# PaSSBot vs Serene Whisper

The clearest difference is price: Serene Whisper at Free against PaSSBot's $34.99. Serene Whisper also leads on update cadence (every 10 days vs every 4 months) and device support (3 vs 1). PaSSBot's advantage is in-app purchases (none vs 1) and iOS requirement (11.0 vs 17.0). On ads there is nothing between them.

Serene Whisper is free to download; PaSSBot costs $34.99 up front. Serene Whisper sells 1 one-off in-app purchase. PaSSBot asks for nothing beyond the download.

PaSSBot ships an update every 4 months, Serene Whisper every 10 days. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | PaSSBot | Serene Whisper |
| --- | --- | --- |
| Price | $34.99 | **Free** |
| Rating | **[5.0 (8 ratings)](https://appshunter.io/ios/app/passbot/id1557720096/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 10 days** |
| Monetization | Paid | — |
| Size | 11 MB | 59 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SonicPlanet Audio Video Teknolojileri Anonim Sti.](https://appshunter.io/developer/946568989) | [博 彭](https://appshunter.io/developer/1293268076) |

## What reviewers say

### 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


### Serene Whisper

[App page](https://appshunter.io/ios/app/serene-whisper/id6503193688)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Pro user | $1.99 | one-time |


## Frequently asked questions

### Is PaSSBot free?

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

### Is Serene Whisper free?

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

### Do PaSSBot or Serene Whisper have ads?

Neither PaSSBot nor Serene Whisper shows ads.

### Which is updated more often, PaSSBot or Serene Whisper?

PaSSBot ships an update every 4 months, and Serene Whisper every 10 days. Most recently, PaSSBot was updated on October 23, 2026 and Serene Whisper on October 24, 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.*