Download Specctr here
You will need to install this ZXP installer to run Specctr in Adobe
Object Spec: Color, font, line height, opacity and more.
Dimensions and Coordinates: Precise width and height, on the left, right, bottom or top.
Add Notes: Add custom notes to give extra details to any element.
Spec Text: Spec paragraph and text styles, including line height and letter spacing.
Spacing: Select two objects to spec the spacing between them, or select one object to spec the distance between an object and it's artboard.
Sync: Get the latest version of Specctr panel on the cloud. Use Projects Beta to sync and share with your team.