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About ATC21S
40 free educational tools and 395+ printable coloring pages — made for teachers, parents, and curious kids.
Our Mission
At ATC21S, we believe that learning should be fun, accessible, and engaging for children of all ages. Our mission is to give teachers, parents, and students free, high-quality tools that make preparing and practicing lessons easier — no sign-ups, no subscriptions, no paywalls.
Free Educational Tools
ATC21S is first and foremost a collection of 40 free educational tools that run right in your browser:
- Worksheet generators: Handwriting, letter and name tracing, math practice, telling time, spelling tests, and more — type in your content and print
- Quiz and puzzle makers: Word searches, crosswords, multiple-choice quizzes, sudoku, word scrambles, and other ready-made activities
- Calculators: Grade calculators, percentage calculators, unit converters, and reading-time estimators
- Classroom helpers: Pomodoro timers, random name pickers, flashcard makers, and multiplication tables
Printable Coloring Pages
Coloring pages are where this site started, and they are still completely free. We offer 395+ printable pages covering:
- Letters A-Z: Multiple styles including uppercase, lowercase, bubbly, and calligraphy designs
- Numbers 0-100: Standard and calligraphy versions for counting and number recognition
- Days of the Week: Engaging activities for learning the weekly calendar cycle
- Traffic Signs: Road safety concepts introduced through coloring
- Country Flags: World geography and cultures through flag coloring pages
100% Free
Every tool and every coloring page on ATC21S is completely free to use, download, and print. We believe that quality educational resources should be accessible to everyone, regardless of their financial situation. There are no hidden fees, no accounts to create, and no limits on how much you can use.
Perfect For
Our resources are ideal for:
- Teachers preparing worksheets, quizzes, and classroom activities
- Parents looking for educational practice at home
- Homeschool families building curricula
- Daycare and preschool programs
- After-school programs and tutoring centers
- Students who need a quick calculator, timer, or study aid
Contact Us
Have questions, suggestions, or feedback? We would love to hear from you! Visit our Contact page to get in touch with our team.