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The Best Code Security Scanners (SAST)

Semgrep, Snyk Code, SonarQube, CodeQL, and Checkmarx compared on detection, DX, coverage, and cost.

Last updated Jul 3, 2026

Static application security testing (SAST) tools catch vulnerabilities in source code — injection flaws, hardcoded secrets, unsafe deserialization — before they ever reach production. We compared the SAST scanners development and security teams actually deploy, from free open-source engines to enterprise platforms, scoring each on detection accuracy, developer and CI experience, language coverage, and cost. Outbound links are labelled and never change the ranking.

  1. 1

    Semgrep

    Our pick

    A fast, pattern-based SAST scanner with a free open-source engine and readable custom rules.

    8.8
    / 10

    Pros

    • + Free, fast open-source engine with a large community security ruleset
    • + Custom rules are readable and quick to write, so teams can encode their own patterns
    • + Integrates cleanly into CI with low false-positive noise when tuned

    Cons

    • − Deep interprocedural dataflow analysis is reserved for the paid platform tiers
    • − Coverage depth varies by language and ruleset maturity
    • − The managed platform, dashboards, and triage features require a paid plan
    From $0.00
    Visit Semgrep
  2. 2

    Snyk Code

    Best for teams

    A developer-first SAST scanner with fast in-IDE feedback and AI-assisted fixes.

    8.3
    / 10

    Pros

    • + Fast, developer-friendly feedback directly in the IDE and pull requests
    • + AI-assisted fix suggestions speed up remediation
    • + Part of a broader platform covering dependencies and containers, with a usable free tier

    Cons

    • − Advanced features and larger teams require paid per-contributor plans
    • − Proprietary engine, so rules are less transparent than open-source options
    • − Costs can climb quickly as contributor counts grow
    From $0.00 /month
    Visit Snyk Code
  3. 3

    SonarQube

    A self-hosted quality and security platform that adds SAST findings to code-quality gates.

    8.0
    / 10

    Pros

    • + Combines security findings with broader code-quality analysis in one platform
    • + Very broad language coverage with a server dashboard and quality gates
    • + Free self-hostable Community Edition to trial before buying

    Cons

    • − Taint (dataflow) security analysis and branch scanning require paid editions
    • − Self-hosting means running and maintaining a server
    • − Heavier to operate than a single-binary CLI scanner
    From $0.00
    Visit SonarQube
  4. 4

    CodeQL

    Best free

    GitHub's query-based SAST engine that treats code as a database you can query for vulnerabilities.

    8.0
    / 10

    Pros

    • + Deep semantic dataflow and taint analysis that finds high-severity vulnerabilities precisely
    • + Free for public and open-source repositories via GitHub code scanning
    • + Extensive maintained query packs plus the ability to write custom queries

    Cons

    • − Private-repository use requires paid GitHub Advanced Security
    • − Writing custom CodeQL queries has a steep learning curve
    • − Tightly oriented around the GitHub ecosystem
    From $0.00
    Visit CodeQL
  5. 5

    Checkmarx SAST

    An enterprise SAST platform with broad language coverage and deep compliance reporting.

    7.7
    / 10

    Pros

    • + Very broad language and framework coverage suited to large, mixed codebases
    • + Deep analysis with extensive compliance and audit reporting for regulated industries
    • + Mature enterprise governance, integrations, and support

    Cons

    • − Quote-based commercial pricing with no free tier and significant cost
    • − Heavier to deploy, configure, and tune than developer-first scanners
    • − Can produce more false positives that require triage without careful tuning
    Visit Checkmarx SAST

Side-by-side

The Best Code Security Scanners (SAST) — score by criterion for each product.
Product Vulnerability detection accuracy Developer & CI experience Language & framework coverage Pricing & licensing Overall
Semgrep 8.6 9.2 8.8 8.5 8.8
Snyk Code 8.4 9.0 8.2 6.5 8.3
SonarQube 8.0 7.8 9.0 6.0 8.0
CodeQL 9.0 7.5 7.8 6.5 8.0
Checkmarx SAST 8.7 6.5 9.2 4.0 7.7
How we scored this

Each scanner is scored on four weighted criteria: vulnerability detection accuracy (weight 3), developer and CI experience (2), language and framework coverage (2), and pricing and licensing (1). Scores reflect our own assessment from hands-on use, documented capabilities, and each tool's transparency, not vendor-supplied benchmarks. Rankings are editorial and independent of any affiliate relationship.