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Teach with an infinite, persistent whiteboard integrated into a virtual classroom.

Browser-based AI annotation tool that uses visual prompts to label objects across images.

A zoomable handwriting and planning notebook with sub-pages and document annotation.

A data annotation platform for building and evaluating AI datasets.

Teach on an infinite shared canvas with subject tools, document conversion, and reusable board templates.

Note taking tool with flashcards, PDF annotation, and AI study features

Share a collaborative whiteboard URL and work across unlimited pages with live audio, video, and document annotation.

Write and annotate handwritten notes on Android with page layouts, linked notes, and PDF tools.

PDF editing and review across desktop and mobile

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

A teaching whiteboard with video calls, lesson materials, and PDF or image annotation.

A privacy-first, open-source knowledge base for structured personal notes.

Write or sketch by hand, then convert, search, and organize the result.

Read study PDFs and make notes as part of one annotation workflow.

A handwriting notebook with note-linked audio, handwriting recognition, and PDF annotation.

An Android handwriting workspace with notebooks, PDF markup, sticky notes, and corkboards.

Windows PDF annotation with formulas and drawing measurements

Inspect multidimensional images with annotation overlays

Annotate and compare interpretations of a text corpus

Write with a stylus in flexible notebooks that can also hold and annotate PDFs.

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

PDF reading and editing for Mac, iPhone, and iPad

Note-taking app for handwriting, PDF annotation, and audio recording.

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