"Need to jot down a quick idea?"
"Want to organize complex thoughts by hand?"
"Tired of bland smartphone memo apps?"

For you, we present a lightweight, simple, yet powerful blackboard app, now better than ever.
Open the app, and you'll find a nostalgic, deep green blackboard. The smooth and satisfying drawing experience, just like using real chalk, will accelerate your thinking.

◆ Features of "Kokuban Taisho" ◆

1. Just Like the Real Thing: A Natural, Smooth Drawing Experience
Enjoy the seamless feeling of writing with your fingertip, with lines that follow your every move, recreating the classic blackboard experience. Choose between two line thicknesses ("Fine" and "Bold") and two classic colors ("White" and "Red"). Switch between them with a single tap to match your expression. By leveraging the latest Jetpack Compose technology and maximizing GPU performance, we've achieved a stress-free, fluid drawing experience.

2. Write, Erase, and Write Again: Intuitive Tools

Partial Erase (Eraser): A "board eraser" that lets you wipe away just the parts you want by tracing over them with your finger.

Full Erase (Board Monitor): With one tap of the "Board Monitor, please erase!" button, clear everything you've written. Start fresh with a clean blackboard for your next big idea.

3. Save Up to 30 Boards! The Reliable "Notebook" Feature
You can save up to 30 of your notes and ideas in the app's "Notebook."

4. Share Your Ideas: Image Export Function
With a single tap, you can save your completed notes and diagrams as PNG images to your smartphone. Share meeting minutes with your team, or post a handwritten message on social media. The possibilities are endless.

5. Drawer for a Clear Overview
Manage all your saved notes at once from the convenient drawer view!

6. Take a Little Break: "Recess" Minigame
For the strategic thinker, we've included a "Blackboard Connect Four" to help you unwind!
With four difficulty levels from EASY to EXPERT, it's addictively fun. The rule is simple: "Be the first to get four in a row—vertically, horizontally, or diagonally!" so anyone can jump in and play. Perfect for a quick refresh between tasks.

How to Play -
You can start the game from "Recess" on the About (Info) page!

This "Blackboard Tetris" (as we called it) is a game I used to play with friends on the blackboard at school and cram school when I was a kid. 👌

◆ Recommended Uses ◆

For the Business Professional: Perfect for sketching ideas during meetings, brainstorming sessions, and creating to-do lists. The freedom of handwriting keeps your thoughts flowing.

For the Student: Use it for math equations, memorizing vocabulary, or as a substitute for lecture notes. The ease of writing and erasing boosts your learning efficiency.

For Everyday Memos: From today's shopping list and messages for your family to jotting down a phone number, it's perfect for all those "quick note" moments in daily life.

For a Child's Doodle Pad: A blackboard where you can draw freely with your finger is the ultimate canvas for nurturing a child's creativity. And you don't have to worry about messes with paper and crayons.

◆ To the Powered-Up "Kokuban Taisho" ◆
"Kokuban Taichi" was the first app I ever made. How many years ago was that? I recently decided to get back into app development and remade it with Jetpack Compose. 👍🙋
While keeping its snappy performance, I've pursued more stable drawing and a more user-friendly UI.
As a partner to make your everyday life more creative and convenient, please give the new "Kokuban Taisho" a try!