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A complete workspace for every step of your coding journey
Solve hands-on programming problems in Python, C++, or C# right in your browser. Get instant test results and an AI code review, then compare your approach with the community.
Write solutions in Python, C++, or C# with the same editor and workspace you use to run code.
Submit and see results for every test right away, with expected and actual output for each failure.
Every passing solution gets an AI rating on correctness, readability, efficiency, and language practices.
Read other developers' solutions and AI reviews, then join the discussion once you've solved the challenge.
Popular challenges to start with
Move from a quick snippet to a multi-file project without changing tools. CodeUtility combines flexible runtimes, a capable editor, persistent files, and built-in assistance.
Use an isolated execution server with full workspace access, or run supported languages locally in a browser worker. Stop long runs and switch modes when needed.
Ask the AI assistant to explain the active program, clarify unfamiliar logic, and revisit recent explanations and assisted results from the editor.
Set breakpoints and step through supported browser runtimes, then use Fix Code to identify problems and apply a suggested repair without leaving the editor.
Work with syntax highlighting, multiple tabs, search and replace, formatting, configurable themes and fonts, plus focused Minimal and full Advanced layouts.
Create files and folders, upload or download assets, and let programs interact with workspace files. Signed-in users can keep projects available across sessions.
Share a file, directory, or complete workspace as a snapshot or live project, with access controls, saved activity, chat, and collaborative editing.
Inspect what is already preinstalled, then add private packages for your account and selected runtime. Cached downloads make repeated setup faster.
Revisit revisions of the active file and move through saved run outputs. Compare earlier work and copy a previous result without running the program again.
Enter standard input while a program runs, watch output as it arrives, copy results, and stop long-running jobs directly from the executor.
Browser execution and debugging depend on the language and runtime. Persistent workspaces and some assisted features require sign-in, and usage limits apply.