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How To Build a Lead Magnet Tool for Your Website With Replit

This guide shows you how to use Replit to build a custom calculator lead form for your website.

intermediate 3 steps

Introduction

This guide shows you how to use Replit to build a custom calculator lead form for your website. You will produce a simple internal lead-generation calculator builder that captures email leads, stores responses, and can generate embeddable calculators. If you can copy and paste, you can follow the workflow.

Keep it simple: this is an app only you and your team will use, not a billion-dollar SaaS app. Also, publish your app before embedding it so your forms do not disappear when you leave Replit.

Step-by-step 3 steps

Instructions

  1. Step 1 of 3

    Create the lead calculator app in Replit

    Go to Replit.com and toggle on Plan mode.

    replit_plan_mode

    Paste in a prompt like this:

    Prompt 
    Build a "CalcFactory" app using Python (Flask) and Replit SQL. It is a LeadGen Calculator Builder where users create embeddable cost-savings calculators that capture email leads and track analytics. Make it so the user can create new calculators with custom color scheme, text fields and calculator formulas editable. Store the lead's response and email in a Replit database.

    Answer any relevant questions the agent has, then hit “Build.”

    💡 Pro tip: Keep it simple. This is an app only you and your team will use. You are not turning this into a billion-dollar SaaS app.
  2. Step 2 of 3

    Build and embed a custom calculator

    Try building a custom form with your new tool. The example form looked like this:

    custom_calc_1

    Make sure your app generates a code snippet called an iframe.

    calc_embed

    Copy that iframe and embed it into your website. If that feels too technical, you can hand the iframe code to Replit, Codex, or another AI tool and it will know what to do.

    💡 Pro tip: Deploy your lead form app with the “Publish” button in the top right. If you embed forms from your Preview build, they will disappear when you leave Replit.
  3. Step 3 of 3

    Test the form and find your lead data

    Try filling out the form. The example had an email field at the bottom.

    calc_closeup

    To find your lead data, go back into Replit, then open Database > Production Database.

    replit_database

You're done

That's the whole workflow

Mark it complete to save your progress. Background and answers to common questions follow below.

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Overview Back to the steps

Background and context

Who This Is Useful For

  • Agencies that want to build custom lead magnets for clients without hiring a dev team.
  • Marketing teams tired of paying per-seat pricing for simple calculator tools.
  • Non-technical founders who want to capture leads with interactive tools.

What You Will Build

You will build a reusable calculator lead form app for your website. The app lets you create custom calculators, generate an iframe embed, and store lead responses and emails in a Replit database.

  • A custom calculator lead form.
  • Editable calculator colors, text fields, and formulas.
  • An iframe code snippet you can embed on your website.
  • A place in Replit to view captured lead data.
leadcalcbuilt

What You Need

  • Replit Core membership ($25/month).
  • A website where you want to embed the calculator.
  • Calculator details such as the color scheme, text fields, and formulas you want to use.

Going Further

  • Embed the generated iframe into your website.
  • Send lead data somewhere else by using an automation tool like n8n or Make.com to receive the data via webhook and store it in a Google Sheet.
  • Build automations to deliver lead magnets to the user.