Decision Workspace
schemalint vs rstructor vs onwards
Side-by-side comparison of Rust crates
48
schemalint
experimentalv1.1.0
Static analysis tool for JSON Schema compatibility with LLM structured-output providers
58
rstructor
growingv0.4.0
Get structured, validated data out of LLMs as native Rust structs and enums. Derive a type and rstructor generates the JSON Schema, prompts the model, parses the reply, and retries on validation errors — across OpenAI, Anthropic Claude, Google Gemini, and xAI Grok. The Rust answer to Python's Pydantic + Instructor.
63
onwards
experimentalv0.34.6
A flexible LLM proxy library
Core Metrics
| schemalint | rstructor | onwards | |
|---|---|---|---|
| Health Score | 48 | 58 | 63 |
| Total Downloads | 27 | 4.6K | 12.1K |
| 30d Downloads | 0 | 0 | 634 |
| Dependents | 0 | 14 | 252 |
| Releases | 2 | 28 | 72 |
| Last Updated | 10d ago | 33d ago | 3d ago |
| Age | 10d | 1y 3m | 11m |
Health Breakdown
schemalint
Maintenance
13
Quality
12
Community
6
Popularity
2
Documentation
15
rstructor
Maintenance
17
Quality
15
Community
9
Popularity
4
Documentation
13
onwards
Maintenance
19
Quality
11
Community
13
Popularity
5
Documentation
15
Technical Details
| schemalint | rstructor | onwards | |
|---|---|---|---|
| Version | 1.1.0 | 0.4.0 | 0.34.6 |
| Stable (≥1.0) | ✓ Yes | ✗ No | ✗ No |
| License | MIT OR Apache-2.0 | MIT | MIT |
| Dependencies | 18 | 16 | 41 |
| Crate Size | 144KB | 222KB | 256KB |
| Features | 0 | 11 | 2 |
| Yanked % | 0.0% | 0.0% | 0.0% |
| Edition | 2021 | 2024 | 2024 |
| MSRV | 1.80 | — | 1.88.0 |
| Owners | 1 | 1 | 1 |
Links
Quick Verdict
- •onwards leads with a health score of 63/100, but none of the options score above 80.
- •onwards is depended on by 252 crates — strongest ecosystem trust.
- •rstructor, onwards are pre-1.0 — API may change.