Simon Willison's Tools

Working

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

1.9k GitHub starsPushed 1 day agoRuns in the browser4 checksDeveloper utilities GitHub Pages

Open Simon Willison's Tools SourceChecked 3 days ago

What stands out

Taken from the page and the access facts we recorded. Nothing here is guessed.

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
find a quick HTML or JavaScript utility for a one-off job
No account required
Has a free tier
Uses your own API key
Source is public
Built with Claude Code

What we checked

A missing tick means we have not measured it. A red mark is a check that failed.

App accessible
The last check reached a working page.

Looked: 0
Opened: 1
Checks: 4
Watching: 0

Looked and opened count distinct browsers on this site, not verified people. Checks are requests we made. None of these come from the app itself.

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

Development

2 snapshots kept

Active

Commits landed in the last 90 days.

Evidence

Each bar is one request we made

Checks: 4
Working: 100%
Median response: 1230ms
Watching since: 6 days ago

Browser render check

Checked 11 hours ago in a real browser

4 of 5 pages rendered

/rendered26ms
/blender-viewerrendered1708ms
/colophonrendered493ms
/gemini-livesignup wall780ms
/python/rendered819ms

Pages loaded in a real browser, not just an HTTP request. Route discovery is best-effort — nav links not in the initial DOM are not followed. How we check

Activity

Watching since 6 days ago

Last content change: 3 days ago
Unchanged for: 3 days
Certificate expires: in 41 days

How it looked

6 days ago
11 hours ago

The page content changed3 days ago
Its embedding policy changed6 days ago

We hash the visible text on every check, so a redesign registers and a rotating advert does not. An app that has not changed in a long time is not necessarily abandoned — but it is a fact worth knowing before you depend on it.

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.

What people say

No reviews yet.

We would rather show none than invent them.

Embed this status

Put it in your README. It updates itself every time we check, and links to your verification record — evidence a stranger can read, not a page selling them something.

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

Others like this

Each of these answered on its most recent check.