Sites and apps similar to PDFSimplified include SumatraPDF, which is free and open source. Other options are Okular, Foxit PDF Reader, Canva and Xournal++. PDF Readers like PDFSimplified are a crowded field, with more than 50 alternatives for Windows, Mac, Linux, Android and iPhone.
PDF viewer for macOS supports scientific papers, annotations, highlights, bookmarks, split view, exporting notes, AppleScript, multiple annotation types, bibliography integration, full-screen, search, and compatibility with various macOS versions.
Paperwork is a personal document manager for scanned documents (and PDFs).
France
EU
Simple Android PDF viewer based on pdf.js and content providers. The app doesn't require any permissions.
Canada
Xodo is the ultimate cross-platform PDF viewer and annotator. Powerful, fast, and optimized for all phones and tablets, Xodo makes it easy to access, edit, share, sync, manage, sign, and more.
Canada
Create, Convert, Review and Edit PDF Documents on Windows, macOS, and Linux.
United States
Read, annotate, and highlight PDFs, fill interactive forms with saved input, underline or strike through text, manage bookmarks, sync files from cloud services, and share documents. Compatible with Preview and Adobe Acrobat annotations, supporting extensive iOS features.
Ukraine
A document viewer for the GNOME desktop. You can view, search or annotate documents in many different formats.
United States
Nitro offers comprehensive PDF solutions for editing, creating, and converting, alongside OCR and e-signature tools. Supports Mac, Windows, and iOS, providing a user-friendly interface with industry-standard security features. Ideal as an Adobe Acrobat alternative.
United States
Document Viewer is a highly customizable document viewer for Android, fork of the last GPL version of EBookDroid .
GermanyEU
PdfDing is a browser based PDF manager, viewer and editor that you can host yourself. It offers a seamless user experience on multiple devices. It's designed be to be minimal, fast, and easy to set up using Docker.
Comprehensive suite offering eSign, OCR, multi-platform editing, cloud integration, and robust security. Ideal for professional or personal use, facilitating collaboration while protecting content.
United States
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.
