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Your vibe-coded app broke. Paste the error. Get the fix.

Plain-English answers for the errors that apps built with Cursor, Claude Code, Codex, Lovable, Bolt, Replit and v0 run into. Each one comes with a fix prompt you paste straight back into your AI tool. Plus 28 starter prompts for the next build.

Or try one:

Checked against the fix library inside your browser. Your error never leaves this page.

    New here? Pick where to start.

    My app is showing an errorPaste it in and get the cause and a fix prompt.Fix an error → I'm starting something new28 starter prompts for apps, agents, games and launch checks.Browse prompts → I'm not technicalSee how it works in three steps. No coding knowledge needed.How it works →

    Three steps. About a minute.

    You don't need to understand the error. You only need to copy it.

    1. Paste the errorCopy the red text from your app or tool and drop it in the box. The matcher checks it in your browser.
    2. Read the causeOne plain-English paragraph on what went wrong and why. No jargon wall.
    3. Copy the fix promptIt tells your AI tool exactly what to change and what not to break.

    Most common breakages

    Six of the 55 fixes in the library.

    See all 55 fixes →
    DeployEnv varsVercel

    Works locally, broken after deploy: env var missing in production

    .env files stay on your machine. Your host only knows the variables you add in its dashboard.

    SupabaseDatabaseAuth

    Supabase: new row violates row-level security policy

    Row Level Security is on for that table, but no policy allows this user to insert (or update) this row.

    CORSAPI

    Blocked by CORS policy: No 'Access-Control-Allow-Origin' header

    The browser refused to give your page the response because the API didn't say your site is allowed to read it.

    Next.jsReact

    Hydration failed: server HTML didn't match the client

    The first render on the server and the first render in the browser produced different HTML.

    SecurityEnv varsAPI keys

    My API secret is in the browser bundle

    Anything in client-side code, including NEXT_PUBLIC_ and VITE_ variables, is downloadable by anyone. Treat that key as compromised.

    WorkflowAI tools

    The AI keeps 'fixing' the same bug and making it worse

    Each blind retry adds more code and more guesses. Stop patching and get a diagnosis first.

    Starter prompts

    Copy one into your AI tool to start a build the right way.

    See all 28 prompts →

    Paid kit · $19

    The Vibe Coder's Fix & Launch Kit

    A debug method, 24 prompts, Supabase security templates, and launch checklists. PDF + Markdown, single-user license.

    Buy the kit, $19

    Get the free Pre-Launch Security Checklist (PDF)