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Launch ready, Scan passed, Bugs fixed

Ship AI‑built apps without invisible bugs.

Scan, fix and monitor your site in one workspace.

Create your workspace Try a website scan

The first scan needs no account and reads only your public site.

Preview of a Defexity scan running over a project in a code editor: 142 files scanned and 7 issues found, including a hard-coded Stripe secret key and an SQL injection marked critical, a missing auth check marked high, and open CORS marked medium.

Works with the tools you already build with.

  • GitHub
  • Vercel
  • Netlify
  • Railway
  • Supabase
  • Stripe
  • OpenAI
  • Anthropic
  • Cursor
  • Lovable
  • Bolt
  • Replit

Product names and logos belong to their owners and are shown to indicate compatibility, not endorsement.

The gap

AI can build your app. Defexity makes sure it survives production.

  1. AI-built apps often look finished but fail in production

    The demo works on localhost. Then real users hit missing error pages, exposed keys, broken emails and a checkout that never confirms.

    Secrets, headers, legal pages

  2. One small AI change can break signup, checkout, or payments

    Ask for a new feature and the agent quietly rewrites a webhook or an auth check. Nothing tells you until revenue drops.

    Regressions ship silently

  3. Security issues and broken flows are hard to spot before users do

    Open API routes, leaked service keys and soft 404s are invisible in the UI. You find out from a customer, or an attacker.

    Invisible until it is not

Before and after: an API route that returned every user without checking the session is fixed to require a session, scope the query to the user's organization and return only needed fields. The rescan passes.

AI fix prompts

Don’t just find the bug. Fix it.

Defexity turns evidence into a precise prompt for the AI tool you already use, then reruns the check and only marks it resolved when it passes.

  1. Deploy a3f9c1 pushed

    “Add annual billing toggle” · 2 files changed

  2. Checkout failed after deployment

    Critical flow · step 4 of 5 · 4.6s

  3. Stripe webhook returned 500

    POST /api/webhooks/stripe · signature verification removed

  4. Defexity generated a repair prompt

    Likely cause: webhook signature validation missing since a3f9c1

  5. Rerun passed, incident resolved

    Checkout green again · 3 min after the fix

Fix this production issue in this codebase. Find the relevant files yourself before editing.

Issue FLOW-CHECKOUT: Checkout failed after deployment: Stripe webhook returned 500
Site: https://my-saas.vercel.app/
What Defexity found:
- Failing step: POST /api/webhooks/stripe → 500 after checkout.session.completed
- Changed in deploy a3f9c1: app/api/webhooks/stripe/route.ts

First confirm the issue in the code or live config. If it is not present, say so and change nothing.
Task: In app/api/webhooks/stripe/route.ts, read the raw body with await request.text(), verify it with stripe.webhooks.constructEvent using the stripe-signature header and STRIPE_WEBHOOK_SECRET, return 400 on a bad signature, and keep the existing fulfilment logic unchanged.

Constraints: make the smallest change that fixes this, keep the current design and behaviour, never paste secret values into code or chat, and tell me which files you changed.
Done when: Send a test event with the Stripe CLI and confirm a 200, then complete a test-mode checkout end to end.

Security

Security checks built for AI-generated code

Rules follow the OWASP Cheat Sheet Series and WCAG 2.2, and every finding comes with evidence and a fix you can paste.

Read-only by design

Scanning your site should never be a risk to it. These rules hold for every check, on every plan.

  • Reads only what a visitor can see: GET and HEAD requests, robots.txt respected
  • Private, local and cloud-metadata addresses are refused before any request
  • Secrets, tokens and passwords are redacted before evidence is stored
  • GitHub access is read-only and limited to the repositories you pick

  • Secrets and credentials

    Payment, AI and cloud keys in bundles; exposed .env and .git; database URLs.

  • Authentication and access control

    API routes that answer without a session; weak session cookies.

  • Injection and input validation

    CSP, mixed content and stack traces that make injection worse.

  • Configuration hardening

    HTTPS, HSTS, clickjacking, referrer and permissions policies.

  • Dependency vulnerabilities

    OSV.dev advisories for your lockfile once GitHub is connected.

  • AI security

    Browser-side AI keys, unauthenticated AI routes and missing rate limits.

  • Payment and webhook security

    Webhook signature checks and test-mode checkout monitoring.

  • Privacy and DPDP readiness

    Policies, consent before tracking, pre-ticked boxes and DPDP signals.

Defexity identifies potential risks. It does not provide legal advice or guarantee compliance. Browse every rule

How it works

One project, from first idea to verified fixes

my-saasproduction

  • WebsiteScanned 4 min ago
  • APIAll checks passing
  • Help chatbotLive on site
  • DatabaseBackups verified
  • Checkout flowPassed 2 min ago

  1. Step 01

    PlanBeta

    Lay out pages, services and milestones on a visual board, then turn them into tasks with due dates and a Today list.

  2. Step 02

    Connect

    Add your live site, link a GitHub repository with read-only access and keep preview environments next to production.

  3. Step 03

    Scan and understand

    Security, reliability, privacy, accessibility, SEO and performance findings, each with evidence, severity and the reason it matters.

  4. Step 04

    Fix and verify

    Copy a repair prompt into Cursor, Claude Code, Lovable, Bolt or Replit. A finding is marked fixed only when a re-check passes.

  5. Step 05

    Monitor

    Uptime, API and browser journeys on a schedule and after each deploy, with incidents and summaries drawn from the run evidence.

  6. Step 06

    Support visitors

    Build a chatbot that answers only from pages you approve, cites its sources and hands off when it does not know.

Try a website scan

Paste a public URL. No account, no code access: Defexity reads what any visitor could see.

No sign-up for the first scan. Only scan sites you own or are allowed to test.

Who it is for

Built for indie hackers, freelancers, and AI-first teams

  • Indie hackers

    You shipped with Lovable or Bolt over a weekend. Defexity checks the things the demo never exercised before you post the launch.

  • Freelancers and agencies

    Hand clients a site with a readiness report, then keep watching it after handover so a plugin update never becomes your emergency.

  • AI-first teams

    Your engineers merge AI-written changes daily. Deployment checks catch the regression in the PR, with the fix prompt attached.

Early users

We are onboarding our first builders now.

No invented logos or reviews here. Run a free scan, tell us what it caught, and help shape what we build next. Real customer stories will appear here with permission.

Run your first scan

Pricing

Simple pricing that scales with your apps

Start free. Upgrade when you want Defexity watching your app around the clock.

  • Free

    Find out what is broken before your users do.

    $0forever

    Scan your app free

    No credit card required

    • 2 scans per URL per day
    • 2 code scans per day
    • Security issue detection
    • Dependency vulnerability scanning
    • Copy-paste fix prompts
    • 1 app
    • 1 seat
    • 7 days history

  • Indie

    Keep one live app healthy after every change.

    $12.50per month, $150 billed yearly

    Start with Indie

    Renews every year until you cancel · 14-day refund

    • 8 scans per URL per day
    • 8 code scans per day
    • Security issue detection
    • Dependency vulnerability scanning
    • 5 custom rules
    • Copy-paste fix prompts
    • AI assistant, 60 answers a day
    • Uptime and API monitoring
    • 3 monitored flows
    • Daily deployment checks
    • Chatbot tests
    • Email alerts
    • 1 app
    • 1 seat
    • AI planning boards
    • Public status pages
    • Cron job heartbeats
    • Domain, SSL and email alerts
    • 30 days history
  • Most popular

    Pro

    Catch regressions on every deploy, with fixes ready.

    $32.50per month, $390 billed yearly

    Start with Pro

    Renews every year until you cancel · 14-day refund

    • 20 scans per URL per day
    • 20 code scans per day
    • Security issue detection
    • Dependency vulnerability scanning
    • 25 custom rules
    • Copy-paste fix prompts
    • AI assistant, 150 answers a day
    • Uptime and API monitoring
    • 8 monitored flows
    • Checks on every deploy
    • Chatbot tests
    • GitHub PR checks
    • Email, Slack, Discord alerts
    • 3 apps
    • 3 team seats
    • AI planning boards
    • Public status pages
    • Cron job heartbeats
    • Domain, SSL and email alerts
    • Checkout script watch
    • 90 days history

  • Agency

    Reliability for every client app you ship.

    $82.50per month, $990 billed yearly

    Start with Agency

    Renews every year until you cancel · 14-day refund

    • 40 scans per URL per day
    • 40 code scans per day
    • Security issue detection
    • Dependency vulnerability scanning
    • 100 custom rules
    • Copy-paste fix prompts
    • AI assistant, 800 answers a day
    • Uptime and API monitoring
    • 20 monitored flows
    • Checks on every deploy
    • Chatbot tests
    • GitHub PR checks
    • Email, Slack, Discord alerts
    • 10 apps
    • 10 team seats
    • Client reports
    • AI planning boards
    • Public status pages
    • Cron job heartbeats
    • Domain, SSL and email alerts
    • Checkout script watch
    • 180 days history

AI Assistant add-on · +$9/month

1 website assistant · 5,000 messages per month · 500 knowledge pages or files · Daily reliability checks

Available on any paid plan · Renews monthly until you cancel

Paying safely: checkout is run by Paddle, a PCI DSS Level 1 merchant of record. Your card is entered on Paddle’s secure checkout and never reaches Defexity. Apple Pay and Google Pay work too, receipts come from Paddle, and first payments have a 14-day full refund. More

Compare every feature

Bring your next project into one workspace.

Plan it, scan it, monitor what matters and fix issues before visitors find them.

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No credit card required. The first scan needs no account.