Best Security Scanner for Solo Devs & Indie Hackers (2026)

The best security scanner for a solo dev is the one whose pricing doesn't punish you for working alone, whose false positives don't train you to ignore it, and whose rules fit your stack. For one person shipping Next.js + Supabase, that usually points to a flat per-repo tool over a per-seat platform — but the honest answer depends on what you're building. Below: the buyer's criteria, then a fair comparison of the main options with pricing verified in June 2026.

Most "best scanner" lists are written for security teams at 200-person companies. They rank tools by depth, integration count, and compliance features you'll never touch. As a solo dev your constraints are different, and the tool that wins for a CISO is often the worst fit for you.

What should a solo dev look for in a security scanner?

The right scanner for one person optimizes for four things, roughly in this order: pricing model, false-positive rate, setup time, and stack fit. Depth matters too, but it's downstream — an engine you've muted because it's too noisy, or never bought because it's too expensive, protects nothing.

1. Pricing model — flat beats per-seat. Nearly every commercial scanner prices per developer (or "contributing developer," or "contributor"). That model is built for growing teams and has a quiet edge case: the solo dev. You pay a full seat to scan one repo, and some plans won't sell you fewer than five. A flat per-repo or per-project price is almost always cheaper and more predictable for one person running several apps.

2. False-positive rate — noise is the real enemy. A scanner that cries wolf gets muted, and a muted scanner is worse than none because it gives you false confidence. You have no AppSec teammate to triage a queue of 400 findings. Fewer accurate findings beat a comprehensive firehose every time.

3. Setup time — minutes, not a sprint. You don't have a platform team to wire up a scanner. If onboarding means custom rule configs, baseline tuning, and a 40-page docs site before your first useful result, it won't survive contact with your roadmap. The bar: connect the repo, push code, get a result.

4. Stack fit — generic SAST misses stack-specific footguns. A general static analyzer knows SQL injection and XSS in the abstract. It usually does not know that NEXT_PUBLIC_ inlines a variable into your client bundle, or that a Supabase table without RLS is a fully public API. The most dangerous bugs in a Next.js + Supabase app are framework-specific. We've written deep-dives on the worst offenders: the service_role key reaching the browser and RLS disabled in a migration.

One category note, because no single tool does it all: SAST scans your code for vulnerable patterns, SCA scans dependencies for known CVEs, and secrets detection catches hardcoded keys. Most solo devs need a bit of all three.

Which security scanner is best for an indie hacker on a budget?

For a budget-conscious indie hacker the honest shortlist is GuardLayer or Semgrep for code, Socket for dependencies, and free tiers wherever you can stack them — with your stack and repo count as the deciding factors. All pricing below was verified in June 2026; check the vendor pages before you buy, because security pricing changes often.

Snyk — the broad incumbent

Snyk covers SCA, SAST, container, and IaC scanning, and its free tier is genuinely useful: $0 with unlimited contributing developers, capped at a number of tests per month per product (around 200 open-source, 100 SAST). The paid Team plan is $25 per contributing developer per month — but Snyk's own plan page sets a minimum of 5 developers (up to 10), so the realistic entry price is $125/month even if you're a team of one. Great breadth; the seat minimum is the catch for solo use.

GitGuardian — secrets specialist

GitGuardian is the strongest name in secrets detection — API keys, tokens, and credentials committed to history. Its free tier is unusually generous: free for up to 25 developers with real-time scanning, then $18 per active developer per month above that. If a leaked key is your single biggest worry — a reasonable one; see hardcoded API keys in Next.js — the free tier alone may cover you. It does not do general SAST or SCA, so it's a complement, not a one-stop shop.

Socket — supply-chain / dependency focus

Socket specializes in supply-chain attacks: malicious packages, install scripts, typosquats — threats a CVE database misses. It's free and unlimited for open-source projects, with a Team plan at $25 per developer per month and Business at $50 per developer per month for higher quotas and reachability analysis. If dependency risk is your priority — and for anyone running npm install freely it should be; see vulnerable npm dependencies — Socket's free tier is hard to beat.

Semgrep — powerful, free up to a point

Semgrep is a strong SAST engine with an open-source core and a custom-rule language. Its hosted plan is free for up to 10 contributors and 10 private repos, which comfortably covers a solo dev — the standout deal in this list. Above that, the Team plan is $35 per contributor per month. The trade-off is effort: real value often means writing and tuning rules and managing baselines, which costs you the scarcest thing you have.

SonarQube Cloud (formerly SonarCloud) — code quality + security

Sonar leans toward code quality (bugs, maintainability, code smells) with security on top. It's free for public projects and offers a free private tier up to 50,000 lines of code; paid Team pricing starts around €30/month and scales by lines of code analyzed rather than by seat — a refreshingly different model. Strong if you want quality and security in one dashboard; lighter on framework-specific security footguns.

GuardLayer — flat per-repo, Next.js + Supabase precision

Full disclosure: this is our tool, so weigh accordingly. GuardLayer is priced per repo, not per seat: Free covers 1 repo, Solo is $19/month for 5 repos, and Studio is $49/month for unlimited repos plus team access and an audit log. For a solo dev running several side projects, that flat model is the cheapest path here — every other tool charges per developer, which quietly penalizes the one-person shop with multiple apps.

The second half of the wedge is stack precision. GuardLayer scans specifically for Next.js + Supabase footguns — disabled RLS, leaked NEXT_PUBLIC_ keys, missing input validation in API routes, tables shipped without RLS — and posts results as a PR comment plus a merge-gate Check Run before code lands. It's deliberately narrow: it won't audit your Python microservice or your container images. If your stack is Next.js + Supabase, that narrowness is the point. If it isn't, one of the broader tools above is the better fit.

So which one should you actually pick?

There's no single winner — there's a winner for your situation:

• Next.js + Supabase, several repos, zero tuning: start with GuardLayer's free tier, then Solo if you outgrow one repo.
• Broadest single platform, fine with the seat model: Snyk's free tier, knowing the paid jump has a 5-seat minimum.
• Top fear is a leaked secret: GitGuardian, likely free at your size.
• Top fear is a malicious dependency: Socket, free for open source.
• Deep, customizable SAST and time to tune: Semgrep, free up to 10 repos.
• Code quality and security in one view: Sonar, free under 50k LoC.

The smartest solo-dev move is usually a small stack of free tiers — Socket for dependencies, GitGuardian for secrets, a stack-fit SAST scanner for code — rather than one expensive all-in-one seat. None of these tools fully overlap, and the free tiers are generous enough to cover a lot of ground for $0 to $20 a month.

If your stack is Next.js + Supabase, the fastest way to see where you stand is to run a free scan — no signup gymnastics, and you'll get the same PR-comment output GuardLayer posts on every push. Worst case, you confirm you're clean. Best case, you catch a service_role leak before a bot does.

FAQ

What is the best free security scanner for a solo developer? There's no universal winner, because the tools cover different things. For dependencies, Socket is free and unlimited for open source. For secrets, GitGuardian is free up to 25 developers. For SAST, Semgrep is free up to 10 contributors and 10 private repos, and GuardLayer's free tier covers 1 repo with Next.js + Supabase rules. Most solo devs combine a couple of free tiers.

Why is per-repo pricing better than per-seat for indie hackers? Per-seat pricing assumes you're growing a team and charges for each developer — and some plans, like Snyk's Team tier, won't sell you fewer than five seats. As a solo dev running multiple side projects, that's a full minimum-five bill to scan one app. Flat per-repo pricing like GuardLayer's scales with your projects, not headcount, so several small apps cost far less.

Do I need a security scanner if my app is small? Yes — small apps leak the same way big ones do. A single NEXT_PUBLIC_ prefix on the wrong variable or one disabled RLS policy exposes real user data regardless of how many users you have. The cost of a breach is not proportional to your MRR.

Can one scanner do SAST, SCA, and secrets together? Some platforms (like Snyk) bundle all three, but coverage and quality vary by category, and bundling usually means a per-seat price. Many solo devs get better results — and a lower bill — by combining specialized free tiers: one for code, one for dependencies, one for secrets.

How long does it take to set up a scanner as a solo dev? For repo-connected tools like GuardLayer, GitGuardian, or Socket, it's minutes: authorize the repo and push. Engines like Semgrep can take longer if you want to write or tune custom rules, which is where solo devs often lose momentum.