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

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

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

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

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

A data annotation platform for building and evaluating AI datasets.

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

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

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

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

Collect and export PDF highlights and annotations

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

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

PDF reading and editing for Mac, iPhone, and iPad

PDF editing and review across desktop and mobile

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

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

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

PDF content editing and comment export across devices