CustomGPT OS records 18,928,488 monthly visits with +5.9% month-over-month growth and Paid pricing. Goodnotes records 3,227,341 monthly visits with +10.8% growth and Freemium, Free Trial pricing.
A Notion-based operating system for building, organizing and monetizing Custom GPTs
Handwritten notes, PDF markup, and AI study tools on one canvas
| Dimension / Metric | | |
|---|---|---|
| Official Domain | gumroad.com | goodnotes.com |
| Pricing Model | Paid | Freemium, Free Trial |
| Monthly Visits | 18.93M (18,928,488) | 3.23M (3,227,341) |
| MoM Traffic Delta | +1.06M (+5.9%) | +314.75K (+10.8%) |
| Primary Market & Share | 🇺🇸 United States (30.9%) | 🇺🇸 United States (33.8%) |
| Direct Visits / mo | 8.17M | 1.64M |
| User Rating | 3.8 | 4.4 |
| Supported Platforms | Website | Website |
A Notion-based operating system for building, organizing and monetizing Custom GPTs
Keeps tutorials, use cases and templates organized so you can reuse your best resources instead of starting from scratch every time.
A dedicated space to generate, capture and revisit Custom GPT ideas so promising concepts never get lost in scattered notes.
A structured build pipeline plus version tracking so you can iterate on a GPT and safely roll back or compare earlier versions.
One central view that lists and manages every active GPT you run, removing the need to hunt through separate tools or bookmarks.
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.
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.
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.
Buy a prompt that already works - or sell the ones you have perfected.
Buy a prompt that already works - or sell the ones you have perfected.
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.
SpecialistUses an infinite visual canvas for note organization, but lacks Goodnotes' paper templates and PDF annotation polish.
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.
Offers spatial whiteboards for organizing complex research, but lacks Goodnotes' freehand handwriting stylus support.
Free / Open-sourceMarketplace to find, hire, or build AI agents for real work
Free / Open-sourceMarketplace to find, hire, or build AI agents for real work
SpecialistAutomatically converts lectures and PDFs into structured study guides, but lacks freehand ink and drawing tools.
SpecialistAutomatically converts lectures and PDFs into structured study guides, but lacks freehand ink and drawing tools.
Free / Open-sourceFree, community-curated AI prompt library for ChatGPT, Claude and Gemini
Free / Open-sourceFree, community-curated AI prompt library for ChatGPT, Claude and Gemini
