Elsewhere
Release TIL Research Tool Museum Sighting
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Research
AST-Grep Import Rewriter
— Leveraging ast-grep and custom YAML rules, the AST-Grep Import Rewriter offers a structured approach to automatically extract, analyze, and rewrite obfuscated JavaScript import statements across ES6, CommonJS, dynamic imports, and webpack bundles. By parsing source files, it generates mapping templates and applies user-defined mappings, converting unreadable module paths into meaningful names with either regex- or AST-based transformations.
Research
Offline Notes Sync System
— Building on offline-first principles, this notes sync system enables robust note creation and editing without active internet connectivity, using IndexedDB and service workers on the client side. It employs operation-based sync and vector clocks for fine-grained conflict detection and resolution, and features a three-way character-level merge algorithm inspired by Apple Notes.
Tool
PyPI Package Changelog
— Track code changes across Python package versions by comparing distributions from PyPI. Enter any package name to view all released versions and generate side-by-side diffs of the changes between any two versions. The tool extracts and compares all text files from wheels or source distributions, intelligently handling binary files and package metadata renames while preserving the full context of modifications.
Research
Epsilon Python Wrapper
— Epsilon Python Wrapper provides seamless Python bindings to Epsilon, Google's pure Go WebAssembly 2.0 runtime, enabling efficient and dependency-free WASM execution within Python projects. The wrapper exposes a simple API for module instantiation, function calls (with type safety), memory operations, and export inspection, supporting advanced features like SIMD and resource limiting.
Research
Datasette-lite JavaScript Initialization: Problem Analysis & Solution Proposal
— Datasette-lite faces a core limitation: HTML content injected via `innerHTML` does not execute embedded JavaScript, breaking interactive features and plugin functionality. The proposed solution introduces a standardized initialization event (`datasette_init`) triggered after each content update, allowing dependent scripts and plugins to reinitialize reliably.
Research
Datasette Lite NPM Package Investigation
— Converting Datasette Lite into a self-hostable NPM package enables seamless client-side data exploration using SQLite, CSV, JSON, and Parquet files directly in the browser, powered by Pyodide. The project removes analytics, adds a CLI server for local testing, and exposes all necessary static assets for easy deployment to platforms like GitHub Pages, Netlify, or Vercel.
Research
SQLite Ripgrep Function
— SQLite Ripgrep Function enables fast code and text search inside SQLite queries by integrating the powerful ripgrep search tool as a custom SQL function. It offers both a pure Python implementation and a performant C extension, allowing users to search files within a configurable directory, restrict output with glob patterns (e.g., `*.py`), and enforce time limits to avoid runaway queries.
Tool
Bluesky Search
— Search Bluesky posts using advanced filters and options to organize results by latest or top engagement. This tool requires authentication with your Bluesky account credentials and supports filtering by date range, author, mentions, language, domain, URL, and hashtags. Results can be exported as formatted markdown for easy sharing and documentation.
Research
Apptron Analysis Report
— Apptron is a browser-based cloud IDE that hosts a full x86 Linux environment using emulation and WebAssembly, delivering a seamless developer experience directly in the browser. By tightly integrating VS Code, a Linux terminal, and persistent cloud storage via Cloudflare R2, users are able to work on customizable environments without any local setup.
Tool
Tacopy Playground - Tail-Call Optimization for Python
— Explore how tail-recursive Python functions are transformed into optimized iterative code using the Tacopy library. Enter your recursive function in the input panel to see the automatically generated transformed version, which eliminates stack overflow risks and improves performance by converting tail calls into loops. Try the built-in examples to understand how different recursive patterns are optimized.
TIL
Subtests in pytest 9.0.0+
— [pytest 9.0.0](https://pypi.org/project/pytest/9.0.0/) was released on November 8th 2025. I just got around to looking at the [release notes](https://docs.pytest.org/en/stable/changelog.html#pytest-9-0-0-2025-11-05) and the biggest new feature is **subtests**, previously available as the separate [pytest-subtests](https://pypi.org/project/pytest-subtests/) plugin.
TIL
Dependency groups and uv run
— I've adopted a new (to me) pattern for my Python projects to make them easier to hack on using `uv run`. I'm using a [PEP 735 dependency group](https://peps.python.org/pep-0735/) called `dev` to declare my development dependencies - in particular `pytest` - such that running `uv run pytest` executes the tests for my project without me having to even think about setting up a virtual environment first.
Tool
Notes to Markdown
— Convert Apple Notes content to Markdown and HTML formats while preserving hyperlinks and formatting. Paste your notes into the text area to automatically generate both Markdown and HTML outputs, with a live preview of the rendered content. The tool parses RTF data from Apple Notes and provides copy buttons for easy transfer of the converted content.
Tool
The Octave — A Sound Relationship
— Explore the mathematical and sonic relationship between frequencies through interactive demonstrations and a playable piano keyboard. This educational tool visualizes how an octave represents a 2:1 frequency ratio, allowing you to hear the harmonic connection between notes that sound identical yet exist at different pitches. Experiment with various base frequencies using the slider to understand how this fundamental musical principle scales across the entire spectrum.
My tools.simonwillison.net records personal analytics in localStorage - invisible to the site operator, but a user can use them to see which tools they visit the most often.
Research
GitHub CLI API Proxy Investigation
— Proxying GitHub CLI (`gh`) API traffic can be achieved through standard HTTP/HTTPS proxies or via a Unix domain socket, each suited to different use cases and levels of flexibility. The CLI, implemented in Go, natively supports proxy environment variables (`HTTPS_PROXY`, `HTTP_PROXY`, `NO_PROXY`), making integration with existing HTTP proxies seamless and requiring no changes to the CLI configuration.
Research
Self-Hosting Datasette Lite: Research Report
— Datasette Lite, a browser-based SQLite explorer powered by Pyodide and WebAssembly, can be fully self-hosted and used offline by bundling all core files, required Python wheels, and optional sample databases locally instead of relying on external CDNs and PyPI hosts.
Tool
The New Yorker Style Converter
— Convert text to match The New Yorker's distinctive typographic style, featuring proper diaereses (such as "coöperate" and "naïve"), curly quotation marks, em dashes, and ellipses. Paste your text into the input field and watch the refined version appear instantly in the output area, which can be copied to your clipboard with a single click.
Research
Datasette 1.0a20 SQL Permissions System: Architecture Review
— A comprehensive architecture review of Datasette's new SQL-based permissions system (introduced in v1.0a20) finds that transitioning from a callback-driven model to SQL query resolution greatly improves scalability for large deployments. The redesigned system efficiently checks access by evaluating compiled permission rules through internal catalog tables, substantially reducing processing overhead compared to the multiplicative N x M callback pattern.
Tool
Bluesky Quote Finder
— Search for quote posts on Bluesky by entering a post URL to discover all responses that quote the original post. The tool fetches and displays these quotes with options to sort by likes, recency, or oldest first, and provides direct links to view each quote on Bluesky or explore its thread context. A color-coded depth indicator helps visualize the conversation hierarchy.
Tool
Link Extractor
— Extract hyperlinks from pasted web content and export them in multiple formats including HTML, Markdown, and plain text. The tool automatically detects and removes duplicate links while displaying each link's title and URL for easy verification. Copy extracted links in your preferred format with a single click.
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