Figma Dev Mode: Visually Diff Your UI

WHY IT EXISTS The design-to-dev handoff is rarely a single event; it's an iterative process. Designs often change after the first implementation, leading to drift between the design file and the production code. This feature was created to give developers a clear, unambiguous way to see exactly what has changed since they last looked at a file.

THE MENTAL MODEL Think of it as git diff for your UI. Instead of a purely text-based comparison, you get a visual side-by-side or overlay view of the components. This is combined with a list of changed properties and updated code snippets for each modified element, giving you a complete picture of the changes.

HOW IT WORKS Select a top-level frame or component and click "Compare changes" in the Dev Mode Inspect panel. A modal opens with a timeline of the file's version history. When you select a previous version, Figma shows you what's different. You get two main views: a side-by-side comparison and an overlay view which is great for spotting minor pixel shifts. The "Layers" panel lists every element that was Added, Edited, or Deleted. Selecting a layer in this list reveals the most important part: the specific property and code diffs. You can also compare any two components on the canvas by holding Shift while selecting them.

WHEN TO USE IT Use this at the start of a new sprint or task to catch up on design changes. It's essential for verifying that the implemented UI matches the final design version, not an earlier one. Use it whenever you suspect a design has been updated but aren't sure what's new, eliminating the need to ask a designer "what changed?".

WHEN NOT TO USE IT This feature is for comparing concrete changes within a file's history or between two existing components. It's not for abstract design exploration or comparing files that don't share a common history. The feature requires a paid Figma plan and a Full or Dev seat.

ONE CANONICAL EXAMPLE A designer updates a button component, changing the corner radius from 4px to 8px and the background color. As a developer, you open Dev Mode and click "Compare changes". You see the button listed under "Edited". Selecting it shows a side-by-side visual of the old and new button. More importantly, the properties panel highlights borderRadius: 4px -> 8px and the new color value, and the code snippet panel shows the updated CSS you need.