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Semgrep is a widely-used static analysis tool that gives security teams a flexible, rule-based engine for finding vulnerabilities. It’s powerful in the right hands, but that’s the catch. Getting real value out of Semgrep requires writing and maintaining custom rules, tuning for noise, and accepting that pattern matching has limits when it comes to understanding how code actually behaves. Asymptote takes a different approach: AI-native analysis that understands code in context, with no rule authoring required.

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Head-to-Head Comparison

Based on a controlled benchmark across various languages including Python, Java, Golang, and JavaScript.
FeatureDescriptionAsymptoteSemgrep
SQL Injection DetectionCatches string interpolation in raw queriesFoundFound
Cross-Site Scripting (XSS)Detects unsafe use of html_safe and rawFoundFound
Server-Side Request Forgery (SSRF)Identifies unvalidated external requestsFoundFound
Authorization Flaws (IDOR)Missing access control checks on resourcesFoundMissed
User EnumerationDifferent error messages for valid vs. invalid usersFoundMissed
Insecure Token GenerationHardcoded or predictable authentication tokensFoundMissed
Context-Based AnalysisUnderstands how code processes data, not just patternsYesRequires context-aware rules
PR Scan SpeedTime to feedback in pull requestsFast (seconds in PRs)Depends (large rule sets slow processing)
Natural Language PoliciesDefine rules in plain English without a DSLYes (no syntax or YAML required)No (requires syntax, YAML, and pattern knowledge)
Rule MaintenanceOngoing effort to keep detection currentLow (no custom rules needed to start seeing results)Varies (new risks require new rules; updated policies require rule updates)
Supports Pre-Production TestingWhitebox agentic pentesting that actively probes your codebase for exploitable vulnerabilities before changes reach staging or productionYesNo
AI Code Generation SecuritySecurity checks embedded directly into the coding agent workflow as code is writtenInvisible experience, non-blockingBlocks developers in IDE
Codegen Scan SpeedTime from code change to security feedback100s of millisecondsMultiple seconds (high latency)

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Why It Matters

Semgrep’s pattern-matching model means it can only find what its rules are explicitly written to find. Authorization flaws, business logic issues, and context-dependent vulnerabilities (the kinds of bugs that cause real breaches) often don’t fit neatly into a pattern. Writing rules for them is time-consuming, and keeping them accurate as the codebase evolves is an ongoing maintenance burden. Asymptote understands the intent of your code. It doesn’t need a rule for every vulnerability class because it reasons about how data flows and how access is controlled, the same way a security engineer would during a manual review.