Link: https://github.com/T8RIN/ImageToolbox/releases/tag/3.7.0

Their description:

🖼️ Image Toolbox is a powerful app for advanced image manipulation. It offers dozens of features, from basic tools like crop and draw to filters, OCR, and a wide range of image processing options - Release 3.7.0 · T8RIN/ImageToolbox

The new features from the release:

What's Changed

• Added ability to pin color selector in color tools by #2489
• Added ability to enable primary lines for helper grid by #2489
• Added ability to fill outlined shapes with color in draw tool by #2492
• Added setting to hide tools in share menu by #2491
• Added 34k new color names
• Added color library to browse a vast collection of colors
• Added mix mode to warp brush in draw tool
• Added favorites sorting to tools arrangement setting by #2496
• Added 14 new AI models (upscaling and artifacts)
• Added more info about images in pickers
• Added 19 new PDF tools:
  • Merge
  • Split
  • Rotate
  • Rearrange
  • Page Numbering
  • Watermark
  • Signature
  • Compress
  • Grayscale
  • Repair
  • Protect
  • Unlock
  • Metadata
  • Remove Pages
  • Crop
  • Flatten
  • Zip
  • Print
  • PDF to Text (OCR)

What's the source of the "AI"? Is it strictly locally run?

no you provide your API

Looks like they use local models, I'm not sure what the other guy is talking about.