# e vs Relativistic Space

The clearest difference is rating: e at 5.0 against Relativistic Space's 3.7. e also leads on update cadence (every 11 months vs every 75 months). Relativistic Space's advantage is review sentiment (100% vs 90%) and ratings volume (3 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

e holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews complicate that: 90% of e's written reviews are positive against 100% of Relativistic Space's, so the app with the better star average is not the one people write more warmly about.

e ships an update every 11 months, Relativistic Space every 75 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | e | Relativistic Space |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/e-spacetime-converter/id291317973/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/relativistic-space-time/id1463093650/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | 90.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 11 months** | Every 75 months |
| Monetization | Free | Free |
| Size | 4 MB | 52 MB |
| Requires iOS | 15.5 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Elliptics, Ltd.](https://appshunter.io/developer/289108972) | [Thieberson Gomes](https://appshunter.io/developer/1434771806) |

## What reviewers say

### e

[App page](https://appshunter.io/ios/app/e-spacetime-converter/id291317973)

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

**In-app purchases:** none


### Relativistic Space

[App page](https://appshunter.io/ios/app/relativistic-space-time/id1463093650)

This educational tool simulates the behavior of space and time at high speeds. Developed as part of a master's dissertation, it focuses on relativistic effects without considering acceleration.

**Highlights:** Relativistic velocity simulation, Space-time behavior visualization, Pedagogical tool, Master's dissertation project

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is e free?

e is free to download, with no in-app purchases.

### Is Relativistic Space free?

Relativistic Space is free to download, with no in-app purchases.

### Which has better reviews, e or Relativistic Space?

e is rated higher. e averages 5.0 out of 5 from 1 ratings, while Relativistic Space averages 3.7 from 3 ratings.

### Do e or Relativistic Space have ads?

Neither e nor Relativistic Space shows ads.

### Which is updated more often, e or Relativistic Space?

e ships an update every 11 months, and Relativistic Space every 75 months. Most recently, e was updated on November 6, 2026 and Relativistic Space on November 3, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*