PDFpen is a PDF editor for macOS and iOS. It allows users to create, edit, annotate, and sign PDF documents. It offers a range of features, including :

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Editing text and images:

Modify existing text and images within PDFs, adding or removing content as needed.
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Annotating:

Add comments, highlights, underlines, strikethroughs, and other annotations to PDFs for review and collaboration.
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Form filling and signing:

Fill out interactive forms and add digital signatures.
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Optical Character Recognition (OCR):

Convert scanned documents into editable text.
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Creating PDFs:

Generate PDFs from various file types.
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Security features:

Password protection and other security options to control access to your documents.

Essentially, PDFpen aims to provide a comprehensive PDF solution for users who need more than just basic viewing capabilities. It sits somewhere between a simple PDF viewer and a full-fledged professional PDF editing suite like Adobe Acrobat Pro.