Apps similar to Skim include SumatraPDF, which is free and open source. Other options are Okular, Foxit PDF Reader, Xournal++ and PDF-XChange Editor. PDF Readers like Skim are a crowded field, with more than 100 alternatives for Windows, Mac, Linux, Android and iPhone.
PDF Max is a desktop class PDF app for reading, annotating or signing PDF documents on your iPhone/iPad. Mark up documents with highlights and handwriting, insert texts and stamps, fill out, sign PDFs and even manipulate PDF pages.
pdfDocs integrates with business systems to efficiently assemble, secure and distribute documents in PDF and PDF/A format.
Australia
The simplest PDF viewer. Safe (doesn't require permissions), lightweight (just 6,9MB) and modern.
Italy
EU
SpeedyNote is a fast, open-source note-taking application designed for stylus users who need iPad-quality annotation on budget hardware. Built with native C++ and Qt, it delivers 360Hz stylus input on hardware as modest as an Intel Celeron N4000 at 1.
modern computer flatboat is a mobile pdf viewer written in Qt and using MuPDF's libfitz.
An all-in-one PDF editing software to create, manage and convert PDF files easily.
China
Discover Feather PDF, the ultimate PDF editor that prioritizes your privacy. Enjoy powerful editing features without data collection and gain lifetime access with a one-time payment.
Blazing fast PDF and portable eReader built on muPDF. Including the ability to save "highlights" and notes like on Kindle.
United States
xnotes is a handwriting-first notebook for phones and tablets, built for pen and stylus. Write, sketch and annotate with pressure-sensitive, variable-width ink, and nothing you draw is ever flattened.
India
Edit your PDF files quickly and intuitively. Open, edit, save or convert PDF files with PDFTool – it’s up to you.
Ashampoo PDF Free is a software for opening, reading, and creating PDF files. It includes a built-in printer driver for generating PDFs from any Windows application, a compact and fast PDF reader, and the ability to fill out interactive and static forms.
GermanyEU
A privacy-first, client-side PDF editor that runs in your browser. Edit, annotate, merge/split, compress to target sizes, OCR scanned PDFs, and convert files—no signup, no watermark.
Pakistan
