Safe Room Size Calculator – Online Occupancy & Ventilation Check
Enter number of people and desired duration to estimate the minimum square footage and ventilation CFM for a residential storm shelter.
UD5 Toolkit
Enter number of people and desired duration to estimate the minimum square footage and ventilation CFM for a residential storm shelter.
Go through a room-by-room checklist to identify trip hazards. Print and fix. Prevent accidents.
Type a list of items to find and generate a printable checklist with checkboxes. Great for parties.
Animated demonstrations of different campfire lay styles (teepee, log cabin, star). Choose the right one for wind and cooking.
Simple grid canvas to sketch your home's layout and mark escape routes and meeting point. Print for practice. Local only.
Build a categorized list of possessions with value, serial number, and photo (local). Export for insurance purposes. Private.
Fill in feeding, walking, medication details and generate a clear care sheet for your pet sitter. Print or share.
Randomly picks an indoor activity from a curated list sorted by age. No materials, no prep ideas included. Banish boredom.
Enter a city name to fetch its current Air Quality Index from public APIs. Color-coded health warning. No login.
Enter temperature and wind speed (or humidity) to get the 'feels like' temperature. Safety guidelines included.
Enter skin type and UV index to estimate time to sunburn. Visual countdown reminder to reapply sunscreen or seek shade. Educational only.
Enter appliance usage and see estimated monthly energy consumption. Identify high usage areas.
Set watering schedules for multiple plants with visual alerts. Shows which plants need water today based on last watered date. Data stored locally.
Set a custom watering frequency reminder for succulents, with seasonal adjustment. Visual icon. Works offline after setup.
Enter target RH and room temp to estimate how often to mist or run a humidifier. Quick reference.
Learn about the International Scale of River Difficulty with animations and description of each class.
Select bird species to see recommended maximum bar spacing to prevent escape or injury. Quick reference.
Calculate dew point or relative humidity from temperature and the other parameter. Also computes wet-bulb temperature. Meteorology reference.
Add realistic rain, snow, or fog to any photo. Control intensity and direction. Download the atmospheric result.
Click through symptoms (murky, clear, bacteria) and get the best water treatment method for backcountry trips.
Add plants and track when you last watered them. Get a simple visual alert when it's time to water. Local storage.
View and edit CSV data in a familiar table interface. Add/delete rows and columns, sort, and export. Fully local, no cloud sync.
Add a realistic animated rain or static rain overlay to your image. Adjust opacity and droplet size. Download final.
Calculate how many gallons of water to store based on household size and days. Preparedness aid.
Select your latitude and day of year to see sun path and identify spots with the most direct sunlight for solar garden lights. Simple visual tool.
Type an element name or symbol and instantly see its key properties (atomic mass, group, electronegativity). Quick reference.
Convert oven recipe temperature and time to air fryer settings. Quick reference.
Enter a phrase and find all possible anagram combinations (if computationally feasible). Lexicographic fun.
If device has ambient light sensor, estimate lux level and recommend plant types. Local only.
Enter height and get fall time and impact speed. Simple physics demo. Good for students.