Comparison

PaSSBot vs Serene Whisper

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

PaSSBot

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)
Read full description

PaSSBot is a unique stochastic filter bank audio processor. The desktop VST/AU version of PaSSbot has already arrived in February 2020 and this iOS version is equivalent to the latest version 2.1. PaSSBot filter types are Biquad, StateVariableFilter, Ladder, SEM and Resonators. With behaviors of bandpass, Lo + Hipass, Notch and up to 64 of them in true stereo ! The user can set values of center frequency, gain and resonance of the each filter, which will be then eloborated with powerful stochastic generators ( 4 independent GENs for each filter ) with continuous or discrete probabilistic distributions but also with standard waveforms. One can set each filter parameters individually, but also distribute them in harmonic order, again the harmonic spread ratio can be set by the user or even can be modulated by a GEN. Precision DSP rendering, less than 1milisec. control rate precision. The filters can run continuously or be triggered manually. In that case, each filter will be applied an independent AR envelope with configurable random duration. Important notes : - A recent iPAD model is being recommended and also setting the host buffer size to 128 or higher greatly helps to the CPU needs which also heavily depends on the number of parallel filters being used. - The resonators can be sensitive to input signal level. - The PaSSBot manual can be found at this link. https://www.sonic-lab.com/PaSSBot_files/PassBot_manual.pdf sonicLAB PaSSBot youtube playlist : https://www.youtube.com/playlist?list=PLP0cOkraQHDYUoMG6BETTN1eGm-Kq5z0T

About

Serene Whisper

Features
Read full description

In a world full of noise, finding a moment of peace can be challenging. Serene Whisper, the white noise app designed just for you, takes you to a tranquil realm, helping you find a slice of calm amidst the chaos of daily life. Key Features: Variety of White Noises: From rain and wind to ocean waves, immerse yourself in the soothing sounds of nature anytime, anywhere. High-Quality Sound: Each sound is meticulously crafted to provide the most authentic auditory experience. Personalized Settings: Mix and match different sounds to create your own unique relaxation soundtrack. Timer Function: Set it to turn off automatically, so you don't have to worry about battery drain after you fall asleep. Offline Mode: Enjoy peaceful moments even without an internet connection. Whether you're working, studying, or resting, Serene Whisper is your perfect companion. Download Serene Whisper and make tranquility a part of your daily routine.

Screenshots

Serene Whisper4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

PaSSBot ships an update every 4 months, Serene Whisper every 10 days. The most recent releases landed on October 23, 2026 and October 15, 2026 respectively.

Scorecard5 real differences · 5 level
PaSSBot versus Serene Whisper: the parameters behind the verdict, then further details
ParameterPaSSBotSerene Whisper
Price$34.99Free — better
Rating5.0 (8 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings8 — better—
Update frequencyEvery 4 monthsEvery 10 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid—
DevicesiPadiPhone, iPad, iPod — better
Requires iOS11.0 — better17.0
Further details — not scored
Size11 MB59 MB
Age rating4+4+
DeveloperSonicPlanet Audio Video Teknolojileri Anonim Sti.博 彭

In-app purchases

None

PaSSBot

No in-app purchases

1 purchases

Serene Whisper

One-time1
  • Lifetime Pro user$1.99

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 15, 2026.

Other comparisons