e: Spacetime Converter app icon

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.

by Elliptics, Ltd.★ 5.01 ratingsEducationFreeData updated 2026-09-10

e: Spacetime Converter screenshots

Ranked alternatives

Showing 121–140 of 1,000 ranked alternatives.

  1. Calculator: Pro app icon

    Calculator: Pro

    Appgeneration, Software Technologies, Lda

    Calculate, convert, and solve equations

    MyCalc offers basic and scientific calculation functions. Users can switch between portrait and landscape modes. It supports currency and unit conversions. Results, equations, and conversions can be copied, shared, or saved.

    ★ 4.7570 ratingsProductivityFreeData updated 2026-09-06
  2. Age Calculator: DOB & Birthday app icon

    Age Calculator: DOB & Birthday

    kasula rajesh

    Calculate age in seconds and years

    Calculate age in years, months, days, hours, minutes, and seconds by entering a birthdate. View remaining days until next . Break down total lived time into years, months, weeks, days, hours, minutes, and seconds. Save and organize information.

    ★ 4.8161 ratingsUtilitiesFreeData updated 2026-09-06
  3. VoiceCalc: AI Voice Calculator app icon

    VoiceCalc: AI Voice Calculator

    Yeonni Lee

    Solve math problems

    Allows users to perform calculations by without typing. It solves math problems using AI models like ChatGPT and Gemini. Users can ask for comparisons, bill splits, and percentage discounts. The converts units and time formats instantly.

    ★ 4.466 ratingsProductivityFreeData updated 2026-09-06
  1. Dutch Oven Helper app icon

    Dutch Oven Helper

    Kyle Kendall

    Calculate briquettes for meals

    Calculate briquettes needed for cooking based on temperature, size, and method. Adjust settings for precise heat distribution. View calculated numbers for top and bottom briquettes. Sync with recipe details for accurate cooking adjustments.

    ★ 4.6820 ratingsFood & DrinkFreeData updated 2026-09-08
  2. Mila's Unit Converter PRO app icon

    Mila's Unit Converter PRO

    Scott DeSapio

    Convert units across 16 categories

    Convert units across 16 categories with instant accuracy. Switch between hundreds of units for length, weight, temperature, and more. Calculate conversions for cooking, engineering, travel, and study.

    ★ 4.81,014 ratingsUtilities$9.99Data updated 2026-09-08
  3. Simple Unit Convert Pro app icon

    Simple Unit Convert Pro

    Annika Gadman

    Units between Fahrenheit and Celsius

    Units between Fahrenheit and Celsius, miles per hour and kilometers per hour, miles and kilometers, feet and meters, square feet and square meters, pounds and kilograms, cups and deciliters, and fluid ounces to milliliters.

    ★ 5.04 ratingsUtilitiesFreeData updated 2026-09-06
  4. Distance Measure app icon

    Distance Measure

    Robin Betjes

    Between waypoints

    Distances between waypoints or calculate surface areas using map polygons. Set waypoints by tapping and holding. Choose units like kilometers, miles, or nautical miles. Access settings to change map type or view the manual.

    ★ 4.3239 ratingsUtilitiesFreeData updated 2026-09-08
  5. Ani - Real-Time Age Calculator app icon

    Ani - Real-Time Age Calculator

    Oleh Stasula

    Calculate age in real time and track

    Calculate age in years, months, weeks, days, hours, minutes, and seconds. Track days left to next milestones. Receive notifications when milestones are reached. Display age with a widget.

    ★ 4.798 ratingsLifestyleFreeData updated 2026-09-10
  6. Unit Plus Converter app icon

    Unit Plus Converter

    Harjot Singh

    Convert units between categories with ease

    Convert units across multiple categories including area, data, fuel-milage, length, power, pressure, speed, temperature, time, volume, and weight-mass. Switch between units with a single tap. View conversion results and history.

    ★ 4.7505 ratingsUtilitiesFreeData updated 2026-09-06
  7. My Units Converter app icon

    My Units Converter

    MIIN Ltd

    Convert across length, mass, area, volume, temperature,

    Convert of length, mass, area, volume, temperature, and time. Switch between and view results for two selected . Access a list of all in each category. Share conversion results with others.

    ★ 5.01 ratingsProductivityFreeData updated 2026-09-06
  8. Speedometer mph Odometer app icon

    Speedometer mph Odometer

    SHIGETO TAKAGI

    Track speed and distance with GPS

    Displays speed and distance using GPS. Tracks maximum speed with vibration alerts. Shows position and time of maximum speed on a map. Switches between light and dark modes. Notifies of GPS measurement errors. Supports motorcycles, cars, and planes.

    ★ 4.5773 ratingsSportsFreeData updated 2026-09-08
  9. Cross Stitch Calculators app icon

    Cross Stitch Calculators

    Diana Białogrzywa

    Calculate fabric size and material needs

    Calculate fabric size in centimeters or inches based on count and fabric type. Determine thread consumption for specified stitches. Input project details to estimate material needs. Export calculations for reference.

    ★ 4.7296 ratingsLifestyleFreeData updated 2026-09-06
  10. Unit Converter - 14-in-1 app icon

    Unit Converter - 14-in-1

    Xi'an 7kit Technology Co., Ltd.

    Convert units with precision and style

    Convert units across 14 categories including length, weight, and temperature. Switch between metric, imperial, and Chinese traditional systems. Customize display formats and save frequently used conversions.

    ★ 5.03 ratingsUtilitiesFreeData updated 2026-09-06
  11. Construction Calculator app icon

    Construction Calculator

    Sarah Ragab

    Convert measurements with precision and ease

    Convert decimals to fractions and vice versa. Display equations and results simultaneously. Edit calculations easily. Add to Today Screen for quick access. Ideal for , woodworking, and homework verification.

    ★ 4.7637 ratingsUtilitiesFreeData updated 2026-09-10
  12. Chemical Engineering AppSuite HD app icon

    Chemical Engineering AppSuite HD

    Vector 254 LLC

    Convert units, calculate formulas, track reactions

    Calculate reactions with built-in equations and thermodynamic data. Convert units for pressure, temperature, and concentration. Solve material and energy balance problems. Access property tables for gases and liquids.

    ★ 4.680 ratingsProductivity$0.99Data updated 2026-09-08
  13. Tile Calculator Pro app icon

    Tile Calculator Pro

    Anna Filobok

    Calculate area with dimensions and gaps

    Calculate area by inputting width and length in feet, inches, or meters. Convert between imperial and metric units in real time. Determine quantity with gap size and waste percentage. Identify floor or wall based on dimensions.

    ★ 5.02 ratingsUtilitiesFreeData updated 2026-09-06
  14. Unit Converter · 14-in-1 app icon

    Unit Converter · 14-in-1

    Xi'an 7kit Technology Co., Ltd.

    Convert units with precision and style

    Convert units across 14 categories including length, weight, and temperature. Switch between metric, imperial, and Chinese traditional systems. Customize display formats and save frequently used conversions.

    ★ 0.00 ratingsUtilities$0.99Data updated 2026-09-06
  15. Roof Guide - Carpentry Calc app icon

    Roof Guide - Carpentry Calc

    Infoguide Pty Ltd

    Calculate , deck, and concrete dimensions

    Calculate pitches, angles, and rise/run ratios. Estimate decking, stair, stud wall, and concrete quantities and costs. Switch between US and metric units. Input measurements for precise material estimates. Export results for project planning.

    ★ 4.116 ratingsUtilitiesFreeData updated 2026-09-09

How we rank alternatives

Apps are ranked by functional similarity, category fit, rating confidence, and popularity.