The short version
iColoring is a well-made tool drawer: photo-to-line-art, text-to-page, colorizer, worksheets, Perler patterns, and more. Each tool makes one image. CrayonMill makes one thing — a KDP-ready coloring book — and does the parts a publisher would otherwise do by hand.
| iColoring | CrayonMill | |
|---|---|---|
| Unit of work | One image | One book (24–300 art pages, up to 150 single-sided) |
| Topics | You write each prompt (bulk mode: paste up to 20, premium) | Planned from audience + theme, one style across the book |
| Resolution | 1K = 120 DPI, 2K = 240 DPI (premium) | 2550 × 3300 = 300 DPI, always |
| Line art format | Grayscale PNG | 1-bit (no gray pixels), enforced before export |
| Separate Image-to-PDF tool, no gutter | Built in, gutter by page count, print check | |
| Failed generations | Credits refunded | Credits refunded, page marked, one-tap regenerate |
| Photo to coloring page | Yes | No (deliberately) |
| Cover generator | Yes | No — see the cover size guide |
| Online coloring | Manual + AI colorizer | Planned (tap-to-fill player) |
| Free tier | Weekly credits, watermark, low resolution | First 4 pages free, full resolution, no watermark |
| Pricing | $9.99 / 300 credits per month and up | Credit packs, no subscription |
Where iColoring is the better pick
- If you want to turn a family photo into a coloring page, colorize a line drawing, or print a worksheet, iColoring has the tool and CrayonMill does not — CrayonMill has no photo-upload path at all.
- If you want a single page right now rather than a planned book, iColoring's per-image tools fit that faster than setting up a full audience-and-theme run.
Where CrayonMill is the better pick
- If the output is a book you will upload to KDP, the gap is the work between "I have 40 images" and "I have a file KDP is happy with": topic planning, style consistency, 300 DPI 1-bit output, and gutter by page count.
- If you want a resolution number you never have to check yourself, CrayonMill draws every page at 2550 × 3300 px natively — iColoring's 1K/2K presets top out at 120/240 DPI, both below what KDP recommends for a letter-size interior.
Sources
Last verified 2026-09-04. Updated 2026-09-04.