Idea to App: Using Lovable to Create a GTM Funnel Calculator

Written By Ben Cotton

Like many people I want to learn more about artificial intelligence (AI). This post is part of a series where I experiment with AI tools, share what I build and learn. My hope is that these posts will create discussion around this transformational technology, its use cases and maybe even help others on their journey of AI discovery. 

The focus of this experiment was to use AI tools to create a GTM Funnel Calculator - an app that shows how many leads a Marketing team needs to generate, so a Sales team can hit its number. I used Lovable to create the app, and it can be seen below (you can also view it on Lovable).

The Brief

I built a dynamic marketing and sales funnel calculator using Lovable, an AI-powered no-code app builder. My goal was to help GTM teams model their funnel stages, simulate conversion rates, and forecast revenue outcomes in real time. The entire build took just a few hours from concept to launch.

I began by mapping the core funnel stages: Website Visitors, MQLs, SALs, Opportunities, and Closed Won Deals. I then wrote a natural-language prompt in Lovable describing the functionality: editable inputs, stage-by-stage conversion logic, real-time calculations, and a visual funnel representation. Lovable’s AI instantly generated the structure, layout, and logic for the tool - no coding required.

From there, I refined the UX: replacing static text with input fields, layering in dynamic formulas (e.g. SALs = MQLs × conversion rate), and adding a revenue projection module based on average deal size. I then asked Lovable to create a horizontal funnel visualization that updated in real time, allowing users to see exactly where leads drop off and how small changes impact downstream revenue.

Once the calculator logic and visuals were working, I deployed it using Lovable’s built-in hosting and shared it publicly. The result is a lightweight, customisable app that teams can use to stress-test their funnel strategy.

Lovable made the entire process fast, intuitive, and flexible - it’s the perfect platform for turning ideas into real, working GTM tools.

Ben Cotton

I'm a Senior Marketing Manager at HubSpot based out of Dublin, Ireland. Working at the intersection of marketing and sales I use content, data and technology to enable our rapidly growing sales team to crush its goals. It's challenging, rewarding and lots of fun.

As an experienced data-driven marketer I help SaaS businesses increase website traffic, generate leads and drive sales. I bring a proven track record of devising and leading successful marketing programs that create predictable recurring revenue. I also have an entrepreneurial spirit and love developing teams, creating growth and getting stuff done.

Throughout my career I've been privileged to work with a number of industry leading and well-loved brands including HubSpot, Indeed, Edelman, HP, Microsoft and PUMA. From these experiences I have developed a passion for using inbound marketing and selling to help organisations grow.

I hold Google Analytics and HubSpot Inbound qualifications, and am passionate about continuous learning with a deep interest in marketing, entrepreneurship, startups, business, SaaS, sales and technology.

If you'd like to know more or discuss how we can work together, please get in touch over on Twitter: @BenCotton, by email: contact@ben-cotton.com or sending an InMail. I'm always keen to connect with and learn from smart people.

http://www.ben-cotton.com/
Previous

Brewed Differently: Crafting a Distinctive Berlin Brewery Brand
Next

From Zero to Zinger: Using AI to Build a Street Smart Chicken Wing Brand