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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.

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

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

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

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.

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

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

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

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

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

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

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

PDF reading and editing for Mac, iPhone, and iPad

PDF editing and review across desktop and mobile

Online AI vocal remover for songs