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Head-to-head · AI Security Testing Tools

Promptfoo vs Crucible

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Promptfoo #5 in AI Security Testing Tools 8.7/10 Free plan Free plan✓ 0 of 5 features Visit Promptfoo
Crucible #8 in AI Security Testing Tools 8.4/10 Free plan Free plan✓ 4 of 5 features Visit Crucible

Promptfoo leads on 0 checks, Crucible on 0, and 5 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scorePromptfoo · 8.7/10
  • Free planboth
  • Most featuresCrucible · 4 of 5

Promptfoo scores higher on our rubric for ai security testing tools: 8.7 against 8.4 out of 10; our editors rank them #5 and #8.

Promptfoo is the better fit for developers building evaluation into CI/CD. Crucible is the better fit for agent teams testing complex attack lifecycles.

  • Promptfoo fits best

    Developers building evaluation into CI/CD

  • Crucible fits best

    Agent teams testing complex attack lifecycles

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Side by side

Feature Promptfoo 8.7/10 Visit ↗ Crucible 8.4/10 Visit ↗
At a glance
Editor score 8.7 8.4
Ranking #5 in AI Security Testing Tools #8 in AI Security Testing Tools
Best for Developers building evaluation into CI/CD Agent teams testing complex attack lifecycles
Pricing model Free plan + paid Free plan + paid
Starting price — —
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted Self-hosted
Support Community, Docs Community, Docs
Integrations 12 integrations 6 integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Promptfoo 0/5 · Crucible 4/5
Prompt injection tests Not checked yet ✓ (best)
Jailbreak tests Not checked yet ✓ (best)
Data leakage tests Not checked yet Not checked yet
Unsafe output tests Not checked yet ✓ (best)
Custom test cases Not checked yet ✓ (best)
Specs
Deployment mode Not checked yet Self_hosted
Our review
Pros
  • Open-source Community plan includes all LLM evaluation features
  • Automated red teaming, vulnerability scanning, and CI/CD quality gates
  • Supports web, API, and self-hosted deployments with broad integrations
  • 153 attack vectors across 11 modules in the Community plan
  • Covers prompt injection, jailbreaks, MCP abuse, and poisoning attacks
  • JSON and HTML reports with severity findings and OWASP mappings
Cons
  • Enterprise and On-Premise pricing is custom
  • Advanced collaboration and monitoring require a paid tier
  • The product is focused on AI application testing rather than general security
  • Team features are listed as Early Access
  • Hosted dashboards are upcoming or early-access functionality
  • Enterprise pricing is custom rather than publicly stated
Our verdict

Promptfoo is an open-source CLI and library for evaluating, testing, and red-teaming large-language-model applications. It is aimed at developers and teams building AI applications who need to benchmark prompts, models, and RAG pipelines,…

Read the review →

Crucible is an open-source Python CLI for testing AI agents before production. It runs adversarial payloads against HTTP or MCP-accessible agents, covering prompt injection, jailbreaks, unsafe content, tool misuse, memory poisoning, MCP…

Read the review →
  1. PromptfooAI Security Testing Tools 8.7Free plan
  2. CrucibleAI Security Testing Tools 8.4Free plan

Strengths and trade-offs

  • Promptfoo — where it wins

    • Open-source Community plan includes all LLM evaluation features
    • Automated red teaming, vulnerability scanning, and CI/CD quality gates
    • Supports web, API, and self-hosted deployments with broad integrations

    Where it doesn't

    • Enterprise and On-Premise pricing is custom
    • Advanced collaboration and monitoring require a paid tier
    • The product is focused on AI application testing rather than general security

  • Crucible — where it wins

    • 153 attack vectors across 11 modules in the Community plan
    • Covers prompt injection, jailbreaks, MCP abuse, and poisoning attacks
    • JSON and HTML reports with severity findings and OWASP mappings

    Where it doesn't

    • Team features are listed as Early Access
    • Hosted dashboards are upcoming or early-access functionality
    • Enterprise pricing is custom rather than publicly stated

More comparisons

All AI security testing tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update