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Why is something as simple as editing a PDF so expensive? If it isn't Adobe Acrobat, it's some other online tool trying to enlist you for a subscription to manage your Portable Document Formats. But PDF Expert? They offer a lifetime subscription, so you can just download the app to your Mac and keep it for life.

Normally they charge $139.99, but StackSocial offers this lifetime PDF tool for just $79.99. You'd be hard pressed to find a lower price anywhere else. The best part? You can use PDF Expert on unlimited devices, so your subscription is valid even after you upgrade your Mac.

PDF Expert isn't anything flashy -- it's a Mac PDF editor with a user-friendly interface so you can find what you need and get the task done as painlessly as possible. Edit text, images, and links; annotate documents; organize pages; convert PDFs; fill out forms; and use OCR to recognize text in scanned documents.

You don't have to pay premium subscription prices when a PDF Expert lifetime subscription is only $79.99 on StackSocial (reg. $139.99).