Decision Workspace
fstr vs fixed_str vs flat_string
Side-by-side comparison of Rust crates
65
fstr
growingv0.2.22
A stack-allocated fixed-length string type
47
fixed_str
growingv0.9.1
Fixed-size, null-padded UTF-8 string type with const-safe construction and binary serialization support.
59
flat_string
stablev1.1.0
FlatString is a fixed-size String that can be created directly on the stack.
Core Metrics
| fstr | fixed_str | flat_string | |
|---|---|---|---|
| Health Score | 65 | 47 | 59 |
| Total Downloads | 392.0K | 2.1K | 5.8K |
| 30d Downloads | 15.6K | 0 | 0 |
| Dependents | 116 | 3 | 34 |
| Releases | 35 | 2 | 4 |
| Last Updated | 35d ago | 475d ago | 16d ago |
| Age | 3y 7m | 1y 3m | 1y 7m |
Health Breakdown
fstr
Maintenance
17
Quality
14
Community
12
Popularity
7
Documentation
15
fixed_str
Maintenance
6
Quality
17
Community
8
Popularity
4
Documentation
12
flat_string
Maintenance
15
Quality
20
Community
10
Popularity
4
Documentation
10
Technical Details
| fstr | fixed_str | flat_string | |
|---|---|---|---|
| Version | 0.2.22 | 0.9.1 | 1.1.0 |
| Stable (≥1.0) | ✗ No | ✗ No | ✓ Yes |
| License | Apache-2.0 | MIT OR Apache-2.0 | MIT |
| Dependencies | 2 | 5 | 0 |
| Crate Size | 17KB | 27KB | 9KB |
| Features | 4 | 6 | 0 |
| Yanked % | 8.6% | 0.0% | 0.0% |
| Edition | 2024 | 2021 | 2021 |
| MSRV | 1.85 | 1.60 | — |
| Owners | 1 | 1 | 1 |
Links
Quick Verdict
- •fstr leads with a health score of 65/100, but none of the options score above 80.
- •fstr is depended on by 116 crates — strongest ecosystem trust.
- •⚠ fixed_str has not been updated in over a year.
- •fstr, fixed_str are pre-1.0 — API may change.