Symptom Diary – Online Record Daily Health Changes
Rate symptoms severity daily and add notes. Visual pain map. Export for doctor visit. Private local storage.
UD5 Toolkit
Rate symptoms severity daily and add notes. Visual pain map. Export for doctor visit. Private local storage.
Compare different insulated containers by their ice retention time based on ambient temperature. Help choose the right bottle for a hot hike.
Explore the contents of the Cache Storage API for your domain. See cached requests and their sizes. Debug offline apps.
Plan a party or event budget by category (venue, food, decorations). See total and cost per guest. Export summary.
Log individual leaf cuttings, track callousing and root development days. Identify which leaves are most viable.
See the current state of a Service Worker for your page: installing, waiting, active. Unregister or skip waiting. Developer utility.
Create a custom cookie consent banner with text, button styles, and colors. Copy the ready‑to‑use HTML/CSS/JS snippet.
Check how many pages a PDF has without uploading it (uses FileReader). Also shows file size and title if available. Simple and fast client-side tool.
A completely black page to save battery on OLED devices. Click to go fullscreen. Simple utility.
A tiny tool that hooks into the console and lets you export all messages to a file. Helpful for non‑technical bug reporting.
Get endless 'Never Have I Ever' statements for your group. Clean and spicy modes. No installation, just pick up and play.
Estimate how long it takes to download/upload a file given bandwidth speed. Also convert between bits and bytes.
Count total DOM nodes on the current page and show warnings if limits exceed best practices. Keep the DOM lean.
Click for a curated motivational quote from famous figures. Share on social media with a single tap. Uplifting.
Create a shadow that appears when a container is scrollable. Pure CSS using background attachments. Copy the style easily.
Fetch a page and list all loaded assets (CSS, JS, images) with their sizes. See total page weight. Quick performance check.
Create circular and elliptical clip paths visually. Adjust radius and position. Copy the CSS. For avatars and masks.
Enter air and snow temperature plus humidity to get the right glide wax color (Swix/Toko). Perfect kick and glide.
Calculate the probability of exactly k successes in n independent Bernoulli trials. Step-by-step result. Local.
Generate a printable pace band for ultra distances with mile/km splits and cumulative time. Adjust for terrain.
Enter a full URL and get all query parameters in a clean table with decoded values. Quickly see UTM and tracking params.
Generate random truth questions and dares for game night. Categories for kids, teens, and adults. No repeats, all client-side fun.
Create CSS clamp() values for fluid typography. Enter min and max font sizes and viewport widths. Modern responsive design.
Simulate memory page reference strings with FIFO, LRU, and Optimal algorithms. See page fault count. OS concept demo.
Compare different grid track sizing methods: fr, auto, minmax(), and fixed values. See how they respond to content.
Paste a list of foreground/background color pairs and instantly see which pass AA/AAA. Perfect for checking entire style guides.
Choose where page breaks should occur for printing. Get the break‑before, break‑after, and break‑inside CSS.
Generate a CSS background that shows a baseline grid. Adjust line‑height and offset. Perfect for aligning text.
Build a conic gradient with any number of color stops. Visual editor. Ideal for creating pie charts or colorful spinners.
Establish a peer‑to‑peer text chat between two browser tabs or devices using WebRTC data channels. All signaling via copy‑paste. No server.