Toolliyo Playground

Try it. Tool it. Prove it.

Scratchpads for C#, JavaScript, TypeScript, and SQL — plus a curated toolbench. When the idea sticks, jump into coding problems or company DSA. Compilers alone are not the product; the loop is.

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1 Try Run a snippet
2 Tool Format, mock, regex
3 Prove Coding / company sheets

Language scratchpad

Free run — no login. Rate-limited. Switch language to load a starter snippet.

Source

using System;

class Program {
    static void Main() {
        Console.WriteLine("Hello from Toolliyo Playground");
        int[] nums = { 1, 2, 3, 5, 8 };
        int sum = 0;
        foreach (int n in nums) sum += n;
        Console.WriteLine("Sum = " + sum);
    }
}

stdin (optional)

Output

Press Run to execute.

After you try this stack

.NET tutorials C# coding track Company DSA

Toolbench

Utilities that pair with the scratchpad — format, test, mock, then come back to run.

Browse all tools

JSON Formatter Pretty-print API payloads before you paste them into code. Regex Tester Validate patterns with live match highlights. SQL Formatter Beautify queries, then run them in the SQL scratchpad. Code Diff Compare snippets side by side before you submit. Mock Data Generate CSV / JSON / SQL rows for local experiments. HTML Formatter Clean markup when you are prototyping UI snippets.

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Try it. Tool it. Prove it.

Language scratchpad

Toolbench

Ready to prove it under constraints?