Best SAST tools for polyglot monorepos

Combined ranking

1. 1
   Semgrepsemgrep.dev ↗—10 pts

   Claude #1Gemini #1

   Best fit for polyglot monorepos on real merit — 30+ languages under one rule syntax, fast per-file scanning that parallelizes cleanly in monorepo CI, cross-file/cross-function taint analysis in the Pro engine, and rules-as-code that lives in the repo so security and dev teams iterate like on any other code; the open-source engine alone is genuinely useful, and the commercial tier adds dataflow depth without changing workflow. Assumption: the typical practitioner values low false-positive rates and diff-aware CI speed over maximal rule breadth.

   + model takes & fixes− hide details

   Claude Best fit for polyglot monorepos on real merit — 30+ languages under one rule syntax, fast per-file scanning that parallelizes cleanly in monorepo CI, cross-file/cross-function taint analysis in the Pro engine, and rules-as-code that lives in the repo so security and dev teams iterate like on any other code; the open-source engine alone is genuinely useful, and the commercial tier adds dataflow depth without changing workflow. Assumption: the typical practitioner values low false-positive rates and diff-aware CI speed over maximal rule breadth.

   Gemini Fast, build-free AST-based scanning that allows near-instant PR-level feedback. In a near-tie with Snyk Code for developer velocity, Semgrep wins on its open-source core and the ease of writing custom rules for proprietary internal APIs. It natively supports logical subdirectory splitting and diff-aware scanning to prevent CI bottlenecks.

   Where it falls short

   per Claude The deepest interprocedural/cross-file analysis is gated behind the paid Pro engine, and its 2024 license change limits how the community edition's rules can be used in competing products — pure-OSS shops get a meaningfully shallower tool.

   per Gemini Lacks deep inter-procedural taint analysis across directory boundaries or multiple services, making it less effective at tracing complex data flows.

2. 2
   CodeQLgithub.com ↗—8 pts

   Claude #2Gemini #2

   The strongest deep dataflow analysis available at scale — CodeQL's semantic, query-based approach finds real taint-flow vulnerabilities other tools miss, covers the mainstream monorepo languages (Java, JS/TS, Python, Go, C/C++, C#, Ruby, Swift, Kotlin), and since the standalone GHAS Code Security SKU it's buyable without the full bundle; free for public repos. Near-tie with Semgrep — CodeQL wins on analysis depth, Semgrep on speed, language breadth, and rule authoring, and monorepo build orchestration tips it to #2.

   + model takes & fixes− hide details

   Claude The strongest deep dataflow analysis available at scale — CodeQL's semantic, query-based approach finds real taint-flow vulnerabilities other tools miss, covers the mainstream monorepo languages (Java, JS/TS, Python, Go, C/C++, C#, Ruby, Swift, Kotlin), and since the standalone GHAS Code Security SKU it's buyable without the full bundle; free for public repos. Near-tie with Semgrep — CodeQL wins on analysis depth, Semgrep on speed, language breadth, and rule authoring, and monorepo build orchestration tips it to #2.

   Gemini The gold standard for deep semantic and data-flow analysis, allowing developers to trace complex vulnerabilities across multiple files. Integrates natively with GitHub Advanced Security. Custom queries can be written in QL to enforce complex rules.

   Where it falls short

   per Claude Slow, build-dependent scans that fight large monorepos (compiled-language extraction needs a working build per language), and it's only economical if you're already on GitHub — GitLab/self-hosted shops pay a steep integration tax.

   per Gemini Extremely resource-heavy and slow scan times; for compiled languages, it requires a successful build of the project, which is difficult to orchestrate in a complex, multi-language monorepo.

3. 3
   Checkmarx Onecheckmarx.com ↗incumbent—4 pts

   Claude #3Gemini #5

   The strongest traditional enterprise SAST for breadth — ~35 languages including legacy stacks (COBOL-adjacent, PL/SQL, Scala, Apex) that Semgrep and CodeQL skip, scans without a full build, and mature triage/policy tooling that suits large orgs where one monorepo spans a dozen teams and compliance regimes. Assumption: the buyer is an enterprise AppSec team, not a startup.

   + model takes & fixes− hide details

   Claude The strongest traditional enterprise SAST for breadth — ~35 languages including legacy stacks (COBOL-adjacent, PL/SQL, Scala, Apex) that Semgrep and CodeQL skip, scans without a full build, and mature triage/policy tooling that suits large orgs where one monorepo spans a dozen teams and compliance regimes. Assumption: the buyer is an enterprise AppSec team, not a startup.

   Gemini Multi-scanner correlation (SAST, SCA, IaC) that consolidates findings into a single enterprise dashboard. Highly scalable for large organizations requiring unified governance and strict compliance reporting.

   Where it falls short

   per Claude Expensive, sales-driven procurement and a historically high false-positive volume that demands dedicated triage staff — a small team without an AppSec function will drown in findings.

   per Gemini High licensing cost and slow, heavy scanning engine that is difficult to integrate into rapid, developer-centric feedback loops on every pull request.

4. 4
   SonarQubesonarsource.com ↗incumbent—4 pts

   Claude #4Gemini #4

   Ubiquitous, self-hostable, ~30 languages in one scanner, and its taint analysis (Developer edition and up) has improved into a credible security tool layered on best-in-class code-quality gates; for teams that want one dashboard for quality plus security across a polyglot monorepo it's the pragmatic pick, and the free Community Build still covers a lot.

   + model takes & fixes− hide details

   Claude Ubiquitous, self-hostable, ~30 languages in one scanner, and its taint analysis (Developer edition and up) has improved into a credible security tool layered on best-in-class code-quality gates; for teams that want one dashboard for quality plus security across a polyglot monorepo it's the pragmatic pick, and the free Community Build still covers a lot.

   Gemini Broad coverage across 30+ languages with clean PR decoration and Quality Gates. Excellent integration with modern CI/CD tools and supports splitting a monorepo into separate logical projects under distinct keys to mirror internal ownership boundaries.

   Where it falls short

   per Claude Security depth trails the leaders — its taint engine finds the well-trodden injection classes but misses subtler flows CodeQL catches, and monorepo support (project-per-component setup) is clunky enough that people write tooling around it.

   per Gemini Treats sub-projects as completely isolated entities, offering no cross-project dependency or data-flow analysis, and configuring incremental scans for changed directories requires manual CI pipeline orchestration.

5. 5
   Snyk Codesnyk.io ↗incumbent—3 pts

   Claude —Gemini #3

   Fast, build-free engine leveraging machine learning models alongside semantic analysis. Excellent developer workflow integration (IDE, PR comments). Workspaces support allows repository cloning to bypass SCM API rate limits when dealing with very large repositories.

   + model takes & fixes− hide details

   Gemini Fast, build-free engine leveraging machine learning models alongside semantic analysis. Excellent developer workflow integration (IDE, PR comments). Workspaces support allows repository cloning to bypass SCM API rate limits when dealing with very large repositories.

   Where it falls short

   per Gemini Closed-source engine that does not allow teams to easily write or customize rules, making it impossible to enforce custom, monorepo-specific secure coding standards.

6. 6
   OOpengrep—1 pts

   Claude #5Gemini —

   The Linux Foundation-backed fork of Semgrep's community engine (launched 2025 by Aikido, Endor Labs, Orca and others) restores the pre-license-change open terms and keeps a genuinely free, fast, multi-language pattern engine viable for monorepos — the right pick for teams that want Semgrep-style scanning with no vendor strings. Ranked on merit for the OSS-only practitioner; flagged near-tie with SonarQube for that audience.

   + model takes & fixes− hide details

   Claude The Linux Foundation-backed fork of Semgrep's community engine (launched 2025 by Aikido, Endor Labs, Orca and others) restores the pre-license-change open terms and keeps a genuinely free, fast, multi-language pattern engine viable for monorepos — the right pick for teams that want Semgrep-style scanning with no vendor strings. Ranked on merit for the OSS-only practitioner; flagged near-tie with SonarQube for that audience.

   Where it falls short

   per Claude Young project without Semgrep's Pro dataflow engine or curated commercial ruleset — you get pattern matching and community rules, not deep interprocedural taint analysis, and long-term maintenance cadence is still proving out.

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Tracked by ModelsAgree · rank 1 = 5 pts … rank 5 = 1 pt · re-polled weekly