The best security tools for solo developers in 2026

Solo developers are in a weird spot. You're shipping fast, probably with a lot of AI-generated code, and you don't have a security team looking over your shoulder. You also don't have time to install twelve tools and wire them all into a CI pipeline on day one. What you need is a short list of things that actually catch real problems without eating your afternoon.

Here's what I'd recommend, with honest takes on each.

Secrets scanning: Gitleaks

Hardcoded secrets are still one of the most common ways solo projects get owned. You paste an API key into a test file, forget about it, push to a public repo, and three minutes later a bot has it.

gitleaks scans your git history for secrets, not just your working tree. That distinction matters. A lot.

# Scan your entire repo history
gitleaks detect --source . --verbose

# Or just the staged files before a commit
gitleaks protect --staged

It's free, fast, and runs as a pre-commit hook without much fuss. If you use GitHub, their own secret scanning does catch some things on push, but it only covers a limited set of patterns and you're notified after the fact. Gitleaks runs before you push.

One honest caveat: the false positive rate on certain patterns (UUIDs, base64 blobs) can be annoying. You'll end up with a .gitleaks.toml allowlist file fairly quickly. Worth it anyway.

Dependency auditing: `npm audit` and Renovate

npm audit ships with npm and costs nothing. Run it. It pulls from the npm advisory database and tells you which of your dependencies have known CVEs.

npm audit
npm audit --fix   # applies safe semver-compatible fixes automatically

The fix command is conservative by design. It won't bump a major version without your say-so, which is the right call for production code.

For keeping dependencies fresh over time, Renovate (from Mend, free for open source) opens pull requests automatically when new versions drop. It groups patch updates, respects your semver constraints, and integrates with GitHub, GitLab, and Gitea. I find it less noisy than Dependabot, though both do the job.

SAST: Semgrep

Semgrep is the go-to for static application security testing at the solo level. It's open source, the rule library is huge, and it runs locally without sending your code anywhere (unless you use the cloud product, which you don't have to).

# Install
pip install semgrep

# Run the default security ruleset
semgrep --config=p/security-audit .

What makes Semgrep practical is that its rules are readable. If a rule fires and you're not sure why, you can actually read the YAML and understand what it's matching. That's rarer than it sounds.

The free tier covers everything you need as a solo dev. The paid cloud tier adds cross-file analysis and a dashboard, which starts to matter more on larger teams.

Container scanning: Trivy

If you're shipping Docker images, Trivy is the tool. It scans images for OS package vulnerabilities, checks your Dockerfile for misconfigurations, and can scan your filesystem or a running container.

# Scan a local image
trivy image myapp:latest

# Scan a Dockerfile for misconfigs
trivy config ./Dockerfile

Trivy is maintained by Aqua Security and updated frequently. The database pulls from multiple upstream feeds. It's fast enough to run in CI without adding meaningful build time.

Repo health and ops hygiene: seaworthycode

None of the tools above will tell you that you've left NODE_ENV=development in your production config, or that you're missing a .gitignore pattern that exposes your .env file, or that your app has no rate limiting on its auth endpoint. That's a different category of problem: not a CVE, just a mistake that gets you.

npx seaworthycode scans your repo for issues across six categories: security, resilience, ops basics, dependency hygiene, configuration, and data exposure. It's aimed specifically at the vibe-coding workflow where you've shipped a lot of AI-generated code and want a second pass before you go live.

npx seaworthycode

It runs in about thirty seconds on most repos and gives you a report you can actually act on. There's a VS Code extension too if you prefer to see findings inline while you work.

What I'd actually do

If I were setting up a new solo project today, the order of operations would be:

Add gitleaks protect --staged as a pre-commit hook immediately
Run npm audit before the first deploy and pipe Renovate into the repo
Drop Semgrep into CI with the security-audit ruleset
Run Trivy on any Docker image before pushing it
Run npx seaworthycode before going public and again after any large batch of AI-generated changes

None of these tools overlap much. Each catches a different class of problem. And all of them are either free or cheap enough that cost isn't a reason to skip them.

Security for solo developers isn't about building a program. It's about closing the obvious gaps before they become incidents. These tools close most of them.

Seaworthy is a static analysis tool for AI-assisted developers that scans repositories for security, configuration, and ops issues across six categories, available via npx seaworthycode or as a VS Code extension.