Block VI · Coding with agents · Lesson 28

Vibe coding: build an app without knowing how to code

You'll see how to go from an idea to a working prototype with Lovable, Bolt, v0 and Replit, and what to check before taking it to production to avoid security and cost scares.

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What you'll see in this lesson

  1. Vibe coding: describe the app and AI builds it

    You explain what you want in your own words, the tool writes all the code, and you test it and ask for changes.

  2. Lovable, Bolt, v0 and Replit: what each one does best

    All four turn a description into a working app, but each has its own strength.

  3. From idea to prototype in one afternoon

    Start with a short, clear brief, build the bare minimum and improve it with small changes, one after another.

  4. What they cost: entry plans in October 2026

    Paid plans start between 20 and 30 dollars a month; free ones are for trying things out, not for finishing a project.

  5. Credits, tokens and effort: where the money goes

    Each platform measures in its own way, but on all of them messages that trigger a lot of work cost more.

  6. The big scare: exposed keys and open data

    Anything that runs in the browser can be read by anyone: keys and data access rules belong on the server.

  7. Checklist before going to production

    Five areas to check one by one: keys, authentication, database, costs and backups.

  8. When to make the jump to a coding agent

    As the project grows, so do the bill and the fragility: it's time to move the code to your own repository.

  9. Summary: from prototype to production without scares

    Vibe coding to get there fast; security and cost discipline before opening it to the public.

Tools and concepts

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