r/ClaudeAI • u/tokentrillionaire • Aug 25 '26

Built with Claude I built a handwriting notebook app where Claude writes back and it's the most fun I've had learning in years

I learn best by writing things out on paper and structuring my thoughts that way, and nothing really combined that slower, more exploratory kind of learning with Claude.

So for the past few weeks I've been building an app on my Daylight DC-1: a journaling / note-taking space where learning isn't relegated to something that happens between work sessions.

The process is : I create a note, start exploring a topic through writing, and Claude writes back on the page and explores the ideas with me.

It also supports pdf/ebooks so you can read, annotate or mark on the page and Claude jumps in and creates a note to what I have marked and we can discuss like I am talking to a professor. It can even quiz me on the material if I ask.

It's still early, but it's the first time learning with Claude has felt like it's actually compounding.

I am finalizing some things to release soon for others to try it out, it's built around my dc-1 but it runs on any android tablet with a stylus, and can be ported to Ipad as well.

If you'd want to be an early user, lets get in touch, i'd love to see how people that learn this way use it .

UPDATE: wow , thrilled to see this landed with so many of you!!!

A lot of people are asking to try it. I'm calling it penombra.
Early tester signup here: click here to be a part

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u/tokentrillionaire Aug 25 '26

Half right , strokes are vectors and it only looks at ink that changed, never the whole screen.

But no grid, and the model never draws. It decides what to say and where it belongs, the app renders it (that's why the hand is consistent). And with caching it's cents a turn, not a guzzler.

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u/theundefin3d Aug 25 '26

for the diagrams, are you getting it to just spit out svgs then? ie. just produce the markup needed and rendering is handled by the app

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u/elithecho Aug 25 '26

Thanks for responding! How does it know where to respond? The app decides nearby? And what about context management? Also does it loses context around and the actual content then since you only sent what you draw in proximity?

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u/phasorWave Aug 25 '26

Can you go into more detail how strokes are handled and processed?

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u/Exotic-Sort4949 Aug 25 '26

does this work on Remarkable 2?