SpecialistExcels at automatically generating flashcards and practice quizzes from study notes, but lacks freehand drawing features.
CopilotKit records 403,148 monthly visits with +199.4% month-over-month growth and Freemium pricing. Goodnotes records 3,227,341 monthly visits with +10.8% growth and Freemium, Free Trial pricing.

Open-source frontend stack for building AI agents and copilots inside your own product
| Dimension / Metric | ![]() | ![]() |
|---|---|---|
| Official Domain | copilotkit.ai | goodnotes.com |
| Pricing Model | Freemium | Freemium, Free Trial |
| Monthly Visits | 403.15K (403,148) | 3.23M (3,227,341) |
| MoM Traffic Delta |
| +268.49K (+199.4%) |
| +314.75K (+10.8%) |
| Primary Market & Share | 🇺🇸 United States (18.9%) | 🇺🇸 United States (33.8%) |
|---|
| Direct Visits / mo | 179.26K | 1.64M |
|---|
| User Rating | 4.6 | 4.4 |
|---|
| Supported Platforms | Website | Website |
|---|

Open-source frontend stack for building AI agents and copilots inside your own product
Ship a working copilot UI in minutes with drop-in components for React, Angular, Vue, iOS, and Android, or go fully headless for total control over rendering.
A general-purpose bi-directional link between your app and any agent backend, with integrations for the OpenAI Agents SDK, Claude Agent SDK, LangChain, Google ADK, AWS Strands, Mastra, and many more.
Agents return real UI — charts, forms, tables, and approval prompts rendered with your own design system on the same screen the user is already working in.
Let agents read and write application state, call your frontend functions, and pause for human approval before sensitive actions are executed.

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.
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.
#2
SpecialistStronger online PDF editing and AI chat capabilities, but lacks tablet-optimized handwritten note-taking workflows.
#3SpecialistConverts notes and PDFs into quizzes and flashcards, but lacks stylus-based handwriting and sketching tools.

Provides gorgeous structured block-based document editing, but is built for typed text rather than handwritten notes.

Organizes notes into interconnected typed objects rather than traditional notebooks, but lacks handwritten ink support.
SpecialistCombines conversational workflow drafting with visual flow builders, focusing on workflow automation rather than frontend copilot embedding.

SpecialistUses an infinite visual canvas for note organization, but lacks Goodnotes' paper templates and PDF annotation polish.

Offers spatial whiteboards for organizing complex research, but lacks Goodnotes' freehand handwriting stylus support.

SpecialistIDE extension providing model-agnostic AI coding assistance rather than a frontend UI component library for web applications.

SpecialistFocuses on Python-based agent building and deployment rather than frontend React component integration for web applications.

SpecialistAutomatically converts lectures and PDFs into structured study guides, but lacks freehand ink and drawing tools.
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.
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.
Provides gorgeous structured block-based document editing, but is built for typed text rather than handwritten notes.
Organizes notes into interconnected typed objects rather than traditional notebooks, but lacks handwritten ink support.
SpecialistCombines conversational workflow drafting with visual flow builders, focusing on workflow automation rather than frontend copilot embedding.
SpecialistUses an infinite visual canvas for note organization, but lacks Goodnotes' paper templates and PDF annotation polish.
Offers spatial whiteboards for organizing complex research, but lacks Goodnotes' freehand handwriting stylus support.
SpecialistAutomatically converts lectures and PDFs into structured study guides, but lacks freehand ink and drawing tools.