tools

tools.simonwillison.net

Miscellaneous HTML+JavaScript tools built mostly with the help of LLMs.

This collection is an experiment in prompt-driven development with very low stakes.

The colophon lists commit messages and transcripts for every tool.

The code lives in simonw/tools and many tools used the Claude custom instructions described here.

Image and media

Text and document

Data and time utilities

GitHub and development

Bluesky and social tools

LLM playgrounds and debuggers

Miscellaneous

On Observable

On Observable: