# OpEvol vs Zen Diagram

The clearest difference is in-app purchases: Zen Diagram at none against OpEvol's 1. Zen Diagram also leads on iOS requirement (14.4 vs 26.0). On price and device support there is nothing between them.

Both are free to download. OpEvol sells 1 in-app purchase, starting at $6.99 per year. Zen Diagram asks for nothing beyond the download.

## The numbers

| Metric | OpEvol | Zen Diagram |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 27.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | — |
| Update frequency | Every 22 months | — |
| Monetization | Paid | — |
| Size | 3 MB | 3 MB |
| Requires iOS | 26.0 | **14.4** |
| Devices | iPhone, iPad, Apple TV | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Muddlegeist](https://appshunter.io/developer/701677888) | [Dexter Buxton](https://appshunter.io/developer/1320181699) |

## What reviewers say

### OpEvol

[App page](https://appshunter.io/ios/app/opevol/id788355019)

Experience a dynamic, ever-changing display of psychedelic visuals inspired by 1960s Op Art. This app creates animated fields of geometric colors and contrasts for passive viewing or interactive play.

**Highlights:** Animated geometric patterns, Op Art inspired visuals, Psychedelic color displays, Interactive visual play, Air Display compatibility

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OpEvol Annual Subscription | $6.99 | per year |


### Zen Diagram

[App page](https://appshunter.io/ios/app/zen-diagram/id1577968753)

**In-app purchases:** none


## Frequently asked questions

### Is OpEvol free?

OpEvol is free to download, with in-app purchases available.

### Is Zen Diagram free?

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

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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.*