ColorArt
A narrow tool that does one job properly: clean line art suitable for printing and coloring, from prompts or photos. Character consistency and batch generation are what separate it from a general image model, and the KDP builder is aimed at people selling coloring books, but selling the output is only licensed from the Artist tier or a yearly Hobby plan up. Credits, not pages, are what you actually buy.
Pros
- Takes text, photos or sketches as input and traces usable outlines from all three
- Keeps a character recognisable across a set of pages, which general image models struggle with
- Batch generation and a KDP book builder for people publishing at volume
- Watermark-free downloads on every paid tier including the cheapest
Cons
- Priced in credits, so the page counts quoted per tier assume you never retry a generation
- Commercial use, 4K and the KDP builder are held back from the cheaper monthly tiers
- No public API and no offline or desktop option
- The site names founders but no legal entity or country, so there is no accountable vendor on record