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 81–100 of 1,000 ranked alternatives.

  1. Body Mass Index Calculator BMI app icon

    Body Mass Index Calculator BMI

    Armchair Engineering

    Calculate BMI and healthy weight range

    Calculate BMI using height and weight. Determine healthy weight range based on height. Choose height units from mm, cm, m, km, inches, feet. Select weight units from kg, lb. Set decimal places for precision.

    ★ 4.824 ratingsHealth & FitnessFreeData updated 2026-09-10
  2. Patio Calculator Plus app icon

    Patio Calculator Plus

    Calc Hub, LLC

    Calculate materials accurately

    Calculate material needs for patios using seven estimators: concrete slab, pavers, paver base, polymeric sand, sand & gravel, area, and volume. Input dimensions in inches, feet, yards, centimeters, or meters.

    ★ 4.8218 ratingsUtilitiesFreeData updated 2026-09-06
  1. Length Converter app icon

    Length Converter

    Anna Filobok

    Convert lengths between feet, inches, meters,

    Convert lengths between Feet, Inch, Meter, Decimeter, Centimeter, and Millimeter. Enter a value and select units to switch. Save frequently used conversions for quick access.

    ★ 4.812 ratingsUtilities$1.99Data updated 2026-09-06
  2. Speedometer - Real Time app icon

    Speedometer - Real Time

    Mark Dietrich

    Track speed

    Track speed in using units like meters per second, miles per hour, and kilometers per hour. Display speed in English or Spanish. Allow users to request additional language support.

    ★ 4.6105 ratingsNavigationFreeData updated 2026-09-06
  3. Calculator Speed Distance Time app icon

    Calculator Speed Distance Time

    Maksims Kirhensteins

    Calculate , , and

    Calculate , , or with simple input fields. Switch between units like mph, km/h, and m/s. Save calculation history for quick reference. Share results via email or messaging.

    ★ 4.713 ratingsProductivity$2.99Data updated 2026-09-11
  4. Unit Converter ( Calculator ) app icon

    Unit Converter ( Calculator )

    EONSOFT

    Convert units for length, weight, volume, temperature,

    Convert units for length, weight, width, volume, velocity, temperature, and pressure. Select the desired and perform conversions. Use tabs to switch between categories. Input values and receive converted results.

    ★ 4.8128 ratingsLifestyleFreeData updated 2026-09-09
  5. Calculator HD: Big Buttons app icon

    Calculator HD: Big Buttons

    Studio Zebra

    Calculate with large, easy-to-read numbers

    A for with a large, easy-to-read display. Perform basic arithmetic operations. Use user-friendly controls for quick calculations.

    ★ 4.51,938 ratingsUtilitiesFreeData updated 2026-09-10
  6. HamAntCal app icon

    HamAntCal

    State Road 41 Apps LLC

    Calculate antenna lengths in feet or metric

    Calculate antenna lengths for dipoles, inverted vee, and vertical antennas in feet/inches or metric. Input frequency and select antenna type to get starting length. View 1/8, 1/4, 1/2, 5/8, and full wave options.

    ★ 4.657 ratingsUtilities$0.99Data updated 2026-09-08
  7. Distance Tool app icon

    Distance Tool

    Applorium Ltd

    Calculate distances and areas on a map

    Calculates distances between map points and areas of non-overlapping polygons. Users can switch between metric and imperial units. Coordinates are displayed in decimal or degrees, minutes, and seconds.

    ★ 4.42,155 ratingsUtilitiesFreeData updated 2026-09-08
  8. inch mm converter app icon

    inch mm converter

    SDG CODE DOO NIS

    Convert inches to millimeters instantly

    Convert inches to millimeters with a simple interface. Enter measurements and receive instant conversions. Supports both imperial and metric units. Save frequently used conversions for quick access.

    ★ 4.696 ratingsUtilitiesFreeData updated 2026-09-06
  9. inchCALC+ app icon

    inchCALC+

    William Lipsey

    Feet Inch Fraction Construction Calculator

    The app transforms a device into a construction calculator for feet, inches, and fractions. It performs calculations and conversions for various measurement units, including a triangle function for rise, run, diagonal, and pitch.

    ★ 3.717 ratingsUtilities$4.99Data updated 2026-09-10
  10. Calculator XLt app icon

    Calculator XLt

    Gero Mazza

    Calculate, convert, and compare values

    Perform calculations with a standard featuring extra-large buttons and functions like delete, x², √, and %. Use a scientific with 30 advanced functions. Convert units, calculate loans, and determine tips.

    ★ 4.7573 ratingsProductivityFreeData updated 2026-09-08
  11. QuiltingCalc app icon

    QuiltingCalc

    Handmade Interactive LLC

    Convert yards to inches and meters

    Quilting calculators help convert units between yards and inches, meters and centimeters. Determine fabric needed for backing, batting, and borders. Calculate rectangular pieces from larger fabric.

    ★ 4.2144 ratingsUtilitiesFreeData updated 2026-09-08
  12. Land Measure Pro app icon

    Land Measure Pro

    Pendlebury Software LLC

    Area, length, and angles on maps

    Area, lengths, and angles on maps using an interactive crosshair. Trace outlines to create connected points, updating area and perimeter in real time. Adjust radius for scaling features. View dynamic length and angle as you move the crosshair.

    ★ 3.122 ratingsProductivity$1.99Data updated 2026-09-08
  13. Wordflex Touch Dictionary app icon

    Wordflex Touch Dictionary

    Robert Scheiner

    Explore words, definitions, and examples

    Explore word meanings, parts of speech, and related terms through interactive word trees. Manipulate entries with gestures to navigate definitions, examples, and etymology.

    ★ 4.8135 ratingsEducationFreeData updated 2026-09-08

How we rank alternatives

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