# Optogenetics vs Ethr Preview

The clearest difference is iOS requirement: Ethr Preview at 15.1 against Optogenetics's 17.0. On price, ads, in-app purchases and device support there is nothing between them.

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

## The numbers

| Metric | Optogenetics | Ethr Preview |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | — |
| Size | 365 MB | 63 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Popneuron Ltd.](https://appshunter.io/developer/569968720) | [VentureDive](https://appshunter.io/developer/439880351) |

## What reviewers say

### Optogenetics

[App page](https://appshunter.io/ios/app/optogenetics/id570438151)

**Features:** macOS Compatibility

**In-app purchases:** none


### Ethr Preview

[App page](https://appshunter.io/ios/app/ethr-preview/id6742777779)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Optogenetics free?

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

### Is Ethr Preview free?

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

### Do Optogenetics or Ethr Preview have ads?

Neither Optogenetics nor Ethr Preview shows ads.

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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.*