Yes |
| License | BSD-2-Clause OR Apache-2.0 OR MIT | MIT/Apache-2.0 | MIT |
| Dependencies | 0 | 1 | 4 |
| Crate Size | 18KB | 16KB | 18KB |
| Features | 0 | 2 | 7 |
| Yanked % | 55.6% | 0.0% | 0.0% |
| Edition | 2024 | 2018 | 2021 |
| MSRV | 1.86 | — | — |
| Owners | 2 | 1 | 1 |
Links
Quick Verdict
- •orn leads with a health score of 64/100, but none of the options score above 80.
- •conquer-once has the most downloads (1.2M), suggesting wider adoption.
- •conquer-once is depended on by 185 crates — strongest ecosystem trust.
- •⚠ conquer-once has not been updated in over a year.
- •ndd, conquer-once are pre-1.0 — API may change.