Solar System Simulator 2D - Online Top‑Down Orrery
Watch the planets orbit the Sun in a top‑down 2D view. Adjust speed and zoom. Distances not realistic; beautiful model.
UD5 Toolkit
Watch the planets orbit the Sun in a top‑down 2D view. Adjust speed and zoom. Distances not realistic; beautiful model.
Select month and hour to see a simple star map with major constellations labeled. Educational astronomy fun.
Generate a realistic‑sounding exoplanet designation (e.g., Kepler‑442b) and a sci‑fi planet description. For worldbuilding.
Enter a date and location to see moonrise/set times and azimuths. Essential for planning moonlit landscapes.
Select aperture and see a list of deep-sky objects visible tonight with binoculars. Log what you saw.
Select a vegetable and see its best companion plants and which to avoid. Visual grid with quick reference. Improve garden yield and health naturally.
Calculate how much fertilizer to add based on desired N‑P‑K ppm and water volume. For hydroponics and soil growers.
Find the optimal TV size for your room or the best viewing distance based on screen size and resolution (1080p, 4K, 8K). Simple THX/SMPTE reference.
Calculate projector throw distance or screen image size based on throw ratio. Visualize setup. Essential for home theater planning. Local.
Enter a CSS value in vw/vh and see the actual pixel size at current viewport. Dynamic resize demo.
Enter container height and get recommended depths for each layer (drainage rock, charcoal, moss, soil). Build a healthy miniature ecosystem.
Convert diopter strength to approximate magnification and working distance for macro photography.
Calculate how many vegetable plants fit in a given area using square foot gardening or row spacing. Visual plant grid. Plan your spring garden.
Enter your exit weight and canopy size to calculate wing loading. Helps determine if you're within the safe recommended range.
Compute the Euclidean distance between two points in 2D or 3D space. Also shows midpoint. Quick geometry helper.
Calculate how much liquid fertilizer concentrate to add per gallon of water based on desired N concentration.
Find the right heater wattage for your fish tank based on volume and desired temperature rise. Simple rule-of-thumb calculator. Local only.
Learn what water is safe (rain, distilled, low PPM) for pitcher plants and flytraps. Visual PPM scale.
Create a custom bird seed blend by mixing ingredient percentages. Calculates total weight and helps attract specific bird species with the right nutrition.
Estimate how much rope you need to restring a djembe and the number of verticals. Get traditional Mali weave instructions.
Convert between inches of mercury and hectopascals for altimeter setting. Essential for pilots.
Calculate how much acid, alkaline buffer, or remineralizer to add to reach target water parameters.
Calculate water volume for flushing soil based on pot size. Includes recovery timeline reminders.
Type a line and see syllable count as you write. Generate nature-themed prompts. Poetry aid.
Use the pH and KH relationship to estimate dissolved CO2 concentration in your planted tank. Reach 30ppm safely for lush plant growth.
Select drip speed or running toilet and see gallons wasted per day and annual cost. Fix leaks!
Calculate grout needed (lbs or kg) based on tile size, grout joint, and area. Also recommend spacer size. Local estimator.
Based on your calorie goal, get the perfect gram split of proteins, carbs, and fats. Adjust ratios. For fitness and health.
Enter pond volume and product concentration to determine safe ml or teaspoon of algaecide.
Calculate liquid or tablet dosage for dogs/cats based on weight and prescribed mg/kg. Check your vet's math. Educational, always consult vet.