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 921–940 of 1,000 ranked alternatives.

  1. M9 Scientific Calculator Graph app icon

    M9 Scientific Calculator Graph

    Himanshu Nag

    Edit equations, functions, calculate measurements

    Perform advanced calculations with formula editing and recalculation. Generate graphs for complex equations. Support for engineering and computations. Includes graphing capabilities for mathematical functions.

    ★ 0.00 ratingsUtilitiesFreeData updated 2026-09-25
  1. Simple Calculator - App app icon

    Simple Calculator - App

    Hofbets LLC

    Calculate math problems instantly

    Perform basic arithmetic calculations, solve equations, and convert units. Store frequently used values. Access a history log for previous computations.

    ★ 0.00 ratingsEducationFreeData updated 2026-09-06
  2. Unit Converter All Categories app icon

    Unit Converter All Categories

    Vladislav Zhirnov

    Convert units, calculate, and manage tasks

    Convert units across 8 including length, weight, thermal resistance, and magnetism. Switch between metric and imperial systems. Save frequently used conversions. Export results as text or image.

    ★ 0.00 ratingsUtilitiesFreeData updated 2026-09-06
  3. Grade 9 Science Practice app icon

    Grade 9 Science Practice

    Manish Kumar

    With quizzes and tests

    Students can questions chapter by chapter, take mock tests for comprehensive review, and track performance with detailed statistics. Features include quiz-based learning, performance monitoring, and curriculum-aligned .

    ★ 0.00 ratingsEducationFreeData updated 2026-09-06
  4. Age Calculator: Bday Countdown app icon

    Age Calculator: Bday Countdown

    Ahmad Sattar

    Calculate age from birthdate

    Calculate age based on birth date input. Display current age and to next birthday. Track age progression over time. Set reminders for birthdays. Share age information via social media.

    ★ 0.00 ratingsUtilitiesFreeData updated 2026-09-06

How we rank alternatives

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