Core capabilities

Fast enough to stay out of the way. Focused enough to feel opinionated.

A product surface tuned for reading, reviewing, and navigating technical docs.

KatanA emphasizes viewer-first clarity while still supporting the workflows that matter most in documentation-driven engineering teams.

Viewer-first release goal

Diagram support built in

Workspace navigation

feature / grid

What KatanA does today

Edit and inspect rendered Markdown side by side with a flow optimized for review and confirmation.

Mermaid, PlantUML, and Draw.io blocks are part of the expected workflow, not fringe features.

Open a folder, navigate a file tree, and move across documents without leaving the context of the workspace.

The app ships with English and Japanese UI so teams can work in the language that fits their environment.

KatanA is built with Rust and egui, not Electron. The product stays close to a single native binary.

The release history documents export to HTML, PDF, PNG, and JPG, which pushes KatanA beyond a simple preview-only tool.

The app surface includes changelog visibility, built-in update checks, and the documented auto-updater path.

diagram / setup

The product supports Mermaid, PlantUML, and Draw.io, but the setup story differs by renderer.

Install Mermaid CLI globally and KatanA can detect `mmdc` automatically.

PlantUML needs a Java runtime, and the app can download `plantuml.jar` from inside the viewer flow.

Draw.io content stays in the normal path without extra setup beyond the app itself.

positioning