Copyright & credits

ED Cat is designed and built by Kartik Chilkoti.

Copyright

© 2026 Kartik Chilkoti. The ED Cat app, its design, the cat character, the animated lessons, the step-by-step explanations, the drawings and the source code are the work of the author and are protected by copyright. All rights reserved.

What you may do

• Use the app for your own studies, for free.
• Download the PDF sheets and copy the drawings onto your own drawing sheets for class submission.
• Share the link edrawing.me with classmates and teachers.

What you may not do

• Copy, re-publish or sell the app, its lessons, drawings or code, or present them as your own, without written permission from the author.
• Remove the credits or the ED Cat name from downloaded sheets that you share publicly.

Credits

• Drawing conventions: first-angle projection and line types follow BIS SP 46 (Engineering Drawing Practice for Schools and Colleges). Questions follow the first-year Engineering Drawing syllabus.
• Lecture videos: belong to their creators on YouTube and play through YouTube's own player.
• Fonts: IBM Plex Sans and IBM Plex Mono (SIL Open Font License).
• Built with: Next.js, React, Clerk (sign-in), Supabase (database), Tesseract.js (on-device text reading) and jsPDF. Hosted on Vercel.

Contact

Questions, permission requests or a mistake in a drawing? Use the “Spotted a mistake?” button on any step inside the app, or contact Kartik Chilkoti.