# iDensity vs FRMS

The clearest difference is in-app purchases: iDensity at none against FRMS's 16. iDensity also leads on update cadence (monthly vs every 2 months). FRMS's advantage is ratings volume (284 vs 48) and price ($8.99 vs $9.99). On rating, review sentiment, ads and device support there is nothing between them.

iDensity costs $9.99 and FRMS $8.99 up front. FRMS sells 16 one-off in-app purchases. iDensity asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for iDensity against 4.8 for FRMS. That said, the two scores are not equally well evidenced: FRMS has 284 ratings behind it against 48, so its average is the more settled of the two. Written reviews are what separate them: 86% of iDensity's written reviews are positive against 85% of FRMS's.

iDensity ships an update monthly, FRMS every 2 months. The most recent releases landed on October 21, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | iDensity | FRMS |
| --- | --- | --- |
| Price | $9.99 | **$8.99** |
| Rating | **[4.9 (48 ratings)](https://appshunter.io/ios/app/idensity/id464660779/reviews)** | [4.8 (284 ratings)](https://appshunter.io/ios/app/frms-granular-synthesizer/id1381392223/reviews) |
| Number of ratings | 48 | **284** |
| Positive reviews | **86.1% of reviews** | 84.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 17 MB | 267 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [apeSoft](https://appshunter.io/developer/464660782) | [Imaginando Lda](https://appshunter.io/developer/895445015) |

## What reviewers say

### iDensity

[App page](https://appshunter.io/ios/app/idensity/id464660779)

This app offers real-time asynchronous sound file granulation, enabling users to create a wide array of audio effects. It provides tools for time/pitch manipulation, texture generation, buffer recording, and complex sound exploration. Designed for musicians and sound designers, it offers flexibility for live performance, studio composition, and on-the-go sound design.

**Highlights:** Real-time sound granulation, Time/pitch shifting and jittering, Texture generation, Buffer recording and manipulation, Scrub pad exploration, Dynamic envelope shaping, Audio Unit (AUv3) support

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

**In-app purchases:** none

**What reviewers like**

- ✨ Incredible soundscapes
- 🎛️ Powerful granular synthesis
- 🎚️ Multi-channel capability (6 channels)
- 🎧 Excellent for ambient music
- 💡 Innovative sound design tool

**What reviewers complain about**

- 🤔 Steep learning curve
- 🎨 Unappealing UI/color schemes (for some)
- 🎛️ Counterintuitive controls (for some)
- 💰 In-app purchases can be costly
- ❓ Lack of clear documentation/tutorials (historically)

**Reported bugs**

- Occasional crashes (historically)
- AudioBus issues (historically)
- Preset management not working correctly (historically)
- Transport sync not working (historically)
- GUI bugs (e.g., maximizing a strand)

**Requested features**

- Independent MIDI note control over pitch for each stream
- Alphabetical preset sorting
- Load existing project name into 'Save As'
- Multi-port output for AUM/Ape Matrix
- Built-in wave-editor for sample cutting


### FRMS

[App page](https://appshunter.io/ios/app/frms-granular-synthesizer/id1381392223)

This app offers a powerful and flexible layering system for creating unique audio experiences. It blends multiple synthesis types, allowing users to craft everything from ambient soundscapes to glitchy textures. Import your own sounds or use the curated library for endless sonic exploration.

**Highlights:** 4 Synthesis Engines per voice, FM Modes & Operator Stacking, Real-Time Granulation, Deep Modulation & Envelope Control, Advanced FX & Polyphony, MPE Compatibility

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

**In-app purchases (16)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fragmented Chants | $5.99 | one-time |
| Euphoria Preset Pack | $6.49 | one-time |
| Ghost Signals Preset Pack | $7.99 | one-time |
| Supremeja Music Preset Pack | $8.99 | one-time |
| Sounds Of Saxophone | $8.99 | one-time |
| Glitches From The Heart | $8.99 | one-time |
| Sounds Of Guitar Preset Pack | $8.99 | one-time |
| Antique Shop Preset Pack | $8.99 | one-time |
| Sounds Of Clarinet Preset Pack | $8.99 | one-time |
| Sounds Of Bassoon Preset Pack | $8.99 | one-time |
| Sounds Of Foley 1 | $8.99 | one-time |
| Scratching The Surface 1 | $8.99 | one-time |
| Sounds Of Saxophone 2 Pack | $8.99 | one-time |
| Aural Alchemy 2 - Collector Edition | $11.99 | one-time |
| The Book Of Genesis | $11.99 | one-time |
| Aural Alchemy | $11.99 | one-time |

**What reviewers like**

- 🎨 Fantastic sound design
- 👍 Intuitive and well-designed interface
- 🎶 Inspiring and creative sound possibilities
- 💻 Works great on iPad and desktop
- 🔑 Excellent preset packs

**What reviewers complain about**

- 🔋 CPU-intensive, can cause performance issues
- 🔇 Bluetooth connectivity problems
- 💰 Expensive in-app purchases

**Reported bugs**

- Crashes and audio glitches in certain DAW environments
- Issues with sample playback and freezing

**Requested features**

- Ability to import larger sample files
- More granular control over modulation parameters
- Undo/redo functionality
- Improved MIDI integration and learn capabilities


## Frequently asked questions

### Is iDensity free?

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

### Is FRMS free?

FRMS costs $8.99, and also offers in-app purchases.

### Which has better reviews, iDensity or FRMS?

iDensity is rated higher. iDensity averages 4.9 out of 5 from 48 ratings, while FRMS averages 4.8 from 284 ratings.

### Do iDensity or FRMS have ads?

Neither iDensity nor FRMS shows ads.

### Which is updated more often, iDensity or FRMS?

iDensity ships an update monthly, and FRMS every 2 months. Most recently, iDensity was updated on October 21, 2026 and FRMS on October 26, 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.*