Simon Willison's Weblog: Beats

llm-openrouter 0.6

2026-04-20T18:00:26+00:00

llm-openrouter 0.6

LLM plugin for models hosted by OpenRouter

SQL functions in Google Sheets to fetch data from Datasette

2026-04-20T02:33:58+00:00

SQL functions in Google Sheets to fetch data from Datasette

I've been experimenting with ways to fetch data from Datasette and display it in Google Sheets.

Claude system prompts as a git timeline

2026-04-18T12:25:00+00:00

Claude system prompts as a git timeline

Anthropic's published system prompt history for Claude is transformed into a git-based exploration tool, breaking up the monolithic markdown source into granular files and timestamped commits. By structuring extracted prompts per model, family, and revision, researchers can leverage `git log`, `diff`, and `blame` to trace prompt evolution, compare differences, and attribute changes to specific dates—all without manual parsing.

datasette-public 0.4a1

2026-04-17T04:30:22+00:00

datasette-public 0.4a1

Make selected Datasette databases and tables visible to the public

datasette 1.0a28

2026-04-17T04:01:56+00:00

datasette 1.0a28

An open source multi-tool for exploring and publishing data

llm-anthropic 0.25

2026-04-16T20:37:12+00:00

llm-anthropic 0.25

LLM access to models by Anthropic, including the Claude series

datasette.io news preview

2026-04-16T00:18:03+00:00

datasette.io news preview

Preview and validate datasette.io news entries in YAML format with real-time rendering and markdown linting. The editor loads the current news.yaml file from GitHub and provides immediate feedback on formatting errors, link validation, and markdown syntax issues while displaying a styled preview of how entries will appear on the live site. Use the error badge to track validation issues and fix them directly in the editor pane.

datasette-export-database 0.3a1

2026-04-15T23:52:35+00:00

datasette-export-database 0.3a1

Export a copy of a mutable SQLite database on demand

datasette 1.0a27

2026-04-15T23:16:34+00:00

datasette 1.0a27

An open source multi-tool for exploring and publishing data

Gemini 3.1 Flash TTS

2026-04-15T16:41:46+00:00

Gemini 3.1 Flash TTS

Convert text to natural-sounding speech using Google's Gemini 3.1 Flash TTS model with support for both single-speaker and multi-speaker conversation modes. The tool allows you to customize voice selection, apply directorial tags like `[whisper]` and `[short pause]` for dynamic delivery, and download the generated audio as a WAV file. Requires a valid Gemini API key to function.

datasette-ports 0.3

2026-04-15T02:50:57+00:00

datasette-ports 0.3

Find all currently running Datasette instances and list their ports

Exploring the new `servo` crate

2026-04-13T15:19:00+00:00

Exploring the new `servo` crate

After the April 2026 release of the `servo` v0.1.0 crate (blog post), a concise investigation shows that Servo is now an embeddable browser engine for Rust, with a clear API centered on the `ServoBuilder`, `WebView`, and pixel readback methods. A headless CLI (`servo-shot`) successfully renders URLs or HTML files to PNG, building against stable Rust with a robust software-based rendering pipeline.

QuickJS Python Sandbox — Investigation Report

2026-04-12T23:16:00+00:00

QuickJS Python Sandbox — Investigation Report

Exploring the `quickjs` Python package, this project implements an asyncio-compatible JavaScript sandbox with robust resource controls and seamless exposure of both synchronous and asynchronous Python functions (including async httpx fetches) to JavaScript code.

SQLite Query Result Formatter Demo

2026-04-11T19:35:31+00:00

SQLite Query Result Formatter Demo

Format SQLite query results in 20 different styles including box-drawing tables, CSV, JSON, HTML, Markdown, and more using this interactive WebAssembly-based demonstration. Adjust formatting options like column headers, screen width, NULL display values, and border styles in real-time to see how your SQL queries render across all available output modes. The demo database includes sample tables for employees, products, and orders with pre-built example queries showcasing each formatting style.

GitHub Repo Size

2026-04-09T21:31:50+00:00

GitHub Repo Size

Check the size of any GitHub repository by entering the owner and repository name or pasting a GitHub URL. The tool fetches repository data from the GitHub API and displays the total size in kilobytes, megabytes, or gigabytes depending on the repository's scale. Results are automatically saved to the browser URL, allowing you to share or revisit repository size checks.