Tools
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Tool
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.
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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, and profile avatar. 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.
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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, and lists while removing unnecessary leading spaces from each line. 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.
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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%.
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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.
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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.
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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.
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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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FFmpeg video crop
— Generate FFmpeg crop commands by uploading a video file and interactively defining a crop area using a draggable overlay. The tool provides both standard and iPhone-compatible FFmpeg command formats that automatically update as you adjust the crop box dimensions and position. This eliminates the need to manually calculate crop parameters for video editing workflows.
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Hacker News Multi-Term Histogram
— Analyze Hacker News stories by searching for multiple terms across a custom time range and visualize the results as an interactive histogram. The tool fetches monthly hit counts from the Hacker News API for each search term, displaying data in a color-coded bar chart, sortable table, and exportable JSON format. Click any bar to view the actual stories matching that term within that month's date range.
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JSON to Markdown Converter
— Convert JSON transcripts from audio into formatted Markdown with speaker names and timestamps. This tool automatically processes JSON data containing speaker names, text, and timestamp information, formatting them into readable Markdown output that can be easily copied and pasted elsewhere. The tool includes instructions for generating the required JSON format using the LLM command-line tool with audio files.
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Reading Time Estimator
— Calculate reading time estimates for any text by pasting or typing content into the input area. The tool displays real-time statistics including word count, character count, and estimated reading duration based on an average reading speed of 230 words per minute. The reading time adjusts dynamically, showing minutes for shorter texts and hours plus minutes for longer content.
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Multi-Tab Sync Chat
— Send chat messages that synchronize instantly across multiple browser tabs using the Broadcast Channel API. Each tab displays messages sent from other tabs with a sync indicator, allowing real-time communication without requiring a backend server. Open multiple tabs of this page to see messages propagate automatically across all instances.
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Transfer time calculator
— Calculate file transfer duration by entering the file size and transfer speed with their respective units. The calculator automatically converts between different measurement units (GB, MB, TB for file size; Mbps, MB/s, KB/s for speed) and displays the estimated transfer time in an easily readable format. Results include a detailed breakdown showing days, hours, minutes, and seconds alongside the calculation parameters.
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Date Calculator
— Calculate the time between two dates with detailed breakdowns and visual representations. This tool displays the total number of days, weeks, business days, and weekend days spanning your selected date range, along with a visual timeline showing where the dates fall relative to today. Use the calculation method options to focus on specific day types such as business days or weekends only.
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Interactive CSS Flexbox Playground
— Experiment with CSS Flexbox properties in real-time using this interactive playground. Adjust container properties like flex-direction, justify-content, and align-items while watching the layout change instantly, then select individual items to customize their flex-grow, flex-shrink, flex-basis, and alignment settings. The dynamically generated CSS code output shows the exact syntax needed to recreate your layout, making it an effective learning tool for mastering flexbox concepts.
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Conference Schedule - ICS File
— Download and view the complete conference schedule for May 22, 2025, in iCalendar format. This page provides access to all 25 events from the San Francisco conference, including keynotes, technical sessions, workshops, and office hours, which can be imported directly into your calendar application. A live preview of the ICS file contents is displayed below the download button for reference.
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