Web
- C Playground Guide
A small C program can reveal a lot about pointers and memory once you see what it prints. C Playground keeps compiler diagnostics and program output together, without a local toolchain.
- C++ Playground Guide
Containers and classes are easier to reason about in a short program than in a full project. The examples below run in C++ Playground, which compiles C++20 and displays diagnostics alongside the output.
- Python Playground Guide
Python’s list comprehensions and ranges are easier to check with a few values than with a large dataset. Python Playground runs the examples below in the browser and shows their printed output.
- Ruby Playground Guide
Ruby’s puts, print and inspect produce different views of the same value. Ruby Playground shows those differences in the output of small programs, including the array and class examples below.
- TypeScript Playground Guide
Type annotations describe code, but they do not survive into the JavaScript that runs. TypeScript Playground makes that distinction visible with small typed examples and their runtime output. An interface disappears at …
- API Testing
An API request has a few moving parts: a method, a URL, headers, and sometimes a body. When a test fails, change one of those at a time. Otherwise a different status code will not tell you which change mattered.
- Background Remover Guide
Background Remover makes the background of a picture transparent by flooding inward from pixels along the edge and clearing anything close enough in colour. It suits a product shot on a plain surface or a screenshot on a …
- Browser Debugging Utilities
The browser shows you two different kinds of failure: what happened on the network and what your JavaScript did with the response. Keeping those separate saves a lot of guessing.
- Browser Games and Practice Tools
Small games and practice tools are useful when the feedback is immediate: you make a move, see the result, and try again. You do not need an account or a complicated setup to get started.
- Camera Recorder Guide
Camera Recorder records a video with audio from your device using browser media APIs. The clip is held in the tab until you download it; the tool does not upload the recording.