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

A data annotation platform for building and evaluating AI datasets.

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

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

Inspect multidimensional images with annotation overlays

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

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.

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

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.

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

Annotate and analyze complex bioimages

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

Prepare annotated screenshots while keeping the editable capture source.