PythonMastery
PythonMastery is a free browser-based Python workspace and learning site running Python 3.13 through Pyodide and WebAssembly.
What PythonMastery is
PythonMastery is a free browser-based Python workspace and learning site running Python 3.13 through Pyodide and WebAssembly. Its editor requires no installation or account and includes live syntax checking, find and replace, code folding, importable tabs, autosaved history, and a Stop button. NumPy, pandas, Matplotlib, and scikit-learn are built in; the site also says XGBoost, LightGBM, and statsmodels run in the browser. A notebook lets cells share a Python session, displays tables and plots inline, and imports or exports .ipynb files. Python Academy offers learning paths in fundamentals, data science, machine learning, AI, and deep learning, while Tutorial Lab provides quizzes, quick tests, and exercises in those areas. Users can share code by URL or embed runnable examples in webpages and GitHub READMEs. The privacy policy says code, output, and uploaded datasets are not collected or stored. Uploaded files and editor preferences remain in the browser until removed or site data is cleared. The responsive editor and lessons work on phones and tablets.
Good
- Runs Python 3.13 in the browser without installation.
- No account registration or login is required.
- Notebook imports and exports .ipynb files.
- Includes NumPy, pandas, Matplotlib, and scikit-learn.
- Editor and lessons work on phones and tablets.
Watch out
- PyTorch and TensorFlow cannot run in its browser environment.
- Uploaded files remain in browser storage until removed or site data is cleared.
- The privacy policy names several third-party services.
Who it suits
PythonMastery suits people who want to write or learn Python in a browser without setting up an account or installation. Its notebook, data science libraries, learning paths, and exercises also suit learners exploring those topics.
Verdict
PythonMastery brings a browser editor, notebook, learning materials, and practice exercises together at no charge. Its stated limits include unavailable PyTorch and TensorFlow support and browser-based storage for uploaded files and preferences.
Plans and prices
From PythonMastery's own pricing page, checked 8 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | No paid plans · No feature paywalls · No account required |
The facts
Each one read from PythonMastery's own pages, with the date it was checked.
What it does
- Analytics and third parties
- The privacy policy names Google Analytics, Google Fonts, FormSubmit, ipapi.co, Open-Meteo, jsDelivr, and the Tailwind CDN, and describes when analytics runs and how to disable it.checked 8 Oct 2026
- Data science libraries
- NumPy, pandas, Matplotlib, and scikit-learn are built in, and the site says XGBoost, LightGBM, and statsmodels also run in the browser.checked 8 Oct 2026
- Data storage
- Uploaded files and editor preferences are stored in the user’s browser, and the privacy policy says uploaded files remain there until removed or browser site data is cleared.checked 8 Oct 2026
- Editor features
- The editor includes live syntax checking, find and replace, code folding, tabs that can import each other, autosaved history, and a Stop button.checked 8 Oct 2026
- Learning content
- Python Academy offers learning paths covering Python fundamentals, data science, machine learning, AI, and deep learning.checked 8 Oct 2026
- Notable library limits
- The site says PyTorch and TensorFlow cannot run in its browser environment because neither has a WebAssembly build.checked 8 Oct 2026
- Notebook
- The browser notebook has cells that share a Python session, renders tables and plots inline, and supports importing and exporting .ipynb files.checked 8 Oct 2026
- Practice
- Tutorial Lab provides quizzes, quick tests, and exercises across Python, data science, machine learning, and AI.checked 8 Oct 2026
- Privacy
- The privacy policy says code, execution output, and uploaded datasets are not collected or stored, and that there is no account registration or login.checked 8 Oct 2026
- Sharing and embeds
- Users can share code by URL and embed runnable examples in a webpage or GitHub README; the site says embedded code runs in the reader’s browser.checked 8 Oct 2026
- Support
- The site provides a feedback form that it says is read by one person, with optional name and email fields and no autoresponder or mailing list.checked 8 Oct 2026
Where it runs
- Browser IDE
- PythonMastery runs Python 3.13 in the browser using Pyodide and WebAssembly, with no installation or account required.checked 8 Oct 2026
- Supported devices
- The site says its responsive editor and lessons work on phones and tablets, including portrait and landscape orientations.checked 8 Oct 2026
The company
- Maker details
- The site refers to its founder but does not identify the founder’s name, headquarters, or founding date on the opened pages.checked 8 Oct 2026
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