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Gecko Security

Gecko is an AI code security engineer that reasons across code, infrastructure and intent to find exploitable vulnerabilities, including business logic flaws, and fixes the root cause and every variant in one PR.

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Introduction

Gecko reasons across your code, infrastructure and intent to find the vulnerabilities that actually get exploited, prioritises them from an attacker’s perspective, fixes the root cause and every variant in one pull request, and makes sure they do not come back.

Its focus is business logic flaws and multi-step attack chains that pattern-based tools miss. You can run deep scans or PR checks, scan a ZIP upload or a public repository without connecting anything, and evaluate with ten free scans.

Launch and background: Y Combinator’s company directory lists Gecko Security in its Fall 2024 batch, with the one-liner “Security that understands your company”. Gecko Security was launched on Hacker News on 31 July 2025.

Features

  1. Business-logic detection: Beyond pattern matching.
  2. Attacker prioritisation: Rank by exploitability.
  3. Root-cause fixes: All variants in one PR.
  4. PR checks: Protect every pull request.
  5. ZIP and public repo scans: Try without connecting.

Pros

  1. Free trial: Ten scans on your own code.

Cons

  1. Trial, not free tier: Paid after ten scans.
  2. Code-only: Needs repository access.
  1. Connect a repository and run a deep scan.
  2. Review findings and the proposed root-cause PR.
  3. Enable PR checks.

Resources:

Pricing

Gecko offers 10 free scans as a trial and a team plan at $100 a month for PR security, with higher tiers on request.

  1. Teams worried about logic flaws in fast-growing codebases.

Conclusion

Gecko targets the vulnerabilities SAST tools traditionally miss.

Use the ten free scans on your riskiest repo.

On CheckOps, Gecko Security is filed under the Security testing and Release & CI gates stages. Related tools listed here include Semgrep, Snyk, CodeQL, Checkmarx, Aikido Security and Veracode. Which one fits best depends mostly on your stack, your team’s size and skills, and whether you prefer to run tools yourself or pay for a managed service. This page reflects the official website, documentation and repository as they stood on 11 November 2026.

Alternatives

Other tools on CheckOps that cover similar ground. Open a page, or compare one with Gecko Security side by side.