published feb 8, 2026
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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.
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.
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.
Go to Replit.com and toggle on Plan mode.
Paste in a prompt like this:
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.
Try building a custom form with your new tool. The example form looked like this:
Make sure your app generates a code snippet called an iframe.
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.
Try filling out the form. The example had an email field at the bottom.
To find your lead data, go back into Replit, then open Database > Production Database.
Keep going
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