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 581–600 of 1,000 ranked alternatives.

  1. Kalc app icon

    Kalc

    YUTA OKAJIMA

    Convert units, calculate, track time

    Convert units between different systems with a simple interface. Perform basic and advanced calculations. View and switch between time zones with an intuitive world clock.

    ★ 4.73 ratingsUtilitiesFreeData updated 2026-09-08
  2. Drafting Utility :TriangleCalc app icon

    Drafting Utility :TriangleCalc

    Masaharu Tsukamoto

    Calculate triangle sides and angles

    TriangleCalc calculates triangle side lengths and angles by entering two values. Automatically computes remaining sides and angles. Displays results in clear numerical format. Supports basic trigonometric calculations for triangles.

    ★ 0.00 ratingsProductivityFreeData updated 2026-09-06
  3. Engineering Survey Calculator app icon

    Engineering Survey Calculator

    V PUGAZHENTHI

    Calculate parameters and units

    Calculate standard deviation, probable error, and error of the mean for surveying and civil measurements. Switch between imperial and metric units. Perform calculations for series of observations and single or combined accidental errors.

    ★ 5.01 ratingsUtilities$2.99Data updated 2026-09-08
  4. PATH Companion app icon

    PATH Companion

    VERMONT EDUCATION HEALTH INITIATIVE INC

    Track exercise progress with Apple Health.

    The app tracks exercise progress and syncs with Apple Health. Users can add records on their phone or the web, and they update automatically in both places.

    ★ 2.18 ratingsHealth & FitnessFreeData updated 2026-10-14

How we rank alternatives

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