Comparison

e vs Time Dilation Explorer Lab

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

e

Explore the universe of spacetime by converting lengths into time and vice versa. This unique calculator uses geometrized units to help you think about the world in new ways and amuse your friends. It's a fun tool for science enthusiasts and students alike.

Highlights
  • Convert length to time
  • Convert time to length
  • Geometrized units (c=1)
  • Avoids scientific notation
  • Supports various input units
  • Educational and entertaining
Read full description

Have you thought about how old you are - in meters? Or how tall you are - in seconds? Or how many miles it is until your next birthday? Let's think out of the box, relativistically. While spacetime intervals are constant, length and time can be converted to each other. This calculator makes use of geometrized units (where the speed of light is unity) and lets you convert conveniently between length and time. Is this a useful conversion tool in your day-to-day life? Probably not. But maybe it will let you think about the world a little differently. And amuse your friends and family at the same time! For a technical reference, refer to "Gravitation", by Misner, Thorne and Wheeler, 1973, W.H. Freeman and Company, pp. 35-36. To make things more accessible to the average user, we have tried to avoid displaying scientific notation in numbers as much as possible and, instead, make use of more common terms, such as "billions of miles" and "milliseconds". Now upgraded with the ability to choose different lengths and times for input (inches, hours, days, etc.)! keywords: science, physics, space, time, relativity, calculator ---------------- Reviews from around the world: from Fox Knight, US Love this app!! from highschool student, US Good job, there's a lot of potential here. . . from Turbo elf, US Science geek must buy from Letter Warrior, US I love this idea, especially seeing how far it is until tomorrow, or a friend's birthday. from Professor and wife, US A great application that can also be used by students ... really is a wonderful game.

About

Time Dilation Explorer Lab

Features
Read full description

Time Dilation Explorer Lab turns special relativity into an interactive space-science lab. Slide toward the speed of light and watch time change in real time. Compare Earth time with traveler time, explore the light-clock thought experiment, send a virtual ship toward nearby stars, and learn why Einstein's ideas matter in real science and technology. Designed for curious learners, students, teachers, and space fans, the app explains time dilation, length contraction, the twin paradox, light speed, GPS corrections, and near-light-speed travel through visual simulations and short lessons. Key features: - Interactive time dilation simulator with Earth and traveler clocks - Speed vs Time graph for comparing journeys across cosmic distances - Light Clock demo showing why moving clocks tick slower - Twin Paradox visualization with Earth twin and traveler twin timelines - Length Contraction lab for seeing fast-moving objects shrink along motion - Cosmic Journey mode with destinations from the Moon to Andromeda - Bite-sized relativity lessons with examples, takeaways, and fun facts - Quiz mode with categories, best scores, streaks, and hints - Progress dashboard with lesson completion, quiz progress, and badges - Daily relativity facts and achievement rewards The free version includes core simulations, starter lessons, quizzes, and selected destinations. A one-time Premium unlock removes ads and opens advanced lessons, full-speed controls, expanded quiz content, extra destinations, and additional interactive tools. Whether you are reviewing physics for school, introducing relativity in a classroom, or simply wondering what a near-light-speed journey would feel like, Time Dilation Explorer Lab helps make spacetime visible.

Screenshots

e4 screens
Time Dilation Explorer Lab4 screens

Verdict

The call

The clearest difference is in-app purchases: e at none against Time Dilation Explorer Lab's 1. e also leads on ads (none vs shown) and iOS requirement (15.5 vs 26.2). On price and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Time Dilation Explorer Lab sells 1 one-off in-app purchase. e asks for nothing beyond the download.

Scorecard3 real differences · 7 level
e versus Time Dilation Explorer Lab: the parameters behind the verdict, then further details
ParametereTime Dilation Explorer Lab
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews90.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 11 months—
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.5 — better26.2
Further details — not scored
Size4 MB16 MB
Age rating4+4+
DeveloperElliptics, Ltd.ChatStick Company Limited

In-app purchases

None

e

No in-app purchases

1 purchases

Time Dilation Explorer Lab

One-time1
  • Unlock All Features$2.99

Questions

Is e free?
e is free to download, with no in-app purchases.
Is Time Dilation Explorer Lab free?
Time Dilation Explorer Lab is free to download, with in-app purchases available.
Do e or Time Dilation Explorer Lab have ads?
Time Dilation Explorer Lab shows ads; e does not.

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