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Write naturally by hand and add PDF pages to notes for markup.

A browser-based shared math canvas for handwriting, graphs, sliders, and PDF assignments.

A multi-format notebook for handwriting, PDFs, voice notes, and study documents.

A local-first knowledge notebook that combines text, handwriting, boards, and linked notes.

An open-source iPad notebook for Apple Pencil writing and PDF markup.

Write with Apple Pencil in an Obsidian vault and keep handwritten pages beside Markdown notes.

A shareable infinite drawing board for handwriting, tutoring, diagrams, and PDF markup.

Handwritten study notes, PDF markup, audio capture, and AI-assisted review for students.

Prepare annotated screenshots while keeping the editable capture source.

Capture and present Windows screenshots with an integrated design-tool set.

Capture Linux interfaces and mark the steps that matter.

Annotate and style screenshots across desktop platforms.

A collaborative sketchboard that connects shared ideas to projects and tasks.

A developer SDK for embedding a real-time, collaborative whiteboard into web, mobile, and desktop applications.

A handwritten notebook for Apple Pencil notes, PDF markup, study tools, and creative pages.

Capture, annotate and conceal details in Windows screenshots.

An open-source academic notebook that brings Markdown notes, PDF annotations, and literature management together.

A browser-installed notebook for handwriting, PDF markup, and recorded lectures that works offline.

An open-source notebook with a freeform canvas, handwriting, Markdown, and local files.

Evaluate, monitor, and govern LLM apps in one workspace

An iPhone and iPad notebook for handwriting, PDF markup, audio notes, and searchable study material.

PDF reading, forms, and annotations on mobile devices

PDF content editing and comment export across devices

Annotate and analyze complex bioimages