From bottleneck to growth engine: How CLEAN transforms your HubSpot site

Campaigns move fast. Most websites don’t. That’s the gap we set out to close, and why we build every HubSpot site on the CLEAN theme: a modular design framework built to move at the speed of marketing.

Picture this: your campaign is ready. Creative is approved. Ads are scheduled. But the landing page, the critical piece of your funnel, is still “in development.” Days turn into weeks. By the time it’s live, the momentum is gone. This is one of the most common pain points we see in marketing teams. The campaign moves, but the site lags.

How CLEAN changes the pace

CLEAN isn’t just a HubSpot theme. It’s a modular design system built around agility.

Think of it as a marketing toolkit inside your HubSpot CMS:

• Need a new landing page? Clone an existing page and swap in new modules
• Want to test a new CTA or headline? Run an A/B test with clean module duplication
• Refreshing for a seasonal campaign? Update the global styles, colours, fonts, and spacing everywhere

Erika, our Head of Design at XEN Create, says it best:

“Marketers shouldn’t have to wait weeks to launch a campaign. CLEAN gives us the speed we need, without sacrificing consistency, performance, or brand.”

What CLEAN unlocks for Marketing Teams

• Faster Launches: Campaign landing pages go live in days, not weeks. No bottlenecks. No dev queue.
• Streamlined Testing: Duplicate, adjust, and test modules with minimal effort. Experimentation becomes part of your everyday process.
• Long-Term Scalability: As your brand grows, your site evolves with it. No need for costly rebuilds every year.
• Consistent User Experience: CLEAN ensures that no matter how often you update, the design stays cohesive and on-brand.

CLEAN and CRO: Turning consistency into conversions

CLEAN isn’t just about building pages faster, it’s about building smarter. Every aspect of the system is designed to support ongoing optimisation. For marketing teams focused on performance, that means a website that’s not only easy to update, but engineered to convert.

1. Consistency that builds trust

Conversion begins with trust. CLEAN provides uniform layouts, standardised typography, and predictable CTA placement, reducing friction for users navigating your site.

When visitors see familiar patterns across pages, they feel more confident taking action. No confusion. No guesswork. Just smooth, clear decision-making.

A/B tests across multiple client sites consistently show that standardised CTA modules outperform ad-hoc button placements, with some clients seeing 8–12% increases in click-throughs.

2. Speed that enables continuous testing

Traditionally, testing is slow, expensive, and often skipped. With CLEAN, launching a test doesn’t mean building from scratch; it means duplicating a section, tweaking a headline, or switching a layout. No dev delays. No broken designs.

You can experiment with:

• Different hero layouts (image vs video)
• CTA copy variations (“Book Now” vs “Get My Quote”)
• Testimonial placement
• Form field reduction… all in hours, not days.

This speed makes it possible to run iterative tests, where small improvements compound into significant conversion lifts over time.

3. Design built for data feedback loops

CLEAN isn’t a “set-and-forget” system. Because it’s modular, every element can be tracked and evaluated. You can identify high-performing modules and repurpose them across other pages, or retire layouts that don’t perform.

Using HubSpot’s built-in reporting tools, marketers can track:

• Which layouts lead to the most form fills
• What CTA styles drive clicks
• Where users drop off in the journey

CRO built into the foundation

Instead of reacting to underperformance with expensive redesigns, CLEAN puts CRO at the core of your site. It gives your marketing team:

• The tools to move quickly
• The freedom to test confidently
• The structure to improve continuously

In short, it turns your HubSpot site into a testing ground for growth, not a static brochure that needs rescuing every 18 months.

Sources

1. HubSpot Themes Overview – Developers Guide
   How HubSpot themes (including CLEAN) use modular building blocks, global styles, and flexible templates to accelerate builds and keep design consistent.
   https://developers.hubspot.com/docs/cms/building-blocks/themes/themes-overview
2. A/B Testing Landing Pages – HubSpot Knowledge Base
   Official guide on running A/B tests in HubSpot CMS, with emphasis on faster deployment using modular layouts.
   https://knowledge.hubspot.com/website-pages/run-an-a-b-test-on-a-landing-page
3. Creating Reusable Content with Modules – HubSpot Academy
   Explains how reusable modules improve UX, reduce friction, and maintain brand consistency.
   https://academy.hubspot.com/lessons/creating-reusable-content-with-modules
4. Page Performance Reporting – HubSpot Help
   How to analyse website page performance, form fills, CTA clicks, and visitor behaviour to guide CRO improvements.
   https://knowledge.hubspot.com/reports/analyze-website-page-performance
5. Improving Site Speed – HubSpot Developer Guide
   Best practices for optimising HubSpot CMS site speed, with built-in CDN and performance-focused theme structures.
   https://developers.hubspot.com/docs/cms/performance/site-speed