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 561–580 of 1,000 ranked alternatives.

  1. PixelCalc app icon

    PixelCalc

    John Lullie

    Digital image conversion and resizing tool.

    The app converts pixels to inches and inches to pixels for digital images. It includes a proportional calculator for resizing images and reference charts for print sizes and shutter speeds.

    ★ 0.00 ratingsProductivity$2.99Data updated 2026-09-14
  1. Air Products Gas Converter app icon

    Air Products Gas Converter

    Air Products and Chemicals Inc

    Convert industrial gas weight and volume.

    The app converts weight and volume measures for industrial gases and liquefied natural gas. It accounts for molecular weight and density when converting between liquid and gaseous units.

    ★ 5.09 ratingsReferenceFreeData updated 2026-10-04
  2. Golden Ratio Calculator Plus app icon

    Golden Ratio Calculator Plus

    Heng Jia Liang

    Calculate sides and totals

    Calculate the using inputs for the longest side, shorter side, or combined length. Perform instant calculations with support for up to 16 decimal places and various units. Copy results to another and view the formula as a reference.

    ★ 2.33 ratingsUtilities$2.99Data updated 2026-09-06
  3. Calculator - Currency - Unit app icon

    Calculator - Currency - Unit

    hua-shan cheng

    Calculate, convert, and track values

    Scientific with and conversion capabilities. Perform complex calculations, convert currencies, and switch units. Review and reuse calculation history. Use landscape mode for efficient input and history viewing.

    ★ 5.04 ratingsUtilitiesFreeData updated 2026-09-06
  4. Telescope Eyepiece Calculator app icon

    Telescope Eyepiece Calculator

    Cederic Schmid

    Calculate specs offline

    Calculate magnification, exit pupil, true field of view, and f-ratio based on aperture, focal length, and type. Color badges indicate optimal viewing conditions. Results update in real time as inputs change.

    ★ 1.01 ratingsReferenceFreeData updated 2026-09-06

How we rank alternatives

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