TrueColours

Find pens for your colour-by-number books using the sets you already own—even across different brands.

Less matching. More colouring.

See how others approached the same pages and which pens they used. Share your work in rotating challenges, and put your own twist on familiar pages with new colour combinations.

About us

We’re Ylfa and Freek, a pharmacist and a teacher from the Netherlands, and parents to two young children. Ylfa wanted an easier way to choose pens for her colour-by-number books, so we made TrueColours together.

From the community

“I have never enjoyed colouring so much without any of the hassle as your colour matches from the start have been nothing but amazing.” — Emma, Wales, United Kingdom
“I absolutely LOVE your app!!!!!” — Tina, United States
“I’m so happy you’re doing this!! It takes soooo much time to work out the colours… lovely that I can start colouring right away!!” — Marjolijn, Netherlands

You need an account and an internet connection. Suggested matches are a guide: ink, paper, and lighting affect how colours look.