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How to check your app's security: free methods vs Veilguard

Updated 2026-08-07 · 8 min read

The short answer

There is no single 'best' way to check your app, the right choice depends on your risk and budget. Free DIY checks and generic tools catch some real problems for $0 but miss the ones specific to AI-built stacks and never tell you exactly how to fix them. Hiring a penetration tester is the gold standard but costs thousands and takes weeks. Veilguard sits in the middle: it scans an AI-built app in about 60 seconds, grades it A–F in plain English, and hands you the exact fix, but it is not a substitute for a professional audit on a genuinely high-risk product.

The four realistic options

If you built an app with an AI tool and you're wondering whether it's safe, you have four honest choices. None of them is a scam and none of them is magic. This page lays out what each one actually does, what it misses, how much skill and time it takes, and what it costs, so you can pick based on your situation, not on hype.

A quick rule of thumb: the more people trust your app with money or personal data, the more of these you should stack together. Free checks and Veilguard are not mutually exclusive with a professional audit, they are the sensible first steps before one.

Option 1, Manual DIY checks (view-source, network tab, reading your policies)

You can learn a surprising amount for free just by poking at your own app the way an attacker would. Open your site, hit F12 to open your browser's developer tools, and watch the Network tab while you use the app. Look at what data comes back, and whether you can see other people's records. Use 'View Source' and search the page for anything that looks like a secret key. Open your Supabase or Firebase dashboard and actually read your Row Level Security (RLS) policies and rules.

What it catches: obvious leaks, secret keys shipped to the browser, an API that returns every user's data, a database table left fully public, a page you can reach without logging in.
What it misses: anything you don't already know to look for. Unsigned payment webhooks, subtle policy gaps, injection flaws, and misconfigured storage buckets rarely show up unless you know the exact pattern.
Effort / skill: low cost, but medium-to-high skill. You have to know what "bad" looks like, and most non-technical founders don't, which is exactly the trap.
Cost: $0.

Honest take: this is genuinely worth doing and it's free. But 'I looked and nothing seemed wrong' is not the same as 'it's secure', you can only catch the holes you already understand.

Option 2, Free and generic tools (Supabase linter, header/SSL scanners, open-source scanners)

There are good free tools, and you should use them. Supabase ships a built-in database linter that flags tables without RLS enabled. Free online scanners will grade your HTTPS setup and security headers. Open-source scanners can crawl your site for common web vulnerabilities. Each of these is real and useful within its lane.

What they catch: the specific thing each was built for, Supabase's linter flags RLS-off tables; SSL/header checkers grade your transport and headers; general web scanners find common, well-known vulnerability patterns.
What they miss: the cross-cutting, stack-specific mistakes AI tools make. A linter tells you RLS is off, but not that your policy lets any logged-in user read every row. Header scanners know nothing about your database or payment flow.
Effort / skill: low-to-medium. Running them is easy; stitching a dozen tools together and interpreting a wall of technical output is the hard part.
Cost: $0, sometimes with paid upgrades.

Honest take: free tools are excellent and you lose nothing by running them. Their limit isn't accuracy, it's that each one sees a sliver of the picture and speaks in jargon, so you're left assembling the puzzle yourself.

Option 3, Hiring a penetration tester

A professional penetration test is a human security expert manually attacking your app, thinking creatively, and chaining small weaknesses into real exploits. This is the most thorough option that exists, full stop. If you handle sensitive data, take significant payments, or have compliance obligations, a real audit is the right call and nothing on this page replaces it.

What it catches: nearly everything the other options do, plus business-logic flaws and creative attack chains that no automated tool reliably finds.
What it misses: it's a snapshot in time. The report reflects your app on the day of the test; your next AI-assisted deploy can reintroduce a hole the next morning.
Effort / skill: low effort for you, but you must find a reputable tester and be ready to act on a technical report.
Cost: typically thousands of dollars and days-to-weeks of turnaround. [SOURCE NEEDED] for any specific price figures.

Honest take: this is the gold standard and we won't pretend otherwise. The catch is cost, speed, and that it's a one-time photo, not a continuous safety net.

Option 4, Veilguard

Veilguard is a security scanner built specifically for apps made with AI coding tools (Lovable, Bolt, Cursor, Replit, v0) on stacks like Next.js with Supabase or Firebase and Stripe. You give it a URL and in about 60 seconds you get an A–F grade, every issue explained in plain English, and, this is the point, the exact copy-paste fix or a ready-made prompt for your AI tool. The paid tier adds connected repo and folder-upload scans, unlocks every fix, and keeps re-scanning on each deploy with email alerts when a new hole appears.

What it catches: the insecure defaults AI tools ship, public database rows, keys in the browser bundle, auth checks that run only in the browser, unsigned payment webhooks, public storage buckets, tuned to the exact mistakes these stacks make.
What it misses: deep business-logic flaws and creative human attack chains. It is not a manual penetration test and does not claim to be.
Effort / skill: very low. It's built for non-engineers, plain-English findings and fixes you can paste in, no security background required.
Cost: free URL scan with the full grade and every issue explained, no signup; Guard is $19/month for connected scans, all fixes, and continuous monitoring.

Honest take: our edge is plain English, the exact fix (not just a scary list), AI-stack specificity, and monitoring that keeps watching after you ship. Our limit is that we are not a replacement for a professional audit on a high-risk product, if that's you, use Veilguard to clean up first, then get audited.

So which should you pick?

Stack them, don't rank them. Almost everyone should start by running the free DIY checks and free tools, they cost nothing. If you're an AI-app builder who wants a clear grade, plain-English explanations, and the actual fixes without a security background, that's exactly what Veilguard is for, and the URL scan is free to try. If your app holds genuinely sensitive data or moves serious money, budget for a professional penetration test, and use the cheaper options to fix the easy stuff first so you're not paying an expert to find things a scanner would have caught.

Key takeaways

There is no single best method, match the effort to how much your app is trusted with money and personal data.
Free DIY checks and generic tools are genuinely worth doing and cost $0, but they only catch what you already know to look for and speak in jargon.
A professional penetration test is the gold standard, but it costs thousands, takes time, and only reflects your app on the day of the test.
Veilguard's edge is plain English, the exact fix, AI-stack specificity, and continuous monitoring, with a free URL scan to start.
Veilguard is not a replacement for a professional audit on a high-risk product. If that's you, fix the easy issues first, then get audited.

Frequently asked

Is a free security check good enough before I launch?

For a low-risk app it's a reasonable start, especially if you run the free DIY checks and free tools together. But free methods miss the stack-specific holes AI tools leave behind, so treat 'nothing obvious found' as a first pass, not a clean bill of health.

Does Veilguard replace hiring a penetration tester?

No, and we say so plainly. Veilguard finds and fixes the common insecure defaults in AI-built apps fast and in plain English. A professional pentester finds deeper business-logic and creative attack chains. On a high-risk product you want both, Veilguard first to clean up, then an audit.

Can I just use the Supabase linter instead?

Use it, it's a good tool. It flags tables without Row Level Security enabled, but it won't tell you that an enabled policy still lets any logged-in user read everyone's rows, and it knows nothing about your payment flow or browser bundle. It sees one slice; Veilguard is built to see the whole picture and explain it.