Apps to PDF annotation

DEVONthink is a powerful document and knowledge management application for macOS. It helps users organize, store, and retrieve information from various sources, offering advanced search capabilities, AI-assisted connections, and robust syncing options to build a comprehensive personal information or research database.

Paperpile is a web-based reference manager designed for researchers and students. It streamlines the process of collecting, organizing, and citing research papers, with robust integration with Google Workspace and other popular academic tools.

Preview is the native image and PDF viewer for macOS. It offers essential tools for viewing, annotating, and basic editing of these file types directly within the Apple ecosystem. Designed for efficiency and low resource use, Preview provides a seamless and integrated experience for handling common document and image formats on Mac computers.

Nitro Reader is a free PDF reader packed with advanced features for creating, editing, and signing PDF documents. It offers a clean interface and robust functionality for everyday PDF tasks, including form filling, annotation, and text extraction.

Adobe Acrobat DC is the industry-leading solution for working with PDF documents. It allows users to create, edit, sign, share, and manage PDFs with advanced tools for professional workflows across desktop, web, and mobile.

Okular is a versatile document viewer from the KDE community, supporting a wide array of file formats including PDF, EPUB, DjVu, and TIFF. It offers intuitive navigation, robust annotation tools, and features like text selection and saving, making it a powerful tool for handling diverse document types.

Zotero is a free and open-source reference management software that helps users collect, organize, cite, and share their research sources. It integrates seamlessly with web browsers and word processors to streamline the research and writing process.

Diigo is a comprehensive online tool designed for researchers, students, and lifelong learners to collect, organize, annotate, and share information found on the web. It acts as a powerful bookmarking service combined with robust annotation capabilities for web pages, PDFs, and documents.

Mendeley is a freemium reference manager and academic social network designed for researchers. It helps organize, manage, and share research papers, generate citations, and collaborate on projects.

Qiqqa is a robust, award-winning research management software designed for academic and commercial researchers. It offers comprehensive tools for managing, annotating, and analyzing PDF documents, facilitating collaboration, bibliography generation, and knowledge discovery within research projects.

PDFill provides a comprehensive suite of tools for creating, editing, filling, and manipulating PDF documents. It acts as a versatile 'Swiss-army knife' for various PDF-related tasks, suitable for both basic and advanced users.

PDF-XChange Viewer is a versatile and lightweight PDF reader and editor. It offers a wide array of features for viewing, annotating, and manipulating PDF documents, including OCR capabilities and form filling, all within a user-friendly interface.

Adobe Acrobat Reader DC is the venerable and widely adopted standard for interacting with PDF documents. It provides robust tools for viewing, printing, signing, and commenting on PDF files across various devices and platforms.

Foxit Reader is a robust and feature-rich PDF reader and editor that provides users with a comprehensive set of tools for viewing, annotating, signing, and creating PDF documents. Known for its blend of performance and functionality, it caters to both casual users and professionals handling complex PDF workflows.

GoodReader is a powerful document reader and file manager for iOS, excelling in handling large PDF files, annotations, and secure cloud integration, ideal for professionals and students needing robust document management on the go.

Papers is a comprehensive document and reference management software designed for researchers, academics, and students. It helps you organize, curate, and cite your research materials efficiently, integrating tools for importing, annotating, and generating bibliographies.

Evernote is a popular cross-platform note-taking application designed to capture, organize, and manage your notes. It offers robust syncing capabilities across devices and includes features like web clipping, OCR for images, and integration with other services to streamline your productivity and information management.

Citavi is a comprehensive reference management and knowledge organization software designed for students, academics, and researchers. It facilitates the entire research process, from information gathering and organization to task management and bibliography generation, enhancing productivity and streamlining academic work.