Is Once Cell Safe?
Once Cell — Nerq Trust Score 63.2/100 (C+ grade). Based on analysis of 2 trust dimensions, it is generally safe but has some concerns. Last updated: 2026-03-31.
Use Once Cell with some caution. Once Cell is a Rust crate with a Nerq Trust Score of 63.2/100 (C+), based on 3 independent data dimensions. It is below the recommended threshold of 70. Security: 90/100. Popularity: 100/100. Data sourced from crates.io registry, GitHub, NVD, and RustSec advisory database. Last updated: 2026-03-31. Machine-readable data (JSON).
Is Once Cell safe?
CAUTION — Once Cell has a Nerq Trust Score of 63.2/100 (C+). It has moderate trust signals but shows some areas of concern that warrant attention. Suitable for development use — review security and maintenance signals before production deployment.
What is Once Cell's trust score?
Once Cell has a Nerq Trust Score of 63.2/100, earning a C+ grade. This score is based on 2 independently measured dimensions including security, maintenance, and community adoption.
What are the key security findings for Once Cell?
Once Cell's strongest signal is popularity at 100/100. No known vulnerabilities have been detected. It has not yet reached the Nerq Verified threshold of 70+.
What is Once Cell and who maintains it?
| Author | Unknown |
| Category | crates |
| Source | N/A |
Similar Crates by Trust Score
Safety Guide: Once Cell
What is Once Cell?
Once Cell is a Rust crate — Single assignment cells and lazy values..
How to Verify Safety
Run cargo audit. Review on crates.io for activity.
You can also check the trust score via API: GET /v1/preflight?target=once_cell
Key Safety Concerns for Rust crates
When evaluating any Rust crate, watch for: dependency vulnerabilities, unsafe code, maintenance status.
Trust Assessment
Once Cell has a Nerq Trust Score of 63/100 (C+) and has not yet reached Nerq trust threshold (70+). This score is based on automated analysis of security, maintenance, community, and quality signals.
Key Takeaways
- Once Cell has a Trust Score of 63/100 (C+).
- Review carefully before use — below trust threshold.
- Always verify independently using the Nerq API.
Detailed Score Analysis
| Dimension | Score |
|---|---|
| Security | 90/100 |
| Privacy | 80/100 |
| Reliability | 90/100 |
| Transparency | 50/100 |
| Maintenance | 60/100 |
Based on 5 dimensions. Data from crates.io registry, GitHub, NVD, and RustSec advisory database.
What data does Once Cell collect?
Once Cell is a Rust crate maintained by Unknown. It receives approximately 768,572,454 weekly downloads.
As a development package, Once Cell does not directly collect end-user personal data. However, applications built with it may collect data depending on implementation. Privacy score: 80/100.
Review the package's dependencies for potential supply chain risks. Run your package manager's audit command regularly.
Full analysis: Once Cell Privacy Report · Privacy review
Is Once Cell secure?
Security score: 90/100. Once Cell has 0 known vulnerabilities (CVEs) in the National Vulnerability Database. This is a clean record.
License information not available. Open-source packages allow independent security review of the source code.
Run your package manager's audit command (`npm audit`, `pip audit`, `cargo audit`) to check for known vulnerabilities in your dependency tree.
Full analysis: Once Cell Security Report
How we calculated this score
Once Cell's trust score of 63.2/100 (C+) is computed from crates.io registry, GitHub, NVD, and RustSec advisory database. The score reflects 5 independent dimensions: security (90/100), privacy (80/100), reliability (90/100), transparency (50/100), maintenance (60/100). Each dimension is weighted equally to produce the composite trust score.
Nerq analyzes over 7.5 million entities across 26 registries using the same methodology, enabling direct cross-entity comparison. Scores are updated continuously as new data becomes available.
This page was last reviewed on March 31, 2026. Data version: 1.0.
Full methodology documentation · Machine-readable data (JSON API)
Frequently Asked Questions
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Disclaimer: Nerq trust scores are automated assessments based on publicly available signals. They are not endorsements or guarantees. Always conduct your own due diligence.