Service Worker Lifecycle Viewer - Online Debug Tool
See the current state of a Service Worker for your page: installing, waiting, active. Unregister or skip waiting. Developer utility.
UD5 Toolkit
Inspect and manage the cache storage of this domain for Progressive Web Apps.
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See the current state of a Service Worker for your page: installing, waiting, active. Unregister or skip waiting. Developer utility.
Fetch a page and list all loaded assets (CSS, JS, images) with their sizes. See total page weight. Quick performance check.
Log leftovers with date stored and set visual alerts when they need to be eaten. Reduce food waste. Local storage.
Estimate how long it takes to download/upload a file given bandwidth speed. Also convert between bits and bytes.
Enter a full URL and get all query parameters in a clean table with decoded values. Quickly see UTM and tracking params.
Compare different insulated containers by their ice retention time based on ambient temperature. Help choose the right bottle for a hot hike.
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.
Create a custom cookie consent banner with text, button styles, and colors. Copy the ready‑to‑use HTML/CSS/JS snippet.
Connect to a WebTransport server and exchange data over QUIC. See latency and throughput. Perfect for exploring low‑latency real‑time APIs.
Simulate memory page reference strings with FIFO, LRU, and Optimal algorithms. See page fault count. OS concept demo.
Enter air and snow temperature plus humidity to get the right glide wax color (Swix/Toko). Perfect kick and glide.
Count total DOM nodes on the current page and show warnings if limits exceed best practices. Keep the DOM lean.
Establish a peer‑to‑peer text chat between two browser tabs or devices using WebRTC data channels. All signaling via copy‑paste. No server.
A tiny tool that hooks into the console and lets you export all messages to a file. Helpful for non‑technical bug reporting.
Paste a list of foreground/background color pairs and instantly see which pass AA/AAA. Perfect for checking entire style guides.
Rate symptoms severity daily and add notes. Visual pain map. Export for doctor visit. Private local storage.
Plan a party or event budget by category (venue, food, decorations). See total and cost per guest. Export summary.
Calculate the probability of exactly k successes in n independent Bernoulli trials. Step-by-step result. Local.
Enter the characters you need and generate a smaller font file from a TTF/OTF. Keep only the glyphs you use. Using harfbuzz WASM.
Load any variable font from Google Fonts or local file and play with weight, width, slant, and custom axes. Download CSS.
Log individual leaf cuttings, track callousing and root development days. Identify which leaves are most viable.
Generate a printable pace band for ultra distances with mile/km splits and cumulative time. Adjust for terrain.
Place two containers side by side to see how inline‑flex differs from flex. Understand block vs inline formatting.
Choose where page breaks should occur for printing. Get the break‑before, break‑after, and break‑inside CSS.
Create CSS clamp() values for fluid typography. Enter min and max font sizes and viewport widths. Modern responsive design.
Compare different grid track sizing methods: fr, auto, minmax(), and fixed values. See how they respond to content.
See how align‑items: baseline works in grid to align different font sizes on the same baseline. Visual guide.
Create a shadow that appears when a container is scrollable. Pure CSS using background attachments. Copy the style easily.
Create circular and elliptical clip paths visually. Adjust radius and position. Copy the CSS. For avatars and masks.