Sound Level Meter – Online Measure Room Noise with Mic
Use your device microphone to measure approximate sound pressure level in dB. Not calibrated, for rough reference. Local only.
UD5 Toolkit
Check your haiku's 5-7-5 syllable pattern instantly — and generate beautiful haiku with one click.
Use your device microphone to measure approximate sound pressure level in dB. Not calibrated, for rough reference. Local only.
Estimate how much rope you need to restring a djembe and the number of verticals. Get traditional Mali weave instructions.
Enter a package name and version range to see all satisfying versions from the registry. Understand ^ and ~.
Tap when you see lightning, tap again when you hear thunder. Calculates how far away the storm is in miles/km. Important outdoor safety tool.
Get a practical, random houseplant care tip. Improve your green thumb. All static data.
Generate comprehensive HTML meta tags for SEO and social sharing (Open Graph, Twitter Cards). Copy ready-to-use code. Boost your search visibility.
Generate a realistic‑sounding exoplanet designation (e.g., Kepler‑442b) and a sci‑fi planet description. For worldbuilding.
Quick reference for frequently used Git commands with examples. Searchable and categorized. A handy resource for all developers.
Enter pond volume and product concentration to determine safe ml or teaspoon of algaecide.
Select a vegetable and see its best companion plants and which to avoid. Visual grid with quick reference. Improve garden yield and health naturally.
Select multiple languages and tools (Node, Python, Mac, Windows) and generate a combined .gitignore.
Calculate water volume for flushing soil based on pot size. Includes recovery timeline reminders.
Select a month and see the modern and traditional birthstones with images and meaning. Classic reference.
Enter a date and location to see moonrise/set times and azimuths. Essential for planning moonlit landscapes.
Enter row length and seed spacing to calculate how many seeds/packets to buy. Reduce waste.
Learn what water is safe (rain, distilled, low PPM) for pitcher plants and flytraps. Visual PPM scale.
Enter your exit weight and canopy size to calculate wing loading. Helps determine if you're within the safe recommended range.
See planets and orbits at true scale (or logarithmic). Scroll from the Sun to Pluto. Understand space distances. Canvas.
Enter desired pom-pom diameter to estimate yards needed and number of wraps. Quick craft math.
Build perfect Open Graph meta tags for rich social media previews. Preview how your link will look on Facebook and LinkedIn. Structured data tools for better CTR.
Select month and hour to see a simple star map with major constellations labeled. Educational astronomy fun.
Calculate how much fertilizer to add based on desired N‑P‑K ppm and water volume. For hydroponics and soil growers.
Enter tank volume and recommended dose to find exact ml or capfuls needed. Avoid overdosing fish.
Roll virtual dice with animated 3D spins. Choose any number and type. See total and individual results. Fun for games.
Calculate how many vegetable plants fit in a given area using square foot gardening or row spacing. Visual plant grid. Plan your spring garden.
Calculate how much liquid fertilizer concentrate to add per gallon of water based on desired N concentration.
Select drip speed or running toilet and see gallons wasted per day and annual cost. Fix leaks!
Calculate how much acid, alkaline buffer, or remineralizer to add to reach target water parameters.
Calculate probability of k successes when sampling without replacement. Useful for quality control and card games.
Enter container height and get recommended depths for each layer (drainage rock, charcoal, moss, soil). Build a healthy miniature ecosystem.