Useful Tools
50+ free online tools, ready to use
Graphic Design
Create social media graphics online with custom backgrounds, typography and one-click export
XHS Cover Cutter
Grid slicer for viral covers (3/4/9-grid) with gap preview, numbering and headline bleed-through
Background Designer
Background generator for social media with common sizes and cool Mesh / low-poly themes
Video Composer
Camera background + screen overlay, real-time compositing with recording
JSON Formatter
Format and validate JSON data with custom indentation
Code Screenshot
Carbon-style code screenshot tool with macOS window and cool shadows
Python Code Demo
Run Python code online with colorful demo effects
Encoding Converter
Convert between text encoding formats
Voice Recorder
Record, play and download audio online
Screen Recorder
Record your screen and camera online
Screenshot
Full-screen or region capture with one-click save
Typing Practice
Practice typing online to improve speed and accuracy
PNG to ICO
Convert PNG to ICO online, multiple sizes
Doc to Markdown
Turn Word, PDF, PPT, Excel, EPUB and more into clean Markdown — processed locally, never uploaded
Multiplication Table
Fruit-visualized multiplication table — click to see fruit counts
Math Practice
Online math practice to sharpen calculation skills
Secret Code
Shape-reasoning math puzzle — each shape hides a number
Daily Math
25 daily mental-math questions with timed grading and PDF print — free and ad-free
Fun Clock
Interactive game that teaches kids to read the clock
Cylinder Slice
Slice a cylinder into sectors, reassemble into a cuboid and derive V = πr²h
Letter Blast
Click animals to pop them for points — a fun alphabet game
The Way Home
Low-poly 3D path puzzle — lay roads to guide the character home around trees
Draw the Way Home
Draw a path to guide the character home around trees — 2D cartoon style
Number Match
Math pairing game for grades 1-3 with voice + visual hints, 24 levels and star ratings
3D Ray Maze
First-person 3D maze shooter — blast the correct answer to learn arithmetic
Word Dictation
English word dictation for kids with preset and custom word lists
Chinese Learning
Chinese learning for kids with pinyin grids, character practice and coin rewards
Background Tool
Cool background switcher with multiple themes
Keyboard Listener
Show live keystrokes with a key history
Physics Lab
Interactive physics experiments: cannon, circuits, springs, refraction and collisions
Special Effects
Curated visual effects: fireworks, matrix rain and more
Gesture Board
Real-time gesture drawing board with camera hand tracking
Arithmetic Cards
Printable double-sided cards for addition/subtraction within 20 with visual breakdowns — A4 ready
Word Obstacle Runner
Speech-recognition runner — say the words to pass obstacles
24 Game
A polished card-based 24-point puzzle with macaron colors to train mental math
Island Chase
4-player sailboat race — answer subtraction to sprint to the island, AI rivals included
Sailboat Subtraction
8 sailboats race — answer subtraction to advance and beat 7 AI rivals
Charlotte Valley
Sunflower garden path puzzle with spike traps, rotating bridges, ladders and key locks — 12 levels
Dimension Cube
3D particle cube math levels with supernova effects and combo bullet-time
Giraffe Pull
Read the clock correctly to race the giraffe to the finish line against the computer
Bubble Bliss
Blow colorful bubbles, merge same colors into rainbows and unlock a 10s soothing fairy tale with ASMR
Roboban
Classic sokoban puzzle — push packages to delivery points, 25 levels
AI Interface Builder
Describe a UI in plain language to generate a JSON spec and render it live, or paste a json-render spec directly
Mid-Autumn Blessings
10 curated emoji Mid-Autumn wishes with one-click copy, plus a random blessing mixer