# RF vs FormKey

The clearest difference is price: FormKey at Free against RF's $5.99. FormKey also leads on update cadence (fortnightly vs every 8 months). RF's advantage is in-app purchases (none vs 1) and review sentiment (67% vs 57%). On rating, ratings volume, ads and monetization model there is nothing between them.

FormKey is free to download; RF costs $5.99 up front. FormKey sells 1 one-off in-app purchase. RF asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for RF against 4.5 for FormKey. Both are backed by a comparable volume of ratings — 12 and 8 respectively. Written reviews are what separate them: 67% of RF's written reviews are positive against 57% of FormKey's.

RF ships an update every 8 months, FormKey fortnightly. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | RF | FormKey |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[4.6 (12 ratings)](https://appshunter.io/ios/app/rf-1-reverb/id1097763239/reviews)** | [4.5 (8 ratings)](https://appshunter.io/ios/app/formkey/id1535350561/reviews) |
| Number of ratings | **12** | 8 |
| Positive reviews | **66.7% of reviews** | 57.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Fortnightly** |
| Monetization | Paid | Paid |
| Size | 15 MB | 88 MB |
| Requires iOS | **9.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kai Aras](https://appshunter.io/developer/370820899) | [Polyhedra](https://appshunter.io/developer/1535350563) |

## What reviewers say

### RF

[App page](https://appshunter.io/ios/app/rf-1-reverb/id1097763239)

This app offers a versatile collection of algorithmic reverbs for creating diverse soundscapes, from intimate rooms to expansive modulated spaces. It features multiple reverb programs, extensive tweakable controls, and seamless integration with various audio hosts and interfaces.

**Highlights:** Multiple reverb programs, Continuously variable size, Variable pre-delay, Diffusion and damping controls, Modulation section, AudioUnitV3, Inter-App Audio, Audiobus support

**Features:** Vision Pro support

**In-app purchases:** none


### FormKey

[App page](https://appshunter.io/ios/app/formkey/id1535350561)

This app is an intuitive MIDI controller that helps musicians improve by using shapes for notes and colors for octaves. Its unique isomorphic keys aid in pattern recognition and chord discovery, making music creation more accessible.

**Highlights:** Shape-based note input, Color-coded octaves, Isomorphic key layout, Pattern recognition aid, Chord discovery assistance, Future update commitment

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FormKey Full Unlock | $14.99 | one-time |


## Frequently asked questions

### Is RF free?

RF costs $5.99, with no in-app purchases.

### Is FormKey free?

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

### Which has better reviews, RF or FormKey?

RF is rated higher. RF averages 4.6 out of 5 from 12 ratings, while FormKey averages 4.5 from 8 ratings.

### Do RF or FormKey have ads?

Neither RF nor FormKey shows ads.

### Which is updated more often, RF or FormKey?

RF ships an update every 8 months, and FormKey fortnightly. Most recently, RF was updated on November 6, 2026 and FormKey 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.*