
The AI workspace where teams and agents get work done together
Causal records 9,922 monthly visits with +33.3% month-over-month growth and Free pricing. Goodnotes records 3,227,341 monthly visits with +10.8% growth and Freemium, Free Trial pricing.

An infinite AI canvas that turns scattered ideas into finished plans
| Dimension / Metric | ![]() | ![]() |
|---|---|---|
| Official Domain | causal.so | goodnotes.com |
| Pricing Model | Free | Freemium, Free Trial |
| Monthly Visits | 9.92K (9,922) | 3.23M (3,227,341) |
| MoM Traffic Delta | +2.48K (+33.3%) | +314.75K (+10.8%) |
| Primary Market & Share | 🇺🇸 United States (66.4%) | 🇺🇸 United States (33.8%) |
| Direct Visits / mo | 3.35K | 1.64M |
| User Rating | 4.4 | 4.4 |
| Supported Platforms | Website | Website |

An infinite AI canvas that turns scattered ideas into finished plans
Notes, images, videos, links, colours, audio memos with transcription, and freehand drawing all live on one pan-and-zoom board.
The agent reads the whole board, not just the current note, so it can summarise a project, answer questions about it and write structured cards into your layout.
Jump straight into a video brief, app flow, website plan, storyboard, roadmap, moodboard, competitor research or weekly planner.
Embed lightweight interactive elements such as skill meters, status views and to-dos directly inside the canvas.

Handwritten notes, PDF markup, and AI study tools on one canvas
Low-latency ink with palm rejection, cross-out to erase, and handwriting-to-text conversion keeps writing close to pen on paper.
Import contracts, papers, or textbooks and mark them up by hand, with searchable annotations and clean exports.
Search across typed text, handwriting, and sketches, and turn notes into summaries, mind maps, or structured plans.
Work together in shared notebooks, documents, and whiteboards simultaneously, without version conflicts or file ping-pong.

The AI workspace where teams and agents get work done together
An AI-powered visual workspace where teams think, plan, and build together
SpecialistExcels at automatically generating flashcards and practice quizzes from study notes, but lacks freehand drawing features.
SpecialistExcels at automatically generating flashcards and practice quizzes from study notes, but lacks freehand drawing features.

SpecialistTurns course materials into interactive AI study tools, but focuses less on handwritten digital notebooks.
SpecialistTurns course materials into interactive AI study tools, but focuses less on handwritten digital notebooks.

SpecialistStronger online PDF editing and AI chat capabilities, but lacks tablet-optimized handwritten note-taking workflows.
SpecialistStronger online PDF editing and AI chat capabilities, but lacks tablet-optimized handwritten note-taking workflows.
SpecialistConverts notes and PDFs into quizzes and flashcards, but lacks stylus-based handwriting and sketching tools.
SpecialistConverts notes and PDFs into quizzes and flashcards, but lacks stylus-based handwriting and sketching tools.

The collaborative whiteboard built for product builders
Provides gorgeous structured block-based document editing, but is built for typed text rather than handwritten notes.
Provides gorgeous structured block-based document editing, but is built for typed text rather than handwritten notes.
Turn one prompt into live business apps, AI agents and automated workflows

Organizes notes into interconnected typed objects rather than traditional notebooks, but lacks handwritten ink support.
Organizes notes into interconnected typed objects rather than traditional notebooks, but lacks handwritten ink support.

An agentic AI workspace built as a canvas for deep work
An agentic AI workspace built as a canvas for deep work
AI visual workspace that turns a single prompt into full project boards