Thunder & Lightning vs GPF Easy Calendar

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.

GPF Easy Calendar is a simple and private calendar app for iOS, designed for users who want a clean monthly view and essential event management without unnecessary complexity. The app provides a clear month grid with Monday as the first day of the week, intuitive navigation between months, and easy day selection. Events can be added with a title and optional notes, and are displayed instantly in the selected day panel. All events are stored locally on the device and persist after closing or restarting the app. No account, registration, or cloud connection is required. Key Features: • Monthly calendar view with fast navigation • Clear day selection and visual highlighting • Add events with title and notes • Instant event visibility per selected day • On-device storage with automatic persistence • High-contrast interface with consistent Menlo typography GPF Easy Calendar focuses on clarity, privacy, and reliable daily planning.