Engineering as Marketing: Examples and How to Build Free Tools

Last updated October 2026.

Engineering as marketing is one of the most underused growth strategies in B2B. The idea is simple: build free tools that solve a real problem for your target audience, and let those tools do your customer acquisition for you.

Justin Mares and Gabriel Weinberg popularised the concept in Traction, defining it as using engineering time to create useful tools like calculators, widgets, and educational micro-sites that put your company in front of potential customers. These tools generate leads and expand your customer base.

What’s changed is who can build them. Vibe coding — using AI tools like Lovable, Bolt, Replit, and Cursor to build apps through natural language prompts — means marketers can now create these tools themselves, without waiting for engineering resources. The tooling moves fast (as of October 2026, Cursor has said it is joining SpaceX), so check each tool’s current status before you commit to it.

Why engineering as marketing works

Free tools work as a growth channel because they compound. Unlike a paid campaign that stops delivering the moment you turn off the budget, a useful tool keeps attracting and converting users for years. HubSpot’s Website Grader is still live and free to use, years after it first launched, which shows how long a useful tool keeps earning attention (as of October 2026).

The characteristics that make this strategy effective:

• Solves one specific problem. The best tools do one thing well. They answer a single question your audience is already asking.
• Low friction. No long onboarding, no complex setup. Ideally no signup required at all — the tool works immediately.
• Clear handoff to your product. The tool demonstrates the value of your paid product without requiring a hard sell.
• Compounds over time. Unlike campaigns, tools build backlinks, earn search rankings, and generate word of mouth that grows with minimal ongoing effort.

Classic examples that still hold up

The playbook is well established. Companies have been using free tools to drive acquisition for over a decade:

HubSpot Website Grader — Enter your URL, get an instant audit of your site’s SEO, performance, and mobile readiness. It generated millions of leads by delivering immediate value whilst positioning HubSpot as the solution to every problem it surfaced.

Moz Keyword Explorer — A free keyword research tool that gives enough value to hook marketers, then naturally upsells to Moz Pro for deeper analysis and tracking.

Shopify Business Name Generator — Captures entrepreneurs at the earliest possible stage of their journey. Before they’ve built a product, before they’ve chosen a platform — they’re already inside Shopify’s ecosystem.

Canva’s acquisition of Kaleido — Canva kept the background removal tool as a standalone product for years, and it drove enormous traffic on its own whilst nudging users towards Canva for further design work. As of October 2026, remove.bg has said its standalone site will close on 1 December 2026, with background removal moving into Canva, a reminder that free tools can end up folded into the paid product they feed.

Ahrefs Keyword Generator — No signup required. The free output is good enough to be useful on its own, but good enough to make you want the full platform.

Types of free marketing tools compared

Not every free tool takes the same effort or sits at the same point in the funnel. The effort and handoff columns are our judgement, so treat them as a starting point.

Use the ICE framework or RICE framework to score the options and decide which to build first. The funnel stage table later in this article shows how satellite apps replace static content at each stage.

The old problem: marketing teams couldn’t build anything

Despite its effectiveness, engineering as marketing has historically belonged to companies with spare engineering capacity. Most marketing teams lack developers. And even when they have them, free tools rarely win the prioritisation battle against product features, bug fixes, and technical debt.

The result: a strategy everyone knows works but almost nobody executes. Marketing teams default to what they can control — blog posts, paid ads, ebooks, gated PDFs — because they lack the technical resources to build tools.

How vibe coding changes everything

Vibe coding platforms like Lovable, Bolt, Replit, and Cursor have changed this completely. Describe what you want in plain English. The AI builds it.

Andrej Karpathy coined the term “vibe coding” in early 2025, and the tools have matured rapidly since. At Lovable alone, non-developers have built complete SaaS applications with full authentication, food-tracking apps, scheduling platforms, and even pitch decks.

For marketing teams, this removes the engineering bottleneck entirely. You no longer need a developer to build an ROI calculator, a benchmarking tool, or an interactive assessment. You need an afternoon and an AI coding tool.

Satellite apps: engineering as marketing across the full funnel

Elena Verna and Jonathan Yagel argue that vibe coding does more than make engineering as marketing easier — it expands where the strategy applies. They call the concept “satellite apps” — free, lightweight micro-products that work across the entire funnel, not just at the top.

Their framework positions satellite apps as replacements for static content at every stage:

The key insight: satellite apps “show” rather than “tell.” Instead of writing a whitepaper arguing that your approach saves money, you build a calculator that proves it with the prospect’s own numbers.

Satellite apps share several characteristics:

• Free to use with no monetisation requirements
• Low maintenance — built quickly, requiring minimal ongoing optimisation
• Obvious value to your target customer
• Built-in distribution through SEO, social sharing, or integration into existing demand channels
• Clear handoff into your primary product

What to build: finding the right tool

The best tools solve problems your audience already searches for. Four ways to find the right one:

Start with keyword research. Look for “how to calculate,” “free tool for,” and “[your category] calculator” searches in your niche. High search volume plus low competition equals opportunity.

Mine your sales conversations. What questions do prospects ask repeatedly? What calculations do they do manually in spreadsheets? Those spreadsheets are your satellite apps waiting to be built.

Look at your onboarding friction. What do new users struggle to understand before they sign up? Build a tool that gives them the “aha” moment before they’ve even created an account.

Audit your existing content. Which blog posts get the most traffic but the lowest conversion? Those topics might work better as interactive tools than static articles.

Getting started this week

You don’t need a full SaaS product. Start small:

1. Pick one problem your target audience searches for regularly
2. Open Lovable or Bolt and describe the tool in plain English
3. Keep the scope tight — one input, one output, one clear result
4. Add a contextual CTA that links to your main product
5. Publish it on a subdomain or dedicated page and track traffic and conversions against your North Star Metric

The barrier to entry is now almost zero. A marketer with no coding experience can build and ship a working tool in a single afternoon. The companies that move first will build a library of compounding assets whilst their competitors still debate whether to gate their next PDF.

Engineering as marketing has always been one of the highest-leverage growth channels available. The difference now: you no longer need engineers to do it.

About Growth Method

A free tool is a campaign, and the best ones start as small experiments. Build the smallest version this week, measure what it does to your goal using first-party data, then keep it, change it or drop it. That is the plan, launch, analyse, repeat loop, and it is how AI-first marketing teams are replacing long, linear plans with fast tests.

Growth Method gives B2B marketing teams AI agents that run their campaigns: plan, launch and analyse, from live data, against one goal. Agents draft and prioritise campaign ideas, such as which free tool to build next, record the before-metrics at launch and analyse the result, working alongside your team. If you want the skills behind the tooling, our growth marketing course covers the wider loop.

Get started with Growth Method and plan your first campaign.

Frequently asked questions

What is engineering as marketing?

Engineering as marketing is a growth strategy that uses engineering effort to build free tools, calculators, graders and micro-sites that solve a real problem for your target audience. The tool attracts visitors through search and word of mouth, then hands them over to your paid product.

Can marketers do engineering as marketing without developers?

Yes. Vibe coding tools such as Lovable, Bolt, Replit and Cursor let you describe a tool in plain English and have AI build it, so a marketer can ship a simple calculator or generator in an afternoon. Complex tools that need proprietary data or heavy integrations may still need engineering help.

What free tool should I build first?

Start with the smallest tool that answers a question your audience already searches for, with one input and one clear output. Calculators and generators are the quickest to build, and a prioritisation framework such as ICE or RICE helps you choose between ideas.

How do you measure whether a free tool is working?

Track visitors, completed uses of the tool and the number of people who click through to your product, and tie them to a single goal such as signups or demos booked. Record a baseline before launch and use first-party data rather than vanity metrics.

How is engineering as marketing different from lead magnets?

A lead magnet is usually static content, such as a gated PDF, that you trade for an email address. A free tool delivers value immediately, often with no signup, so it shows rather than tells. It also earns backlinks and search rankings over time, which a gated PDF rarely does.