Decision Workspace
mmdb vs fjall vs pickledb
Side-by-side comparison of Rust crates
59
mmdb
stablev3.2.4
The storage engine behind vsdb — a pure-Rust LSM-Tree key-value store
64
fjall
stablev3.1.4
Log-structured, embeddable key-value storage engine
52
pickledb
growingv0.5.1
A lightweight and simple key-value store written in Rust, heavily inspired by Python's PickleDB (https://pythonhosted.org/pickleDB/)
Core Metrics
| mmdb | fjall | pickledb | |
|---|---|---|---|
| Health Score | 59 | 64 | 52 |
| Total Downloads | 26.7K | 1.0M | 1.8M |
| 30d Downloads | 6.4K | 171.2K | 98.8K |
| Dependents | 17 | 897 | 789 |
| Releases | 28 | 94 | 7 |
| Last Updated | 30d ago | 41d ago | 1491d ago |
| Age | 1y 12m | 2y 5m | 7y 4m |
Health Breakdown
mmdb
Maintenance
17
Quality
12
Community
10
Popularity
5
Documentation
15
fjall
Maintenance
16
Quality
15
Community
14
Popularity
7
Documentation
12
pickledb
Maintenance
3
Quality
16
Community
14
Popularity
7
Documentation
12
Technical Details
| mmdb | fjall | pickledb | |
|---|---|---|---|
| Version | 3.2.4 | 3.1.4 | 0.5.1 |
| Stable (≥1.0) | ✓ Yes | ✓ Yes | ✗ No |
| License | MIT | MIT OR Apache-2.0 | MIT |
| Dependencies | 13 | 12 | 9 |
| Crate Size | 205KB | 82KB | 27KB |
| Features | 2 | 5 | 5 |
| Yanked % | 67.9% | 41.5% | 0.0% |
| Edition | 2024 | 2021 | 2018 |
| MSRV | 1.89 | 1.90.0 | — |
| Owners | 2 | 1 | 1 |
Links
Quick Verdict
- •fjall leads with a health score of 64/100, but none of the options score above 80.
- •pickledb has the most downloads (1.8M), suggesting wider adoption.
- •fjall is depended on by 897 crates — strongest ecosystem trust.
- •⚠ pickledb has not been updated in over a year.
- •pickledb is pre-1.0 — API may change.