Tools
Filters: Sorted by date
Tool
Sorting algorithms
— Visualize and compare different sorting algorithms as they organize data in real time. Watch each algorithm's approach through animated bar charts, tracking comparisons and swaps while learning how bubble sort, selection sort, insertion sort, merge sort, quick sort, heap sort, and Timsort differ in performance. Run multiple algorithms simultaneously to see which performs best on your chosen dataset size and speed.
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SQLite Bytecode Explorer
— Explore SQLite's Virtual Database Engine (VDBE) by analyzing the bytecode that SQLite generates when compiling SQL queries. This tool runs the `EXPLAIN` command on your SQL statements and annotates each instruction with detailed explanations of what it does, from cursor management and table scans to index lookups and aggregate functions.
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MP3 Inspector
— Extract ID3 metadata and file information from MP3 audio files using this browser-based tool. Upload an MP3 file by dragging it onto the drop zone or selecting it through the file picker, and the inspector will parse and display all available tags including title, artist, album art, technical encoding details, and embedded URLs. The tool organizes metadata into categorized sections and provides a raw JSON view for advanced inspection of the complete tag data.
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NICAR 2026 Schedule
— Browse the NICAR 2026 conference schedule with powerful search and filtering capabilities. This interactive schedule viewer lets you explore sessions across multiple days, filter by session type, track, and skill level, and save your favorite sessions for quick access. The schedule works offline using cached data and automatically syncs updates when you're back online.
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GIF Optimizer (gifsicle WASM)
— Optimize animated GIF files using gifsicle compiled to WebAssembly, with all processing occurring directly in your browser without server uploads. The application offers preset optimization profiles ranging from lossless compression to aggressive lossy reduction, along with manual control over parameters like color palette size, scaling, and dithering methods.
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markdown-copy component
— The `<markdown-copy>` component renders markdown content with built-in controls for viewing the rendered output and copying or viewing the source code. It provides an interactive interface with a menu button that allows users to toggle between the formatted markdown display and the raw markdown source, as well as quickly copy the markdown text to the clipboard.
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Animated Word Cloud
— View animated word cloud visualizations that use an Archimedean spiral placement algorithm to position words on a canvas. Each word spirals outward from the center until it finds an unoccupied space, with grid-based spatial indexing accelerating collision detection to handle large datasets efficiently. Control the animation playback speed, step through frames manually, download the final result as a PNG, or paste your own text to generate a custom word cloud.
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Unicode Explorer — Binary Search Over HTTP
— View Unicode characters and their properties through an interactive binary search algorithm that makes real HTTP Range requests to fetch individual records from a binary database. Enter a character or Unicode codepoint to see each step of the search visualized in a network log, including fetch times and comparisons.
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Contact form
— Submit contact information through this responsive form that provides real-time validation using native HTML5 attributes and CSS-only feedback. The form validates required fields including name, email, and message content, displaying checkmarks for valid inputs and error messages for invalid entries without requiring any JavaScript.
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Gemini Prompt
— Generate responses from Google's Gemini API with support for system prompts, model selection, and streaming output. The interface stores your API key securely in local storage and maintains a history of system prompts for quick reuse. Markdown formatting is automatically rendered in the output area, and you can copy responses to your clipboard with a single click.
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Gradient image generator
— Generate customizable gradient images with multiple pattern overlays and effects. This tool provides controls for linear, radial, and conic gradients with adjustable colors, along with options for layering various patterns including noise, geometric shapes, and textures. Additional features include film grain, vignetting, and blend mode controls to fine-tune the visual appearance, with the ability to export the final result as a PNG image or save and restore settings as JSON.
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Python Comment Stripper
— Remove all comments from Python source code while preserving strings, docstrings, and code structure using the `tokenize` module running on Pyodide. Paste your Python code into the input panel, and the tool automatically strips comments in real-time, with the ability to copy the cleaned output to your clipboard. The application runs entirely in the browser without requiring a local Python installation.
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Pyodide REPL
— Execute Python code directly in your web browser using Pyodide, a port of CPython to WebAssembly. This REPL provides an interactive Python environment with support for multiple Pyodide versions, single-line and multi-line input modes, and command history navigation. The interface is optimized for both desktop and mobile devices, with a dark theme and responsive layout that prevents content from being hidden behind on-screen keyboards.
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GIF Dissector
— Parse and visualize animated GIF files by extracting individual frames, timing data, color palettes, and detailed metadata. Upload a GIF file to instantly decompose it into its constituent frames with precise delay measurements, disposal methods, transparency information, and global color table analysis. The tool renders composited frames to show exactly how the animation appears, while providing comprehensive technical details about the image structure and properties.
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SQLite AST
— Parse SQLite SELECT queries into abstract syntax trees and view the results in JSON and Python representations. This tool uses the sqlite-ast library running in your browser via Pyodide to analyze SQL syntax and display both the dictionary-based parse tree and a rich pretty-printed representation. It supports complex queries including compound selects, common table expressions, and window functions, and can display partial parse results when encountering syntax errors.
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Minesweeper
— Play a classic Minesweeper game directly in your browser with support for three difficulty levels: Easy, Medium, and Hard. Use left-click to reveal cells and right-click to place flags, or toggle between reveal and flag modes on mobile with long-press support. The game features a timer to track your speed, mine counter to monitor remaining flags, and immediate visual feedback when you win or hit a mine.
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Directory Explorer Demo
— Explore the contents of a local directory in your browser with an interactive file tree viewer and search functionality. This tool demonstrates the capabilities of the `webkitdirectory` input attribute to access folder structures and analyze file distribution. Once a directory is selected, view detailed statistics about file counts, total size, and file type breakdown, with options to filter by name and file extension.
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Bookmarklets Collection
— Access a collection of practical bookmarklets for web development and general browsing tasks. Each bookmarklet can be installed by dragging it to your bookmarks bar on desktop browsers or by copying the code for mobile Safari. The collection includes tools for revealing page anchor points and viewing page source code with formatting options, all presented with detailed documentation and source code inspection capabilities.
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Seamless Sandboxed Iframe Prototype
— Embed untrusted content safely within a webpage using a sandboxed iframe that automatically adjusts its height without allowing cross-origin access. The prototype uses `postMessage` to communicate height changes between the sandboxed iframe and parent page, enabling seamless content display while maintaining security restrictions. Various content examples demonstrate how the sandbox handles dynamic content, images, and attempts at malicious behavior.
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Lobsters Latest Comments Bookmarklet
— Browse Lobste.rs comment threads with an enhanced "Latest" tab that displays all comments in chronological order with newest first, making it easier to catch up on recent discussion activity. The bookmarklet adds reply-to links showing parent comment relationships and includes a "Copy Thread" feature to export the entire discussion as numbered plain text.
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v86 Linux Emulator
— Run Linux commands in your browser using x86 emulation powered by v86, a JavaScript/WebAssembly-based x86 emulator. This tool executes a minimal Buildroot Linux distribution directly in your browser, with typical boot times between 10-30 seconds depending on your device and connection speed. Enter commands in the input field to interact with the Linux shell and view output in the terminal window.
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Hyperviz
— Create real-time audio-reactive visualizations with eight distinct modes including plasma, particles, tunnel effects, kaleidoscope patterns, Matrix rain, terrain, fire, and starfield animations. The visualizer captures frequency data from your microphone and responds dynamically to bass, mid, and high frequencies, with beat detection triggering visual flashes and intensity changes.
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Software Heritage Repository Retriever
— Download archived Git repositories from Software Heritage, the universal archive of software source code. This tool queries the Software Heritage GraphQL API to locate repositories and creates downloadable bare Git archives through the vault service. Enter a repository URL to retrieve the latest snapshot and access detailed archive information including the Software Heritage identifier (SWHID) for future reference.
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PG&E Outage Map - Half Moon Bay Area
— Track power outages affecting the Half Moon Bay area with this interactive map displaying real-time PG&E outage data within a 15-mile radius. The application visualizes outage locations as point markers and affected areas as polygons, while displaying key statistics including the number of outages, impacted customers, and affected regions. Custom markers can be added by providing a URL parameter, and the map automatically refreshes every five minutes to ensure current outage information.
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MicroQuickJS Code Executor
— Execute JavaScript code in a lightweight MicroQuickJS sandbox environment running via WebAssembly, with results displayed directly on the page. The sandbox supports ES5-like JavaScript features and automatically saves your code in the URL for easy sharing and recovery. Choose between optimized and original WebAssembly versions, try built-in examples, and use Ctrl+Enter to quickly run your code.