# GrainProc vs PaSSBot

The clearest difference is price: GrainProc at $2.99 against PaSSBot's $34.99. PaSSBot's advantage is rating (5.0 vs 4.2) and review sentiment (100% vs 60%). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

GrainProc costs $2.99 and PaSSBot $34.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PaSSBot holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 18 and 8 respectively. Written reviews point the same way: 60% of GrainProc's written reviews are positive against 100% of PaSSBot's.

GrainProc ships an update every 2 months, PaSSBot every 4 months. Both last shipped on October 23, 2026.

## The numbers

| Metric | GrainProc | PaSSBot |
| --- | --- | --- |
| Price | **$2.99** | $34.99 |
| Rating | [4.2 (18 ratings)](https://appshunter.io/ios/app/grainproc-granular-synthesis/id572380905/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/passbot/id1557720096/reviews)** |
| Number of ratings | **18** | 8 |
| Positive reviews | 60.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | Paid | Paid |
| Size | 6 MB | 11 MB |
| Requires iOS | 16.0 | **11.0** |
| Devices | **iPhone, iPad** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mayank Sanganeria](https://appshunter.io/developer/527550366) | [SonicPlanet Audio Video Teknolojileri Anonim Sti.](https://appshunter.io/developer/946568989) |

## What reviewers say

### GrainProc

[App page](https://appshunter.io/ios/app/grainproc-granular-synthesis/id572380905)

Create unique sounds and musical textures in real-time by processing external audio. This app features two parallel granular engines for layering sounds, offering a versatile tool for musicians and sound designers.

**Highlights:** Real-time granular synthesis, Two parallel grain engines, AudioBus input support, Waveform sound source manipulation, Control over volume, feedback, and density, Visual level monitoring

**Features:** macOS Compatibility

**In-app purchases:** none


### PaSSBot

[App page](https://appshunter.io/ios/app/passbot/id1557720096)

This app is a stochastic filter bank audio processor for iPad, offering advanced sound manipulation with various filter types and powerful stochastic generators. It allows for precise control over filter parameters and harmonic distribution, ideal for creating complex audio textures.

**Highlights:** Stochastic filter bank audio processor, Multiple filter types (Biquad, Ladder, SEM, Resonators), Up to 64 filters in stereo, Powerful stochastic generators, Individual filter parameter control, Harmonic distribution options, Precision DSP rendering (<1ms control rate)

**In-app purchases:** none


## Frequently asked questions

### Is GrainProc free?

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

### Is PaSSBot free?

PaSSBot costs $34.99, with no in-app purchases.

### Which has better reviews, GrainProc or PaSSBot?

PaSSBot is rated higher. GrainProc averages 4.2 out of 5 from 18 ratings, while PaSSBot averages 5.0 from 8 ratings.

### Do GrainProc or PaSSBot have ads?

Neither GrainProc nor PaSSBot shows ads.

### Which is updated more often, GrainProc or PaSSBot?

GrainProc ships an update every 2 months, and PaSSBot every 4 months. Most recently, GrainProc was updated on October 23, 2026 and PaSSBot on October 23, 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.*