When I first started building websites here in Manhattan, Kansas, I didn’t care much about whether a builder used classes or inline styles. But after years of troubleshooting slow sites and CSS chaos, I realized this stuff matters. Big time.
I recently analyzed 12+ of the most popular WordPress builders — looking under the hood at how they handle CSS. The results show which builders write clean, reusable code, and which ones still fill your HTML with redundant inline styles.

Inline styles apply CSS directly to elements via the style attribute. It’s quick but messy:
<div style="background: blue; padding: 20px; color: white;">Content</div>
Problems include bloated markup, slower performance, and painful maintenance when changing global styles.
Class-based styling uses reusable CSS classes applied to multiple elements:
.blue-box {
background: blue;
padding: 20px;
color: white;
}
Cleaner, faster, and easier to maintain — especially for global design consistency.

Based on data from the CSV analysis and testing (see code output from my script), here’s how the top builders stack up:
Let’s look at what makes each one stand out.
Oxygen Builder: Advanced class management, pseudo-selectors, and no bloat. Ideal for developers comfortable with CSS.
Bricks Builder: Visual, flexible, and clean code. Slightly easier learning curve than Oxygen and great for client handoff.
Breakdance: Modernized take on class-first building with stellar performance and intuitive controls.
Gutenberg & GeneratePress: Excellent for lightweight sites; native WordPress compatibility keeps code lean.
Beaver Builder: Stable, reliable, and supports classes manually — but doesn’t enforce them.
SeedProd: Great for landing pages. Supports CSS classes, but relies mostly on inline visual controls.
Thrive Architect: Focused on conversion, not code purity. Can use classes, but not by default.
Kadence Blocks: Built on Gutenberg’s structure — decent balance of flexibility and performance.
Elementor: Historically heavy on inline styles; Editor V4 aims to fix that with a class-based system. For now, still bloated.
Divi: Dynamic CSS improved load sizes dramatically, but inline styles persist. Great visuals, messy code.

I’ve built dozens of Kansas business websites — from Manhattan to Topeka — and I can tell you: class-based CSS is worth learning. Clean code makes your site faster, easier to manage, and better positioned for long-term growth. Whether you’re coding in Bricks or keeping it simple with Gutenberg, aim for reusable, well-structured CSS.
If you’d like help building a fast, professional WordPress site, you know who to call!