Tutorialllmsingle file htmlcdnpyodide
Developer Builds Over 150 HTML Tools With LLMs
7.0
On 10 December 2025, Simon Willison reports he built over 150 single-file "HTML tools" in the past year, almost all authored by large language models. He outlines practical patterns—single-file HTML, avoiding React, loading dependencies from CDNs, self-hosting, copy/paste UX, coding agents, Pyodide and WebAssembly—that streamline prototyping and distribution. These practices make small web utilities easy to generate, share, and maintain.
Key Points
- 1Builds over 150 single-file HTML tools, primarily generated by LLMs, enabling rapid prototyping.
- 2Avoids React and build steps to ease copying, hosting, and quick edits across platforms.
- 3Encourages CDN dependencies, self-hosting, and URL/localStorage persistence for practical developer workflows.
Scoring Rationale
Practical, widely applicable developer patterns with clear examples, limited by being a single-author experiential account.
Sources
Public references used for this report.
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