Thunder & Lightning vs Dwell Secure

Thunder & Lightning has (barely) one practical purpose: to measure your distance to a sound source. It works for thunder and lightning, fireworks, rocket launches, or other loud events visible from a (hopefully safe) distance away. Just press the Lightning button when you see the event, and Thunder when you hear it. Modern technology does the rest. To perform this trivial task even more accurately, you can enter the temperature of your surroundings to more precisely calculate the speed of sound. You can also choose between U.S./Imperial and metric measurements depending on your personal unit preferences. Should its intended purpose be insufficiently useful, this application can also be used as a reasonably precise (if redundant) stopwatch, a speed-of-sound calculator, a Fahrenheit/Celsius converter, or as an odometer if you happen to be traveling at precisely the speed of sound. Note: Use of application while operating supersonic aircraft is not recommended or approved.

Dwell Secure — Home Documentation & Emergency Preparedness Born from a firefighter's firsthand experience with the chaos emergencies create, Dwell Secure helps homeowners, renters, and property managers document everything that matters about their property — so when something goes wrong, the information is already at your fingertips. Document Your Home's Vital Systems -------------------------------------- Capture detailed records of every service in your home — HVAC, plumbing, electrical, water heaters, appliances, and more. - Store locations, photos, make/model details, warranty dates, and notes - Record serial numbers and installation dates - Never scramble to find a shut-off valve location again - Upload floor plans and property maps - Annotate photos to pinpoint emergency shutoffs and key equipment - Create interactive maps showing service locations throughout your property Stay Ahead with Maintenance Tracking - Set up maintenance schedules with reminders - Track what's been done, what's coming due, and what's overdue - Keep everything organized in one place Share Access with the People Who Need It - Invite family members, partners, roommates, tenants, or property managers - Flexible permission levels — view, edit, or emergency-only access - Everyone gets the information they need to handle emergencies or routine upkeep Manage Any Property Type - Single-family homes, condos, apartments, and ADUs - Boats, RVs, and other mobile properties - Store operating instructions, maintenance reminders, and vendor contacts Property Health Checkup - Track your setup progress with a built-in health checkup - Get guided through documenting services, uploading photos, creating maps, and sharing access - Complete every step and share your achievement Keep Your Trusted Vendors Handy - Store contact details for every service provider - Link vendors directly to the services they maintain - When something breaks, know exactly who to call Emergency Guides & Special Needs - Create step-by-step emergency procedures - Document accessibility requirements, pets, and medical considerations - Ensure anyone with property access knows what to do and who to care for Your Data, Your Control - Two-factor authentication and flexible sharing permissions - Revoke access to shares at any time - Works offline on mobile devices so your information is always available