Is Tampermonkey Safe?
Tampermonkey is a Chrome extension with a Nerq Trust Score of 61.8/100 (C+). It is below the recommended threshold of 70. Security: 90/100. Popularity: 90/100. Data sourced from Chrome Web Store metadata, permissions analysis, developer verification, and update history. Last updated: 2026-03-23. Machine-readable data (JSON).
Is Tampermonkey safe?
CAUTION — Tampermonkey has a Nerq Trust Score of 61.8/100 (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.
Trust Score Breakdown
Key Findings
Details
| Author | Unknown |
| Category | chrome |
| Source | N/A |
Safety Guide: Tampermonkey
What is Tampermonkey?
Tampermonkey is a Chrome extension — Userscript manager for custom JavaScript injection. Most popular userscript manager for Chrome..
How to Verify Safety
Review permissions carefully. 'Read all data on all websites' is high risk.
You can also check the trust score via API: GET /v1/preflight?target=Tampermonkey
Key Safety Concerns for Chrome extensions
When evaluating any Chrome extension, watch for: excessive permissions, data harvesting, permission creep.
Trust Assessment
Tampermonkey has a Nerq Trust Score of 62/100 (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
- Tampermonkey has a Trust Score of 62/100 (C+).
- Review carefully before use — below trust threshold.
- Always verify independently using the Nerq API.
Detailed Score Analysis
| Dimension | Score |
|---|---|
| Security | 90/100 |
| Privacy | 90/100 |
| Reliability | 90/100 |
| Transparency | 60/100 |
| Maintenance | 60/100 |
Based on 5 dimensions. Data from Chrome Web Store metadata, permissions analysis, developer verification, and update history.
What data does Tampermonkey collect?
Tampermonkey has a privacy score of 90/100. Review the documentation and privacy policy for data handling details.
Full analysis: Tampermonkey Privacy Report · Privacy review
Is Tampermonkey secure?
Security score: 90/100. This meets the recommended security threshold for production use.
Nerq monitors this entity against NVD, OSV.dev, and registry-specific vulnerability databases for ongoing security assessment.
Full analysis: Tampermonkey Security Report
How we calculated this score
Tampermonkey's trust score of 61.8/100 (C+) is computed from Chrome Web Store metadata, permissions analysis, developer verification, and update history. The score reflects 5 independent dimensions: security (90/100), privacy (90/100), reliability (90/100), transparency (60/100), maintenance (60/100). Each dimension is weighted equally to produce the composite trust score.
Nerq analyzes over 1.8 million software entities across 18 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 23, 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.