Color4u is an adult coloring book app that allows you to send a coloring page with a message that is revealed only to the receiver after they color the picture attached to the message.

For your Love

Send an I Love You picture to your love so they can color it and send it back.

For your enemies

Annoyed with a friend? Send a complex, time consuming picture to color.

For your Boss

Your Boss ask for assistance after office hours, reply to what they want with a thank you coloring page.

Unique and Original

Send secret with a coloring page

We created this special feature because many people gets job requests from their bosses in messaging apps during non-office hours. To encourage work-life balance, Color4u is the best tool to reply your bosses and make them to relax. Receiver need to color a page in order to get what they want to access, such as a link to a document.

Just like Stickers

Tons of coloring pages are desgined for expressiveness as stickers. Send it just like stickers in iMessage, and they are stickers need coloring from your friends.

Fill Level

Receiver must color at least 95% of the whole picture in order to reveal the secret message.

View Responses

Reciever must reply your message with a colored page before they can reveal the secret message. You can view how good or how bad your friends' coloring.


Colored pictures can be reuse for different secret messages you received. Color all our pictures and get ready to reveal any secret messages

Coloring Book for Adults

Color4u is also a high-quality coloring book on mobile, including 1500+ beautiful coloring pages. It is easy and ideal for destress and relax.

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Tons of picuters

1500+ pictures and 20+ categories for your selection. Category like Kawaii, Messages, Animals, Garden and many more! Not just Manadals.

Kawaii color palettes

Kawaii pastel palettes and create your own palettes.

Post-editing effects

Post-editing effects to turn your coloring pages into art.

Color by fill or stroke

Color by tap to fill or stroke to color. You can change the brush size and opacity in stroke mode.

Coloring Pages

Pre-defined Color Palettes

Post-editing effects

Custom Palettes

How it works

General FAQ

Questions related to Color4u

With the Premium subscription, you pay a low subscription fee to access all pictures and remove ads. You can try this experience for 3 days trial period.

You can cancel the subscription or the free trial anytime via the subscription settings through your iTunes account. Do it at least 24 hours before the end of the frial trial or subscription period to avoid being charged. If you want to know more about this, please read the information from the link below: