Colorkin

Colorkin turns personal photos into custom coloring books. Customers upload 6 to 20 photos and preview every page for free before buying, choosing between simple lines for young children or more detailed drawings for older kids and adults. Books can be downloaded as a PDF or ordered as a printed copy shipped to US addresses, with an optional dedication page and custom cover title. Images are drawn by the company's own AI rather than sent to outside services, and are deleted within 24 hours. Every book is checked before printing, and a full refund is offered within 60 days if customers are not satisfied.