Tools
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Tool
XML Well-Formedness Validator
— Check XML documents for well-formedness by pasting content into the input area and clicking the validate button. The tool parses the XML and displays any syntax errors with precise line and column information, highlighting the problematic line in the code view below.
Tool
Emoji Identifier
— Extract and identify all emojis from text by pasting or typing into the input field, and instantly view their names and Unicode codepoint values. The tool uses a comprehensive emoji detection regex pattern combined with a Unicode emoji dataset to recognize a wide variety of emoji characters, including skin tone variants and zero-width joiner sequences. Results are displayed in real-time, showing each unique emoji found along with its standardized name and corresponding Unicode representation.
Tool
Badge Interactive REPL
— Interact with a MicroPython device via the Web Serial API to execute Python commands in real-time through a browser-based REPL interface. This tool enables direct communication with compatible microcontroller boards, allowing users to run Python code, query system information, and manage files without requiring terminal software or drivers. The interface provides quick-access buttons for common operations like listing files, checking CPU frequency, and monitoring available memory.
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GitHub GraphQL Explorer
— Explore GitHub's GraphQL API using an interactive query interface that requires authentication via a personal access token. Enter your GitHub token to connect and start writing, executing, and testing GraphQL queries against GitHub's data in real-time. The explorer provides syntax highlighting, query validation, and response inspection capabilities within an embedded GraphiQL environment.
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GitHub Rate Limit Checker
— Monitor your GitHub API usage and remaining rate limits with this authentication-based checker. After authenticating with your GitHub account, the tool displays detailed information about your API quotas across different resource types, including remaining calls, reset times, and visual progress indicators. The interface shows critical warnings when your limits are running low, helping you manage your API consumption effectively.
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Terminal to HTML
— Convert terminal output into shareable HTML documents with support for colored text formatting. Paste terminal output in RTF, HTML, or plain text format, and the tool instantly generates clean HTML code ready for preview or export. Save your conversions as GitHub Gists for easy sharing and collaboration.
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Query String Stripper
— Remove query parameters and tracking data from URLs with this Query String Stripper tool. Paste any URL to instantly extract the base address by stripping away everything after the question mark, then copy the cleaned result to your clipboard with a single click. This utility is helpful for sharing clean URLs, removing analytics parameters, or simplifying web addresses for documentation purposes.
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OpenAI Prompt Caching Playground
— Explore OpenAI's prompt caching feature by testing different prompt structures and observing cache hit rates across multiple requests. This interactive playground lets you compose system instructions, document context, and user questions, then send them to the Chat Completions or Responses API to track how cached tokens reduce costs and improve performance.
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Text Indentation Tool
— Adjust indentation levels in your text with this tool that offers multiple formatting options. Add or remove spaces from the beginning of each line, strip all leading whitespace, eliminate trailing spaces, and apply or remove quote markers (>) for formatted text. Copy the processed result directly to your clipboard with a single click.
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DOT File Renderer
— Render DOT graph files into visual diagrams directly in your browser. Paste your DOT syntax into the textarea and the graph will automatically render as an SVG visualization, with live updates as you edit. Share your graphs by copying the URL, which encodes your DOT content in the fragment identifier.
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JSON String Extractor
— Extract all strings from JSON data that exceed 20 characters in length or contain line breaks. This tool is useful for identifying longer text content within complex JSON structures for review, localization, or documentation purposes. Simply paste JSON into the textarea to automatically display matching strings along with their object paths, and use the copy button to quickly transfer any string to your clipboard.
Tool
Keyboard Debugger
— Monitor keyboard input in real-time with this interactive keyboard debugger that displays pressed keys and their corresponding key codes. Press any keys on your keyboard to see them appear with visual feedback, including support for simultaneous multi-key presses and special key representations. This tool is useful for testing keyboard functionality, debugging input handling, and understanding key event properties like key name, code, and keyCode values.
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MicroPython Code Executor
— Execute Python code in a sandboxed MicroPython WebAssembly environment with output displayed in real-time. Code is automatically saved to the URL for convenient sharing and persistence, and the environment supports JavaScript interoperability including the `fetch()` API for making HTTP requests. Built-in examples demonstrate common programming patterns from basic operations to working with APIs.
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NumPy Vectors & Matrices — Pyodide Lab
— Execute NumPy vector and matrix operations directly in your browser using an interactive lab powered by Pyodide. Work through five hands-on exercises covering elementwise operations, dot products, matrix multiplication, broadcasting, and indexing, then experiment freely in the playground sandbox with instant Python output.
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GitHub account lookup
— Look up GitHub user profiles and account information by username or numeric account ID. This tool fetches account details from the GitHub REST API, displaying information such as the user's name, login handle, account ID, creation date, profile avatar, and API response latency. The application stores rate limit information locally to prevent repeated requests during API throttling periods.
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AI Adoption Rolling Avg — Pyodide
— View AI adoption trends across different firm sizes by analyzing survey data on artificial intelligence usage in the workplace. This page runs a Python analysis using Pyodide to fetch employment survey data, calculate six-survey rolling averages, and generate an interactive visualization showing adoption rates by company size from November 2023 through August 2025. Download the resulting chart as PNG or SVG for further use or presentation.
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Pyodide Bar Chart Demo (pandas + matplotlib)
— Execute Python code directly in your browser with Pyodide, a WebAssembly-based Python runtime. This demo loads pandas, numpy, and matplotlib in the client to generate a bar chart from sample data and display it as a rendered image—no server required. The first run may take a few seconds as the necessary libraries are downloaded from CDN, but subsequent executions run instantly from your browser's cache.
Tool
Devon Lane Driving Simulator
— Navigate the treacherous single-track lanes of rural Devon in this interactive driving simulator, where you must manage your sanity while encountering cyclists, tractors, caravans, and other obstacles. Each encounter presents a unique challenge requiring a dice roll to succeed, with your choices affecting both your progress and mental state as you attempt to travel increasingly longer distances.
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Rich text to markdown
— Convert rich text formats into properly formatted Markdown by pasting content into the text area. The tool automatically detects and converts formatting such as bold, italic, links, code blocks, headings, tables, and lists while sanitizing content to remove potentially unsafe elements. Supports rich text from multiple sources including RTF, HTML, and plain text formats.
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Hacker News comments for a user
— View Hacker News comments for any user by entering their handle to retrieve up to 1,000 of their most recent comments. The tool displays each comment with its date, the story title, links to both the comment and the thread, and the full comment text in an easily readable format. You can then copy all the results to your clipboard for further analysis or archiving.
Tool
Percentage Recalculator
— Calculate and normalize multiple percentages to sum to 100%, with the option to exclude specific values from the recalculation. Enter up to four percentage values and check the "Ignore this" box next to any percentages you want to exclude; the tool will automatically recalculate the remaining percentages proportionally so they add up to 100%.
Tool
Alt Text Extractor
— Extract images and their associated metadata from pasted web content with this tool. When you paste rich text containing images, the application automatically retrieves each image's alt text, URL, and generates ready-to-use Markdown and HTML code snippets. Each extracted element can be individually copied to your clipboard for use in documentation, accessibility audits, or content management.
Tool
Bullish vs Bearish - Remember Which is Which!
— Learn the difference between bullish and bearish market sentiment through an interactive visual guide featuring animated bull and bear characters. The page uses intuitive animal metaphors—bulls thrust their horns upward to represent rising markets and optimism, while bears swipe downward to represent falling markets and pessimism. A built-in quiz feature helps reinforce these concepts with randomized questions about market terminology.
Tool
Speech Synthesis Tester
— Test the Web Speech API's speech synthesis capabilities by entering text and configuring voice parameters such as rate, pitch, and volume. The application provides a selection of available system voices and displays real-time status updates as text is being spoken. Users can adjust synthesis settings and stop playback at any time using the intuitive control interface.
Tool
Open Sauce 2025 Schedule
— Browse the Open Sauce 2025 conference schedule with sessions organized by day, including speaker information, session duration, location, and detailed descriptions. Users can search for specific sessions across all three conference days (July 18-20, 2025) and download the entire schedule as an ICS calendar file for integration with their calendar applications. The interface displays current and upcoming sessions in Pacific Time to help attendees plan their conference experience.
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Hacker News, filtered
— Browse the latest Hacker News stories with customizable content filtering to exclude topics of your choice. Enter comma-separated terms to filter out posts matching those keywords across titles, URLs, and descriptions, and click Refresh to load the newest stories or press Enter to re-filter the current feed. Your filter preferences are automatically saved in your browser for future visits.
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