Battery Life Calculator - Online Device Runtime Estimator
Estimate how long a battery will last given capacity (mAh/Wh) and load current. Also computes backup time for power banks. Quick and local.
UD5 Toolkit
Estimate how long a battery will last given capacity (mAh/Wh) and load current. Also computes backup time for power banks. Quick and local.
Calculate flour, water, starter amounts to achieve a target loaf hydration. Adjusts for starter hydration. Instant local calculation.
Access the Paint Timing API and display First Paint, First Contentful Paint, and Largest Contentful Paint times. Quick perf check.
Set an alarm relative to today's sunset (e.g., 30 minutes before). Perfect for evening routines. Uses geolocation (optional).
See your device's battery level, charging status, and discharge time using the Battery Status API. Fun utility.
Paste a raw server log snippet and see a structured table with IP, method, URL, and status. Quick audit.
List all resources loaded by the current page and their detailed timing breakdown. Inâbrowser waterfall.
Connect to a BLE device and read its Battery Service characteristic. See the charge level in a gauge.
Easily compute posterior probabilities given prior, likelihood, and marginal likelihood. Visual diagram. All local.
Enter any integer and quickly find the next prime number after it. Perfect for hashing and puzzles.
Swap between physical and logical properties (marginâinline vs marginâleft). Live preview with writingâmode. Internationalize your CSS.
Schedule tasks with userâvisible, userâblocking, or background priority. See execution order and delays. Modern web perf.
See the current Service Worker registration, its state, and scope. Send 'skipWaiting' and update. PWA debug.
See the current state of a Service Worker for your page: installing, waiting, active. Unregister or skip waiting. Developer utility.
Build a renovate.json file to automate dependency updates. Choose schedule, automerge, and package rules. Local.
Enter a URL and instantly generate a PDF version using the browser's print-to-pdf engine. Private, no upload.
Enter a URL and instantly generate a PDF version using the browser's print-to-pdf engine. Private, no upload.
Enter network name and password to generate a stylish printable card for visitors. Local, no data leak.
Log shedding events, note duration, and track humidity to optimize next cycle. Healthy scales.
Create promises that resolve or reject after a delay. See state changes and chain .then/.catch. Debug async code.
Load images or use colors and apply all 15 CSS blend modes. Visual tester for creative effects.
A completely black page to save battery on OLED devices. Click to go fullscreen. Simple utility.
See every HTML input type in one page. Check browser support and styling. Copy sample markup. Quick frontend reference.
Apply userâselect: none, text, all and see how it affects selection. Copy the CSS snippet for your UI elements.
Manipulate CSS values as typed objects using attributeStyleMap. Convert between CSSUnitValue, CSSMathSum, etc. Futuristic CSSâinâJS.
Register a custom CSS property with syntax, initial value, and inherits. Animate colors and numbers that couldnât before.
Paste your CSS and see rules sorted by specificity. Find overrides and potential collisions. Understand your cascade.
Apply willâchange to any element and see its effect on compositing. Learn best practices for smooth animations.
Convert English sea yarns into pirate lingo. Arrrâmatey generator. Perfect for September 19th.
Build a Vite configuration file by selecting plugins (Vue, React, etc.), aliases, and build options. Copy the final code.