ByteEditor 17 Release: Rebuilt for Umbraco 17, with a New Design Token System

A New Foundation: Umbraco 17 & .NET 10 

ByteEditor now runs on Umbraco 17 LTS and .NET 10, so you get everything that comes with it: a faster, more modern backoffice, longer-term support, and a codebase that's set up for what Umbraco builds next rather than chasing a framework Umbraco itself has moved on from. If you're running an older Umbraco 13 site today, this release is your path onto current, supported infrastructure. 

Design Builder Moves to a Token-Based System 

This is the biggest architectural change in this release, so we want to be upfront about it.

In previous versions, Design Builder was a visual, drag-and-drop canvas for styling your site. In ByteEditor 17, theming is built around a structured system of design tokens — every color, heading style, button state, and font is a single named value, edited in one place, and every block on your site reads from that same source automatically.

The practical effect: when you change a token, every block using it updates immediately and consistently, site-wide. It's what makes the new per-block "Theme Variant" control (below) possible — a card can switch between your base, accent, or muted color variant instantly, because it's pulling from the same tokens as everything else, not a locally copied style.

What this release does not have yet is the old live, visual drag-and-drop theme canvas — editing tokens right now means working with a structured JSON editor rather than using color swatches with a live preview. We made this trade-off to get a design system that's consistent and reliable across an entire site as we rebuilt for the new backoffice, and a more visual layer on top of this same token system is something we're actively looking at for a future release.

Live SEO Insights, Split into Tabs 

Every page now has two live analysis tabs sitting right next to your content editor:

• SEO Page Structure reads every heading on the page — before you've even saved — and lays out the full H1 through H6 outline, with a jump-to link next to each one that takes you straight back to that block in the canvas.
• Content Stats shows your most-used words with frequency counts, total character and word counts, and flags it for you if the page is thin on content for SEO purposes.

Both update live as you edit, with no save or refresh required. Change a block's heading level and watch the outline update in real time. It's the kind of feedback that used to mean pulling a page into a separate SEO tool — now it's built into the editor you're already using.

Per-Block Theme Variants (Replacing Styles) 

Every themeable block now has its own Styling section with a Theme Variant dropdown — base, accent, muted, or inverse — so a single card, banner, or layout block can stand out from the rest of the page without you touching a single line of CSS. Switch the variant and the block re-renders instantly against your site's actual design tokens. 

One Feature We've Paused: Animations