Welcome to Codetoy 👋

Codetoy is a zero-boilerplate coding playground for learning, experimenting, and creating fun interactive experiences directly in your browser.

There’s nothing to install, no project setup, and no engine overhead — just code, a canvas, and instant visual feedback.

At its core, Codetoy is built around CanvasRenderingContext2D, so if you’ve ever drawn something on an HTML canvas, you already understand the fundamentals. Everything you write ultimately maps to 2D drawing concepts like shapes, paths, colors, transforms, and text.

Codetoy exists to be:

• A thinking tool for ideas
• A learning tool for programming and math
• A prototyping tool for mechanics and visuals
• A sharing tool for runnable code snippets and experiments

All languages target the same canvas runtime and API.

Typed · WebAssembly · Fast

AssemblyScript is a strictly typed subset of TypeScript that compiles to WebAssembly.

• Familiar syntax for web developers
• Predictable performance
• Operator overloading
• Ideal for graphics, math, and experimentation

AssemblyScript Docs →

.NET 10 · C# 14 · Unity-friendly

The C# playground runs modern .NET directly in the browser.

• Full C# 14 language features
• Familiar to Unity and .NET developers
• Excellent for math-heavy or game-style logic

C# Docs →

Simple · Lightweight · Game-proven

Lua is a popular scripting language used in many games.

• Easy to learn
• Fast iteration
• Great for experimentation and scripting

Lua Docs →

Here’s a quick guide based on your background 👇

If you’re completely new to coding, Codetoy will make more sense after learning the basics.

We strongly recommend starting with:

• Khan Academy – Computer Science
  https://www.khanacademy.org/cs

Once you understand variables, loops, and functions, Codetoy is a great place to experiment.

If you come from JavaScript or TypeScript:

• AssemblyScript typed subset of TypeScript that compiles to WebAssembly
• Better suited to game development with features like operator overloading and value types
• The best recommended choice for Codetoy projects
• Full LSP and Intellisense support!

AssemblyScript Docs →

If you’re familiar with Roblox or Luau:

• Lua 5.4 is provided out of the box
• Luau support is underway (Join the discord to get notified when this drops)
• Luau intellisense and LSP support is also underway

Lua Docs →

If you use Unity and C# some concepts still apply:

• Update() ≈ Screen.OnUpdate()
• Time.deltaTime ≈ Screen.DeltaTime
• Input.GetMouseDown() ≈ Input.IsMouseDown(int button)
• LSP support for .NET 10 and C# 14 is underway (Join the discord to get notified when this drops)

C# Docs →

Codetoy uses a 2D canvas coordinate system:

• Origin (0, 0) is top-left
• X increases to the right
• Y increases downward (like Unity UI)

1. Pick a language that feels familiar
2. Skim the docs for that environment
3. Draw something simple
4. Experiment freely

Codetoy is all about curiosity and experimentation first.

Want to learn more?

Join the discord and chat with the community

Join the Discord