# equivalence principle vs Time Dilation Explorer Lab

The clearest difference is in-app purchases: equivalence principle at none against Time Dilation Explorer Lab's 1. equivalence principle also leads on ads (none vs shown) and iOS requirement (16.0 vs 26.2). On price and device support there is nothing between them.

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

## The numbers

| Metric | equivalence principle | Time Dilation Explorer Lab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Size | 0 MB | 16 MB |
| Requires iOS | **16.0** | 26.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sungjun Kim](https://appshunter.io/developer/1602461985) | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) |

## What reviewers say

### equivalence principle

[App page](https://appshunter.io/ios/app/equivalence-principle/id6670335382)

**Features:** macOS Compatibility

**In-app purchases:** none


### Time Dilation Explorer Lab

[App page](https://appshunter.io/ios/app/time-dilation-explorer-lab/id6773199521)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Features | $2.99 | one-time |


## Frequently asked questions

### Is equivalence principle free?

equivalence principle 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 equivalence principle or Time Dilation Explorer Lab have ads?

Time Dilation Explorer Lab shows ads; equivalence principle does not.

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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.*