# FormKey vs Anima Synthesizer

The clearest difference is price: FormKey at Free against Anima Synthesizer's $7.99. Anima Synthesizer's advantage is rating (5.0 vs 4.5) and in-app purchases (none vs 1). On ratings volume, ads, monetization model and device support there is nothing between them.

FormKey is free to download; Anima Synthesizer costs $7.99 up front. FormKey sells 1 one-off in-app purchase. Anima Synthesizer asks for nothing beyond the download.

Anima Synthesizer holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 8 and 3 respectively.

FormKey ships an update fortnightly, Anima Synthesizer every 6 days. The most recent releases landed on November 3, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | FormKey | Anima Synthesizer |
| --- | --- | --- |
| Price | **Free** | $7.99 |
| Rating | [4.5 (8 ratings)](https://appshunter.io/ios/app/formkey/id1535350561/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/anima-synthesizer/id6780281462/reviews)** |
| Number of ratings | **8** | 3 |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 6 days** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#198** |
| Size | 88 MB | 4 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Polyhedra](https://appshunter.io/developer/1535350563) | [Victorien Genna](https://appshunter.io/developer/6775279378) |

## What reviewers say

### 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 |


### Anima Synthesizer

[App page](https://appshunter.io/ios/app/anima-synthesizer/id6780281462)

**Currently charting:** #198 Top Paid · Music (US App Store)

This app is a physical modeling instrument that simulates how sound is produced in the real world. It offers intuitive controls for shaping sound through energy, object resonance, and room acoustics. It supports MPE controllers and offers a unique microtonal playing experience.

**Highlights:** Physical modeling sound engine, Intuitive ENERGY, OBJECT, ROOM controls, Modal resonator for object shaping, Morphable room acoustics simulation, MPE support with zero setup, Standalone and AUv3 instrument, Ribbon and piano keyboard options

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is FormKey free?

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

### Is Anima Synthesizer free?

Anima Synthesizer costs $7.99, with no in-app purchases.

### Which has better reviews, FormKey or Anima Synthesizer?

Anima Synthesizer is rated higher. FormKey averages 4.5 out of 5 from 8 ratings, while Anima Synthesizer averages 5.0 from 3 ratings.

### Do FormKey or Anima Synthesizer have ads?

Neither FormKey nor Anima Synthesizer shows ads.

### Which is updated more often, FormKey or Anima Synthesizer?

FormKey ships an update fortnightly, and Anima Synthesizer every 6 days. Most recently, FormKey was updated on November 3, 2026 and Anima Synthesizer on November 10, 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.*