SpecialistExcels at automatically generating flashcards and practice quizzes from study notes, but lacks freehand drawing features.
Goodnotes records 3,227,341 monthly visits with +10.8% month-over-month growth and Freemium, Free Trial pricing. Quensus records 548 monthly visits with -74.3% growth and Freemium pricing.

AI-powered water leak detection and smart water management for buildings
| Dimension / Metric | ![]() | ![]() |
|---|---|---|
| Official Domain | goodnotes.com | quensus.com |
| Pricing Model | Freemium, Free Trial | Freemium |
| Monthly Visits | 3.23M (3,227,341) | 548 (548) |
| MoM Traffic Delta |
| +314.75K (+10.8%) |
| -1.58K (-74.3%) |
| Primary Market & Share | 🇺🇸 United States (33.8%) | 🇺🇸 United States (66.8%) |
|---|
| Direct Visits / mo | 1.64M | 212 |
|---|
| User Rating | 4.4 | 4.3 |
|---|
| Supported Platforms | Website | Website |
|---|

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.

AI-powered water leak detection and smart water management for buildings
Real-time water insights with remote notifications and detailed consumption data, delivering leak prevention and control from wherever you are.
WRAS-approved control valves work with the monitoring platform to cut the water supply when a leak or abnormal flow pattern is detected.
A range of flow sensors and sub-meters for accurate, reliable measurement across different pipe sizes and fluid applications.
Cable that senses the presence of water along its length and can trigger automatic shut-off when paired with the control system.
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.
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.
Free Airbnb analytics, STR revenue estimates and AI dynamic pricing

AI agents that detect, monitor and inspect anything you can see from the sky

AI-powered cloud DLP and security awareness training for SaaS environments
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.
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.
Free Airbnb analytics, STR revenue estimates and AI dynamic pricing
AI agents that detect, monitor and inspect anything you can see from the sky
AI-powered cloud DLP and security awareness training for SaaS environments