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Simon Willison's Tools

Working

Small tools, each published with the AI transcript that built it

What it's for

  • grab a tiny single-purpose tool instead of writing one
  • read the prompt and transcript behind a tool before trusting it
  • see what prompt-driven development produces in practice
Show 1 more
  • find a quick HTML or JavaScript utility for a one-off job
1.9k GitHub starsPushed Runs in the browser159 checksDeveloper utilitiesGitHub Pages
Open Simon Willison's ToolsSourceChecked tools.simonwillison.netLast change recorded

We have checked Simon Willison's Tools 159 times since 11 Sept 2026, and it answered every time. Its visible text last changed on 25 Oct 2026.

What it does

A growing collection of single-purpose browser tools — text extraction, image conversion, API playgrounds, encoding utilities. What makes it unusual as a listing here is the colophon: the author publishes which model built each tool and the prompts used, so the AI attribution is stated rather than inferred. Several of the tools ask for your own API key rather than proxying through a server.

More in Developer utilities

Each answered its most recent check.

Looking for something else?

What stands out

  • No account required
  • Has a free tier
  • Uses your own API key
  • Source is public
  • Built with Claude Code

What we checked

  • App accessible

    The last check reached a working page.

  • Page rendered

    The last browser pass found a page that rendered.

  • Screenshot kept

    We captured a picture of the page.

  • Looked at

    Nobody has looked at this listing yet.

Looked
9

9 browsers

Opened
44

44 browsers

Checks
159

159 checks

Watching
0

Nobody yet

Browsers on this site, not verified people.

Screenshot of Simon Willison's Tools
Screenshot from our last capture

Development

7 snapshots kept

Active

Commits landed in the last 90 days.

+28 stars since we started watching.

Evidence

Each bar is one request we made
Checks
159
Working · last 40
100%
Median response
99ms
Watching since
11 Sept 2026

Of the last 40 checks, 40 answered (100%); the latest was on . Median response 99 ms. Watching since .

Browser render check

Checked 1 month ago in a real browser

4 of 5 pages rendered

  • /rendered146ms
  • /blender-viewerrendered1144ms
  • /colophonrendered573ms
  • /gemini-livesignup wall582ms
  • /python/rendered463ms

How the browser check works

Activity

Watching since
Last content change
7 days ago
Unchanged for
7 days
Certificate expires
in 55 days

How it looked

  1. 1 month ago

  2. 1 month ago

  • The page content changed7 days ago
  • The page content changed9 days ago
  • The page content changed15 days ago
  • The page content changed17 days ago
  • The page content changed18 days ago
  • The page content changed18 days ago
  • The page content changed19 days ago
  • The page content changed23 days ago
  • The page content changed25 days ago
  • The page content changed26 days ago
  • The page content changed26 days ago
  • The page content changed1 month ago
  • The TLS certificate was renewed1 month ago
  • The page content changed1 month ago
  • The page content changed1 month ago
  • The page content changed1 month ago
  • The page content changed1 month ago
  • The page content changed1 month ago
  • Its embedding policy changed1 month ago

How we track changes

What people say

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Simon Willison's Tools — still works
[![Simon Willison's Tools — still works](https://itstillworks.app/api/badge/simon-willison-tools)](https://itstillworks.app/verify/simon-willison-tools)