Check a build against the design

Compare the live page with the design using real values, then hand developers a list they can fix in one pass.

Steps

Start with the whole page
Open Colors, type and contrast. Off-palette colors and type sizes that are not in your scale are the fastest wins.
Then check components
Use the inspector on each component: padding, gaps, radius, font size and line height. Turn on the outline debugger when alignment looks off.
Check every breakpoint
Open the responsive preview to see phone, tablet and desktop at once. Spacing problems often show at one size.
Report with evidence
Take a region screenshot of each issue, mark it up, and add the value you saw next to the value you expected.

Check	Where in Traceo
Colors match the palette	Colors view
Headings and body follow the type scale	Typography view
Text passes contrast (AA)	Contrast scanner
Padding, gaps and radius match	Element inspector
Nothing overflows or misaligns	Outline debugger
Layout holds at each breakpoint	Responsive preview