Header Helper 1.4 for Mac can be downloaded from our website for free. The software lies within Developer Tools, more precisely Webmaster Tools.
From the developer:
Header Helper helps you to design, customize and edit headers.
- Select a background color & opacity or apply a vertical gradient.
- Border controls for 10 styles, corner radius, border width & border color.
- Advanced controls to ignore headings in header & sidebar areas.
You may want to check out more Mac applications, such as Sift Heads, Head for Gmail or Head for Instagram, which might be related to Header Helper.