LLM Guard
★ 4/5 · Security
Free open-source security toolkit for LLM applications providing prompt injection detection, PII redaction, jailbreak detection, and content filtering.
Pros
- Completely free and open-source under MIT license
- Direct and indirect prompt injection detection
- Integrated validators for jailbreaks, invisible text, and PII
- Self-hosted deployment keeps all data in-house
- Over 2.5 million PyPI downloads demonstrating production use.
Cons
- Self-hosted only with no managed service option
- Requires Python 3.10+ and development infrastructure
- Limited graphical interface for non-technical users
- Smaller community than enterprise alternatives.
Cost
Free (MIT open-source)
Verdict
Ideal for development teams and startups needing open-source LLM security who can self-host and prefer avoiding vendor lock-in.
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