Scored on real color science
Crayon choices are compared to each drawing's natural colors in CIELAB using CIEDE2000, so being close earns real credit instead of a flat wrong answer.
Learn Colors by Coloring
Color Fill
A free iPhone coloring game for ages 3–7 that teaches color sense: pick a crayon, tap a part of the picture, and get stars for how well the colors actually suit what you are coloring — 100 levels, no ads, no account, and nothing leaves the device.
In ReviewEducationiPhone
What it does
Color Fill is a coloring game that quietly teaches color sense. A drawing appears as plain line art; the child picks a crayon, taps a part of the picture, and it fills in. When the drawing is finished, they earn one to three stars based on how well the colors they chose actually suit the subject.
The scoring is the part that makes it a game rather than a colouring book. Instead of a simple right-or-wrong check, Color Fill converts both the chosen crayon and the drawing's natural colors into CIELAB and compares them with CIEDE2000 — the standard measure of how different two colors look to the human eye. A deep crimson on an apple scores nearly full marks; orange still earns most of a star; blue does not. Children get credit for being close, which is what keeps them trying again.
It is also deliberately fair. Every region accepts several correct answers, because an apple is genuinely red or green or yellow, and a child who colors a green apple has not made a mistake. Finishing a drawing always earns at least one star, and a separate Free Coloring mode has no scoring at all — for the youngest players, who are not ready to be judged and should not have to be.
There are 100 drawings across ten themed worlds, from a first sun and apple through animals, vehicles, the ocean and a rainbow castle. Each color is spoken aloud as it is picked, which is the part that actually teaches the names. Finished drawings stay on the level map in the colors the child chose, so the map becomes a gallery of their own work.
Who it is for
- Children roughly 3 to 7 years old
- Parents who want a quiet, ad-free app they do not have to supervise
- Anyone teaching color names and early color sense
- Families who want an app that works with no signal, on a plane or in a car
- Levels
- 100
- Colorable parts
- 424
- Data collected
- None
- Price
- Free
Built with
- SwiftUI
- iOS 17+
- Core Graphics
- AVFoundation
- CIELAB / CIEDE2000
Features
Everything included
Color Fill is built around a small number of things done thoroughly, rather than a long list done partially.
More than one right answer
Every part of a drawing accepts several correct colors. A green apple scores just as well as a red one.
100 levels, ten worlds
A hundred hand-drawn pictures grouped into themed worlds, growing from two simple parts to eight, with bigger crayon boxes as they go.
Colors spoken aloud
Each color is named out loud as it is picked — the part of the loop that actually teaches the words.
Free Coloring mode
No scoring, no stars, no wrong answers. Somewhere a three-year-old can simply play.
Their own gallery
Finished drawings stay on the map in the colors the child chose, so they can see everything they have made.
Privacy
Your data stays yours
A short summary of how Color Fill handles privacy. The full policy has the details.
Use cases
Where it earns its place
The situations this was designed around, drawn from how teams actually work today.
Learning color names
Every crayon is spoken aloud when picked, pairing the word with the color again and again without it feeling like a lesson.
Quiet time that is actually quiet
No ads, no pop-ups, no links out, nothing asking to be bought. It can be handed over without being watched.
Travelling with no signal
The whole game is on the device. It works in aeroplane mode, underground, and anywhere with no connection at all.
Building early confidence
Finishing always earns at least one star, and Free Coloring cannot be failed, so a young child is never told they got it wrong.
Roadmap
Where it stands
Current target: Submitted for App Store review.
1.0
Complete100 levels across ten worlds
The full game: perceptual color scoring, spoken color names, free play, and a level map that shows the child's own finished artwork.
1.1
In progressMore drawings and a sticker book
Additional themed worlds and a collectable reward for finishing each one.
Later
In progressMore languages
Spoken color names and prompts in languages beyond English.
In Review · Submitted for App Store review
Get early access to Color Fill
Join the launch list and you will be contacted in order as beta capacity opens. No spam, and unsubscribing takes one click.
Free, with no in-app purchases and no subscription.
Works fully offline — no connection needed at any point.
Designed for iPhone, iOS 17 and later.