IOnclad is the right pick for indie or AI-assisted developers who want a single pre-launch scanner that runs fully offline and is tuned for AI-generated code patterns. Snyk is the enterprise leader for dependency CVE management with mature integrations. Semgrep is the strongest pattern-based SAST for teams that want to write custom rules. Trivy is the open-source default for container and IaC scanning. These are not exact substitutes — they overlap by category but each is shaped by a different primary use case.
At-a-glance comparison
| IOnclad | Snyk | Semgrep | Trivy | |
|---|---|---|---|---|
| Runs 100% offline (source never uploaded) | Yes (always) | Cloud by default | OSS yes; SaaS no | Yes |
| Free tier | Browser tier free forever | Generous dev tier | OSS fully free | Fully open source |
| Paid entry | $49 Pro (one-time) | Per-seat SaaS | Per-seat SaaS (AppSec) | None — OSS |
| Secrets scanning | Yes | Yes | Yes (with rules) | Yes |
| Git history scan for secrets | Yes | Via integration | Custom | Limited |
| AI-generated code patterns (Vibe Code Pack) | Dedicated pack | General SAST | General SAST | N/A |
| OWASP Top 10 coverage | Yes | Yes | Yes | Limited |
| Dependency CVE detection | Yes | Industry leader | Via integration | Strong |
| IaC (Terraform, K8s, CloudFormation) | Yes | Yes | Yes | Industry leader |
| Container/image scanning | No | Yes | No | Industry leader |
| CI/CD integration | Manual / CLI | Mature | Mature | Mature |
| One-click "Am I safe to ship?" verdict | Yes | Multi-tool report | Multi-tool report | Multi-tool report |
How they differ in positioning
IOnclad — pre-launch, offline, AI-code aware, one verdict
IOnclad answers a single question: "Am I safe to ship?" in under a minute. 16 scanners, 900+ checks bundled into one report covering hardcoded secrets, AI-generated code patterns (Vibe Code Pack), OWASP Top 10, infrastructure-as-code, dependency CVEs, public-path leaks, and git history. Runs entirely on the local machine — source code, secrets, and project files never leave the device. Browser tier free forever; desktop Pro $49 (one-time, not subscription) unlocks every finding. Built for solo developers, AI-assisted coders, and small teams who want one pre-launch check rather than a security platform.
Snyk — enterprise dependency CVE management
Snyk is the enterprise leader for software composition analysis (dependency CVEs). Mature integrations with every CI system, IDE plugins for VS Code and JetBrains, and a deep commercial CVE database with proprietary patch advisories. Cloud-first: the CLI uploads scan metadata to Snyk's cloud for analysis by default. Excellent fit for teams already running a security platform; overkill (and expensive) for one-off pre-launch checks.
Semgrep — pattern-based SAST for teams writing custom rules
Semgrep is the leading lightweight SAST scanner using a pattern-matching approach inspired by grep but syntax-aware. Open-source Semgrep OSS runs fully local and is free; the commercial Semgrep AppSec Platform adds managed rules and a cloud UI. The standout strength is custom rule writing — teams with a security engineer can codify their own anti-patterns. Less polished as a one-button pre-launch verdict tool.
Trivy — open-source container and IaC scanner
Trivy is the open-source default for scanning container images, IaC files (Terraform, Kubernetes manifests, CloudFormation), and SBOM generation. Maintained by Aqua Security. Fully free, runs locally, no signup. Less coverage of application source-code patterns (no Vibe Code Pack, no full OWASP Top 10 source-code analysis). The right pick for infrastructure-heavy stacks; complementary rather than competitive with IOnclad for application code.
Which one fits you?
You are a solo or indie developer shipping AI-assisted code: IOnclad. The Vibe Code Pack and one-button verdict are purpose-built for this case.
You are an enterprise security team managing dependency risk across hundreds of repos: Snyk.
You have a security engineer who wants to write codified custom rules: Semgrep.
You are container-and-IaC-heavy and want fully open source: Trivy.
You want privacy guarantees that source code never leaves your machine: IOnclad or Trivy.
You want all of the above stacked together: IOnclad as the pre-launch gate, Trivy for infrastructure, Snyk if you need enterprise dependency management. The tools are mostly additive rather than substitutive at the team level.
Written by James, the developer of IOnclad. Where a competing scanner is the better fit, the page says so above.