App Version: 1.0

Version Release Date: 27 April 2026

Workspace Last Saved: Never

MoYa ("Mosaic Yarncraft") is an application developed by Ari Rapkin Blenkhorn (ari@acm.org) to aid yarn-crafters who want to design patterns which can be used for mosaic knitting/crochet/etc. Mosaic crafting is worked in two contrasting colors of yarn, using only one color per row, alternating rows. A stitch which is the wrong color for a row is permitted only if the stitches above and below match it, as it is worked by creating a long stitch which connects those two stitches.

MoYa is a work in progress, under active development. Feedback is encouraged!

• Set the size of your chart in stitches and rows, for a chart that can be used for any craft. Or set it in physical inches based on your personal row/stitch gauge in your chosen craft, and display with non-square stiches. Zoom and pan to see your chart easily.
• To create your design, you can ...
  -- Click to toggle stitches, or click and drag to draw in Color B. Work one stitch at a time, or use a larger square "brush".
  -- Create symmetric designs or mosaic-in-the-round by mirroring stitches from one drawing area to the rest of the image.
  -- Import an existing bitmap as your chart, then modify it.
  -- Import a background reference image, and draw over the reference image to create your chart.
  -- Turn a reference image into a chart in one step with automatic algorithms such as threshholding and dithering.
• Check whether your chart is valid for mosaic yarn-crafting. Visual feedback updates as you modify the design.
• Display your chart in black and white (the default) or set your palette to reflect the actual yarns being used.
• Save your chart as a simple pixel map. Or add row and stitch numbers, long-stitch markers, and row-color indicators, and save as image or PDF.