Themerson
Overview
Themerson is a visual compiler for WordPress block themes.
It allows designers and developers to configure a robust theme foundation—colors, fluid typography, and spacing scales—visually, without writing a single line of theme.json. It exports a native, installable WordPress Full-Site Editing (FSE) theme with zero runtime bloat and zero vendor lock-in.
Why I’m building this
After years of building WordPress websites, I realized how much time is lost on repetitive technical tasks: wasting hours debugging nested JSON schemas just to change a color, calculating complex CSS clamp() functions for fluid typography, and manually translating design tokens from Figma into WordPress Global Styles.
I wanted a tool that handles the math and the boilerplate, generating standard WordPress code. This way, creators can skip the busywork and immediately start building layouts using the native Site Editor, instead of fighting proprietary page builders.
How it works
The workflow is designed to be simple and standard:
- Configure the foundation: Define your visual system in Themerson. The engine maps everything 1:1 to native WordPress core properties.
- Export a native theme: Download a clean, installable ZIP containing your
theme.json, styles, and templates. - Build natively: Install the theme on WordPress and build the website using the native Site Editor.
Zero lock-in. It is not a page builder. We don’t hijack the native editing experience or ship proprietary runtime CSS. If you uninstall Themerson, your theme lives forever without any dependencies.
Current Stage & What’s Next
The core engine that handles the mathematical generation of theme.json and fluid typography is actively being refined. The focus right now is on ensuring that the exported foundations are flawless and adhere perfectly to the latest WordPress FSE standards.
The next step is implementing more features like patterns, and more, giving WordPress professionals a tool they can rely on to build their WordPress FSE websites foundations.