Arcjet vs Semgrep
Detailed side-by-side comparison to help you choose the right tool
Arcjet
🔴DeveloperApplication Security
Runtime application security that ships inside your code: bot detection, rate limiting, prompt-injection protection, PII redaction, and email validation as SDK building blocks.
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$0Semgrep
🔴DeveloperApplication Security
Semgrep provides AI-assisted application security capabilities for secure code review.
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CustomFeature Comparison
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Arcjet - Pros & Cons
Pros
- ✓Security policy lives in code, reviewable in pull requests
- ✓Low latency thanks to in-process WebAssembly execution
- ✓First-class primitives for AI-specific risks (prompt injection, PII, spend)
- ✓Generous free tier suitable for early-stage startups
- ✓Strong DX for Next.js and edge/serverless runtimes
Cons
- ✗Library model means each app/service needs the SDK integrated
- ✗Not a drop-in replacement for a full CDN-level WAF
- ✗Smaller IP/bot dataset than incumbents like Cloudflare or Akamai
- ✗Newer product — fewer compliance certifications than legacy WAFs
- ✗No MCP surface yet for agent-driven security operations
Semgrep - Pros & Cons
Pros
- ✓Rules are readable enough for security engineers and developers to review
- ✓Fast local and CI feedback can find issues before production
- ✓Custom rules let teams encode recurring secure-coding requirements
- ✓SAST, dependency, and secrets findings can share one remediation workflow
Cons
- ✗Commercial pricing and exact feature boundaries were not verified
- ✗Custom rules require maintenance as frameworks and coding patterns change
- ✗Broad rulesets can create noisy findings without tuning
- ✗Static analysis cannot prove runtime exploitability or replace penetration testing
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