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Head-to-head · AI Security Testing Tools

PromptGuard vs Crucible

  • Updated Oct 2026
  • Both researched from official sources
  • 6 checks side by side
Higher score PromptGuard #1 in AI Security Testing Tools 9.3/10 Free plan Free plan✓ 5 of 5 features Visit PromptGuard
Crucible #8 in AI Security Testing Tools 8.4/10 Free plan Free plan✓ 4 of 5 features Visit Crucible

PromptGuard leads on 0 checks, Crucible on 0, and 6 are even. Who comes out ahead on the 6 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scorePromptGuard · 9.3/10
  • Free planboth
  • Most featuresPromptGuard · 5 of 5

PromptGuard scores higher on our rubric for ai security testing tools: 9.3 against 8.4 out of 10; our editors rank them #1 and #8.

On deployment mode, PromptGuard gives you Both where Crucible offers Self_hosted.

PromptGuard is the better fit for teams wanting broad, affordable red teaming. Crucible is the better fit for agent teams testing complex attack lifecycles.

  • PromptGuard fits best

    Teams wanting broad, affordable red teaming

  • Crucible fits best

    Agent teams testing complex attack lifecycles

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Side by side

Feature PromptGuard 9.3/10 Visit ↗ Crucible 8.4/10 Visit ↗
At a glance
Editor score 9.3 8.4
Ranking #1 in AI Security Testing Tools #8 in AI Security Testing Tools
Best for Teams wanting broad, affordable red teaming Agent teams testing complex attack lifecycles
Pricing model Free plan + paid Free plan + paid
Starting price $19/seat/mo —
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted, Desktop, Browser extension Self-hosted
Support Email, Community, Docs Community, Docs
Integrations 12 integrations 6 integrations
Built for Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features PromptGuard 5/5 · Crucible 4/5
Prompt injection tests ✓ ✓
Jailbreak tests ✓ ✓
Data leakage tests ✓ (best) Not checked yet
Unsafe output tests ✓ ✓
Custom test cases ✓ ✓
Specs
Deployment mode Both Self_hosted
Our review
Pros
  • 20+ attack vectors plus custom and fuzzed adversarial variants
  • CI/CD regression testing, security grades, and vulnerability reports
  • Web, desktop, browser extension, API, and self-hosted deployment
  • 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
  • Free plan limits usage to 20,000 scans per month and one API key
  • Advanced capabilities are concentrated in paid and higher-tier plans
  • Premium offers no listed feature highlights
  • 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

PromptGuard is an AI security platform for teams testing and protecting applications that use large language models. It sits between applications and LLM providers to detect prompt injection, jailbreak attempts, PII exposure, data…

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. PromptGuardAI Security Testing Tools 9.3Free plan
  2. CrucibleAI Security Testing Tools 8.4Free plan

Strengths and trade-offs

  • PromptGuard — where it wins

    • 20+ attack vectors plus custom and fuzzed adversarial variants
    • CI/CD regression testing, security grades, and vulnerability reports
    • Web, desktop, browser extension, API, and self-hosted deployment

    Where it doesn't

    • Free plan limits usage to 20,000 scans per month and one API key
    • Advanced capabilities are concentrated in paid and higher-tier plans
    • Premium offers no listed feature highlights

  • 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