Random User Agent String Generator - Online for Testing
Generate a realistic, random user‑agent string for desktop, mobile, or bot. Perfect for API testing and scraping.
UD5 Toolkit
Randomly assign gift‑exchange pairs with custom exclusion rules. Works perfectly for offices, families, and friends.
Generate a realistic, random user‑agent string for desktop, mobile, or bot. Perfect for API testing and scraping.
Spin a colorful wheel that lands on Yes, No, or custom answers. Includes sound effects and adjustable probability. Local fun decision maker.
A festive countdown showing days, hours, minutes until December 25. Animated snow and music toggle. Local time.
Fill in title, date, time, and location to generate a downloadable .ics meeting invitation. Works with all major calendars.
Adjust opacity visually with a slider and see the different CSS representations (opacity property vs RGBA/HSLA). Copy best option.
Paste your own text and generate a random sentence that mimics its style. Use for creative writing prompts or testing. Fully local.
Generate CUIDs that are optimized for horizontal scaling and collision resistance. Great for client‑side IDs. Pure JavaScript.
Set any future date and see a live countdown in days, hours, minutes, seconds. Fun animated display. Save multiple countdowns locally.
Click for a warm, encouraging sentence to lift your spirits or support a friend. Small positive boost. No repeats.
Generate a Lit Element web component skeleton with styles and properties. Copy and start coding immediately.
Create a random, aspirational quarterly objective with unrealistic key results. For meeting icebreakers.
Set your birth date and see a live countdown with days, hours, minutes, and seconds. Shareable link. Pure frontend.
Turn your browser screen into a full‑color flashlight or strobe. Adjust brightness and color. Simple utility.
Virtual flip coins thousands of times and see the heads/tails ratio converge to 50%. Interactive law of large numbers.
Register a service worker, subscribe to push, and send a test notification using a VAPID key pair. Step‑by‑step demo.
Fill in your details and generate a professional‑looking invoice ready to print or save as PDF. No sign‑up, all data stays on your device.
Fill in your details and generate a professional-looking invoice ready to print or save as PDF. No sign-up, all data stays on your device. Great for freelancers.
Build a properly formatted robots.txt file with user-agent rules and sitemap location. Validate syntax in real time. Essential for webmasters.
Paste a user agent string to get a human-readable breakdown of browser, operating system, and device. See your own current agent info automatically.
Record your screen, window, or tab with audio directly in the browser. Download the recording as a WebM file. No upload.
Record your screen, window, or tab with audio directly in the browser. Download as WebM. No extension required.
Set a list of agenda items with allocated minutes. Advance through speakers and see remaining time visually. Keep meetings on track.
Enter a URL and generate a responsive iframe embed code with correct aspect ratio. Supports YouTube, maps, and more.
Create a reflection effect for images or text using box‑reflect. Adjust direction and offset. Copy the CSS.
Compare :focus and :focus‑visible styling. See which one applies when using mouse vs. keyboard. Accessible focus management.
Convert REM values to pixels and vice versa based on your root font size. Essential for scalable web typography.
Create a custom element with named slots and see content projection in action. Learn Web Components basics.
Paste your speech, set time limit, and practice with a pacing indicator (words per minute). Refine delivery.
Record feeding times, side (left/right for nursing) or oz for bottle. Track daily patterns. Data stays in your browser. Simple newborn helper.
Track attendance for multiple subjects. Mark present/absent and see percentage. Data in localStorage. Simple student tool.