Caspian

Here's a slightly expanded version, just over 1200 characters, same plain tone and no dashes:

Caspian is a note-taking app for notes that belong to a specific place on something visual.

Most tools store notes in folders or a graph, disconnected from whatever they're actually about. Caspian works the other way around. You import a picture, a map, a 3D model, or a webpage, drop a pin or draw a region directly onto it, and write your note in plain Markdown right there. To find a note later, you click its anchor on the image instead of searching through folders.

The same anchoring system works across every canvas type. A flat floor plan and a rotating 3D model both plug into the same underlying contract, so pinning a note behaves the same way whether the surface is 2D or 3D. Caspian doesn't try to standardize how a canvas looks, only how it links out to your notes.

Your notes stay yours. Every note is a plain Markdown file on your own disk, readable in any text editor. There's no account, no cloud requirement, and no lock-in. On first launch, you pick a vault folder, an ordinary directory on your machine, and that's the entire setup. Every note Caspian creates from then on lives inside that folder as a file you can open anywhere.

Caspian is early. This is version 0.1. Windows and Linux are available now, and macOS is coming soon.