Designer Tools Pro provides a suite of features to review and validate app specifications. Whether it be checking your keylines or that shade of blue, you’ll definitely want to add this app to your toolkit. Even if you provide redlines, these are a great way to verify each and every pixel.Grid Overlay – Quickly toggle on-screen grids to check layouts for inconsistent spacing or mis-aligned elements. You can even customize the grid size, grid line and keyline colors.