Browser-based tool for generating OpenGL and DirectX tangent-space normal maps from images
A native macOS drawing app for quick sketches, screenshot markup, and AI-generated diagrams
Stage
Not given
Not given
Founded
Not given
Not given
Based in
Not given
Not given
Pricing model
Free
Freemium
Pricing
Not given
Free: $0 forever, includes all drawing tools, unlimited sketches in one folder, copy to clipboard as PNG, and auto-save with local-first storage. Pro: coming soon.
Key features
Local image processing
OpenGL and DirectX output
Sobel and Scharr filters
Material lighting preview
PNG export
Smoothing and strength controls
Edge behavior control (clamp or wrap)
Tiled preview
Height inversion
Interactive light inspection
Instant copy-to-clipboard as PNG
No accounts or setup required
Local-first storage with auto-save
Screenshot annotation with arrows, boxes, text, and freehand tools
AI diagram generation via Claude, Cursor, Windsurf, and VS Code
Refine diagrams through chat
Paste screenshot from clipboard
Unlimited sketches in one folder
Native macOS performance
All drawing tools included in free version
What makes it different
Runs entirely in the browser with no server upload or account required
Supports both OpenGL and DirectX normal map formats
Choice of Sobel or Scharr gradient filters for different texture quality
Free with no advertising, AI model, or payment system
Interactive material lighting preview to verify results
Zero-friction design: open, draw, and share in seconds with no setup or accounts
Local-first architecture: all sketches stay on your Mac, nothing leaves unless you ask
AI integration runs through your own subscription with no proxying of prompts
Normal Map Bench
Chalk