I run a small site called Coloring Sunny where families download printable coloring pages. For a long time the only way to use those pages was to print them. That works well at a desk with crayons, but it falls apart on a road trip, at a restaurant, or when the printer is out of ink. So I built a coloring tool that runs right in the browser, and this post covers what it does, how kids use it, and where Iām taking it next.
What I built
The tool lives at coloringsunny. The idea is simple: pick a themed canvas, fill it with color, and save your finished artwork. There is nothing to install and no account is needed to start. Your progress stays in your browser, so a child can close the tab for dinner and come back to the same picture later.
Right now there are around 415 canvases split into three collections. Holidays has 69, Movies and TV has 93, and Seasons has 253. Inside each collection you find smaller themes like Christmas, Gingerbread, Halloween, Pumpkin, Autumn, Snowman and Thanksgiving. Every theme is marked for all ages, because the same drawing can be a quick activity for a five year old and a relaxing project for a parent.
How kids can use it
The flow is meant to be obvious enough that a child can start without help.
- Open the online coloring page and choose a collection.
- Pick a theme, such as Fall or Halloween.
- Tap a canvas to open it.
- Fill the picture with color, taking as long as you like.
- Save the finished artwork when you are happy with it.
Younger children tend to enjoy big open shapes and bold colors, so I would point them to the Cozy and Gingerbread themes first. Older kids can go for the busier scenes in Autumn or Winter, which have a lot more small areas to work through. Because the pages are drawn and checked in house, there are no messy lines that make a picture frustrating to finish.
For parents and teachers, it also works as a screen time option that feels creative instead of passive. A classroom can pick a seasonal theme for the week, and each student can color their own copy on a tablet or laptop.
Why a PWA
A coloring tool is a perfect fit for a progressive web app. Kids use tablets and phones more than anything else, and a PWA gives you an app like experience without asking parents to visit a store, find the right listing and download something. You open a link, and later you can add it to the home screen so it launches like any other app, full screen and without browser clutter.
The web also keeps the project simple for me as a solo developer. One codebase, one deploy, and every device gets the update at the same time.
Working on the offline version
This is the part I am busiest with right now. The online version needs a connection, and that is exactly the situation where kids most want something to do: on a plane, in a car, or somewhere with weak signal.
The plan has three parts:
Cache the app itself so it opens instantly with no network at all.
Let families save a handful of favorite canvases to the device ahead of time, instead of downloading all 415 and filling up storage.
Keep saved progress on the device and sync it later if the child signs in.
The tricky piece is deciding what to cache and when. Images are the heavy part, so I want the app to fetch canvases only when a family asks for them, and to clean up old ones so a tablet never runs out of room. Handling updates matters too. If I fix a bug or add new pages, an offline user should get the new version the next time they connect, without being stuck on an old copy.
What comes next
After offline support I want to look at better saving and sharing of finished artwork, plus more seasonal canvases as the year moves along. If you build things for kids, I would love to hear what worked for you, especially around storage limits and offline behavior on older tablets.
You can try the tool here: PWA Coloring Tool
If your child tries it, tell me how it went in the comments. Real feedback from small users is the most useful thing I can get.
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