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Quality control for vibe coded projects

You vibe coded it. Now make sure it ships.

Paste a URL and Greenlint opens your pages in a real browser, checks speed and accessibility, and hands back what is broken, worst first. Every finding comes with a prompt you paste into your AI coding tool to fix it.

Must be live and public. A preview link works too.

  • No setup
  • 3 pages free
  • Results in about 2 min

Working with

  • Cloudflare
  • Next.js
  • Claude
  • Clerk
  • Neon
  • Drizzle
  • Lighthouse
  • Resend
  • Polar
  • GitHub

See it work

A real inspection of our demo app, from scan to fix.

We ran Greenlint on our own demo app: 3 pages opened in a real browser, 11 findings back, and the prompt that fixes the worst one. This is what you get.

  1. 01 · InspectWe open every page in a real browser
    • /demo/11 findings8 performance3 accessibility
    • /demo/pricing11 findings8 performance3 accessibility
    • /demo/signup11 findings8 performance3 accessibility
    • Performance, measured the way Lighthouse does
    • Accessibility, checked against the axe rules
  2. 02 · ReportYou get one report, worst first

    Not ready to launch

    6 high-severity issues to fix first.

    Performance
    60
    Accessibility
    72
    • critical severityButtons do not have an accessible name
    • critical severityImage elements do not have `[alt]` attributes
    • high severityFirst Contentful Paint
  3. 03 · FixPaste the fix into your AI tool
    prompt.mdbutton-name
    Fix "Buttons do not have an accessible name" (Lighthouse audit `button-name`) in my app.

Problem: When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Affected pages:
- https://greenlint.app/demo/
- https://greenlint.app/demo/pricing
- https://greenlint.app/demo/signup

…

    Paste it, run the check again, and compare the scores.

What we check

One run. Four kinds of broken.

Every run covers the live checks below. Each finding tells you which page and element it is on, why it matters, and how to fix it.

  • 01Live

    Performance

    How fast your pages load and respond: Core Web Vitals, page weight, and anything that blocks rendering.

    • Largest Contentful Paint
    • Image weight
    • JavaScript cost

  • 02Live

    Accessibility

    Whether everyone can use your app: colour contrast, labels and names, keyboard and screen-reader flow.

    • Colour contrast
    • Accessible names
    • Form labels

  • 03Coming soon

    SEO

    Whether search engines and link previews understand your pages: metadata, headings, indexing, sharing.

    • Meta description
    • Heading order
    • Open Graph

  • 04Coming soon

    Security

    The basics attackers look for first: response headers, HTTPS, and exposed paths.

    • Security headers
    • HTTPS setup
    • Cookie flags

Checks marked “coming soon” are not in the product yet. Today every run covers performance and accessibility.

How it works

The launch checklist your editor forgot.

AI tools write code fast, but they rarely check how the result loads or whether everyone can use it. Greenlint does that part in three steps.

  1. 01

    Paste your URL

    Enter the address of the app you are about to ship. Greenlint opens it in a real browser, the way a visitor would.

  2. 02

    Read the report

    One report, sorted worst first. Every finding names the page and the element behind it, and explains why it matters.

  3. 03

    Paste the fix back

    Each finding comes with a ready-made prompt for your AI coding tool. Apply it, run the check again, and watch the scores move.

Pricing

Ship with a little less suspense.

Start free, no card needed. Upgrade when you need more pages, more projects, or your full history.

Free

$0

forever

  • 1 project
  • 3 pages per inspection
  • 1 inspection a day
  • Full findings and fix prompts
Start for free

Pro

$19

per month

  • 5 projects
  • 25 pages per inspection
  • 5 inspections a day
  • Full run history and PDF export
  • Your runs go first in the queue
Get Pro

Paying from Indonesia?

FAQ

No launch-day surprises.

  • What does Greenlint check?

    Two things today: how fast your pages load (performance) and whether everyone can use them (accessibility). Greenlint opens each page in a real Chrome browser, measures speed the same way Google's Lighthouse does, and checks accessibility with the axe rules. SEO and security checks are coming next.

  • Do I need to be a developer?

    No. Every finding says in plain words what is wrong, where it is, and why it matters. The fix prompt is made to be pasted into the AI tool you already build with.

  • What is a fix prompt?

    A ready-made instruction for your AI coding tool. It names the problem, the pages it shows up on, and what to change. Paste it, let your tool make the change, then run Greenlint again to see the result.

  • Can I check a site that is not live yet?

    Yes, as long as it has a public web address. A preview link from your hosting provider works. Localhost does not, because our browser cannot reach your computer. Pages behind a login or a password-protected preview are not checked either, because our browser does not sign in.

  • How long does a check take?

    About two minutes for three pages. More pages take longer, because each one is opened in a real browser.

  • Can I cancel Pro at any time?

    Yes. Cancel from Billing in your dashboard. Pro keeps working until the end of the month you paid for, then your account moves back to the free plan. The refund policy has the details.

  • What happens to my data?

    Your reports are only visible to your team. We do not sell your data or use it to train AI models. The details are in the privacy policy.

Contact

Something went wrong? Tell us.

Pick what it is about and describe what happened. Sending opens your email app with the message ready to go to support@greenlint.app. We reply within 7 business days.

Your turn

Before you ship, run Greenlint.

Paste your URL and get an honest read on what you built, in about two minutes.

Must be live and public. A preview link works too.

Free · 3 pages · about 2 minutes