Apps Like e: Spacetime Converter for iPhone and iPad
Convert length and time relativistically.
The app converts between length and time using geometrized units where the speed of light is unity. It allows users to think about the world differently by converting units like inches to seconds or miles to years.
e: Spacetime Converter screenshots
Ranked alternatives
Showing 441–460 of 1,000 ranked alternatives.






Calculator....
Tamer Elsharqawy
Calculate numbers quickly and accurately
Perform basic arithmetic operations, calculate percentages, and convert units. Access scientific functions, memory storage, and equation solving. Share results via copy or screenshot.



Roadtrip: Fuel & Trip Planner
Verosocial Studio
Practical road trip calculator for drivers.
The app estimates fuel costs, trip duration, and budget totals for road trips. It converts MPG, calculates costs in US or metric units, and supports splitting expenses per passenger.


Age Calculator; Date of Birth
Ankit Seth
Calculate age in years, months, days, hours,
Enter a of to calculate age in years, months, days, hours, minutes, and seconds. View real-time updates of seconds alive. Receive fun facts about milestones like the 10,000th day alive. Sync with calendar for event reminders.




Basic Electronic Calculator
Gergely Nagy
Calculate voltage, current, resistance, and power
Calculate voltage, current, resistance, or electric power by entering any two values. Convert results between normal and scientific notation. Display calculated values clearly.


How we rank alternatives
Apps are ranked by functional similarity, category fit, rating confidence, and popularity.