Python Tutor

Spec sheet

Purpose

Python Tutor lets users write code in a web browser and see a step-by-step visualization as it runs.Read 9 Oct 2026 · pythontutor.com

Intended users

The site describes uses for students debugging coursework, teachers explaining concepts, and programmers preparing for interviews.Read 9 Oct 2026 · pythontutor.com

Free plan

YesRead 20 Sep 2026 · pythontutor.com

Support

The homepage links to a bug-report form and documentation on unsupported features.Read 9 Oct 2026 · pythontutor.com

Founded

2010Read 28 Sep 2026 · pythontutor.com

Creator

The site says Python Tutor was created by Philip Guo in 2010.Read 9 Oct 2026 · pythontutor.com

Embedding

The site documents embedding a visualization in another webpage using an iframe.Read 9 Oct 2026 · pythontutor.com

Execution limits

The documented execution sandbox has no file or network access and limits runs to 1,000 steps for Python, Java, and JavaScript and about 300 for C and C++.Read 9 Oct 2026 · pythontutor.com

Languages

The site supports Python, Java, C, C++, and JavaScript.Read 9 Oct 2026 · pythontutor.com

Other limits

The site guide says it does not support multi-file projects, package installation beyond the Python whitelist, or JavaScript event-loop and asynchronous visualization.Read 9 Oct 2026 · pythontutor.com

Python limits

Python execution is limited to a whitelist of common standard-library modules.Read 9 Oct 2026 · pythontutor.com

Teacher access

Teachers and student teaching assistants can apply for free ad-free mode with added teacher features, subject to manual eligibility verification.Read 9 Oct 2026 · docs.google.com

Visualizations

It visualizes variables, objects, pointers, data structures, and stack frames.Read 9 Oct 2026 · pythontutor.com

Plans and prices

Every Python Tutor plan and price →

Where Specifiction places it

• Coding Playgrounds#99 of 1387.5
• Code Playground Software#43 of 587.3