# ca vs rhodopsin

The clearest difference is price: ca at $2.99 against rhodopsin's $9.99. ca also leads on iOS requirement (11.0 vs 15.0). rhodopsin's advantage is rating (5.0 vs 4.8) and review sentiment (100% vs 89%). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

ca costs $2.99 and rhodopsin $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

rhodopsin holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 52 and 25 respectively. Written reviews point the same way: 89% of ca's written reviews are positive against 100% of rhodopsin's.

ca ships an update monthly, rhodopsin every 2 months. The most recent releases landed on September 26, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | ca | rhodopsin |
| --- | --- | --- |
| Price | **$2.99** | $9.99 |
| Rating | [4.8 (52 ratings)](https://appshunter.io/ios/app/ca-mera-plus/id1616228106/reviews) | **[5.0 (25 ratings)](https://appshunter.io/ios/app/rhodopsin/id6471383189/reviews)** |
| Number of ratings | **52** | 25 |
| Positive reviews | 88.9% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Paid | Paid |
| Size | 2 MB | 292 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Fritz Menzer](https://appshunter.io/developer/512896637) | [Christopher Barth](https://appshunter.io/developer/1715210913) |

## What reviewers say

### ca

[App page](https://appshunter.io/ios/app/ca-mera-plus/id1616228106)

This app transforms your camera's live feed into unique, pixelated images and videos using cellular automata. Customize patterns with various color palettes, directions, rules, and resolutions for a retro aesthetic.

**Highlights:** Cellular automaton image interpretation, Pixelated output with unique patterns, Black and white or retro color palettes, Selfie and split camera modes, Video recording, Customizable automaton parameters

**Features:** Vision Pro support

**In-app purchases:** none


### rhodopsin

[App page](https://appshunter.io/ios/app/rhodopsin/id6471383189)

This app is a video synthesizer designed for live performances. It allows users to mix video sources and apply a series of three effects. Parameters for sources, mixers, and effects can be manipulated using LFOs, envelopes, and MIDI.

**Highlights:** Video source mixing, Three sequential effects, LFO and envelope control, MIDI parameter control, Live performance focused

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

**In-app purchases:** none


## Frequently asked questions

### Is ca free?

ca costs $2.99, with no in-app purchases.

### Is rhodopsin free?

rhodopsin costs $9.99, with no in-app purchases.

### Which has better reviews, ca or rhodopsin?

rhodopsin is rated higher. ca averages 4.8 out of 5 from 52 ratings, while rhodopsin averages 5.0 from 25 ratings.

### Do ca or rhodopsin have ads?

Neither ca nor rhodopsin shows ads.

### Which is updated more often, ca or rhodopsin?

ca ships an update monthly, and rhodopsin every 2 months. Most recently, ca was updated on September 26, 2026 and rhodopsin on September 21, 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.*