Woodulator vs PaSSBot
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Woodulator
This app offers advanced audio manipulation with analog-inspired delay and pitch shifting. It features versatile modulators, customizable filters, and extensive MIDI control for creative sound design. Presets can be saved and synced across devices via iCloud.
- Analog bucket brigade delay emulation
- Dual pitch shifters (up/down, harmonic, chorus)
- Versatile internal/external sidechain modulators
- Customizable delay line color and filters
- BPM sync and MIDI control
- Stereo width enhancement
- iCloud preset storage
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The Woodulator is a delay and pitch shifter inspired by analog bucket brigade delays. It also includes 2 versatile modulators. Pitch shifting is obtained by increasing or decreasing the clock in the delay line and not by FFT calculations. - Has 2 pitch shifters which can go up or down according to a harmonic scale or in chorus mode - Modulator source can be internal LFO or external side chain - Modulator destination can be pitch frequency, pitch amplitude, delay amplitude, panning, feedback amounts or Moog filter frequencies. - Modulation of pitch frequency can be up, down or both. - Delay line color can be set with LP/HP/BP/Moog filter and Saturation level. - Includes HP and LP filters on the input signal - Includes Moog filter on pitch out signals. - Pitch shifters have Reverse mode. - BPM can be set, tapped or synced by the DAW host. - LFO Square has slew-rate control. (control at 100% generates triangle waveform) - LFO’s have convenient beat/bar timing popup. - Delay and pitch signals can be panned L-R on a stereo bus/track. - Delay and pitch shifter timing can be synced to the bar or re-synced manually (playing live) - Stereo diff mode can create wide stereo from mono sources. - Presets can be stored in iCloud Drive (makes them available on all your devices). - Presets can be switched with Midi Program Changes. - Major controls can be set with Midi CC messages.
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.
- 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)
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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
Screenshots
Verdict
The clearest difference is price: Woodulator at $10.99 against PaSSBot's $34.99. Woodulator also leads on device support (3 vs 1) and iOS requirement (9.3 vs 11.0). On rating, review sentiment, ratings volume and update cadence 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
Woodulator costs $10.99 and PaSSBot $34.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Woodulator against 5.0 for PaSSBot. Both are backed by a comparable volume of ratings — 8 and 8 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 6, 2026 and October 5, 2026 respectively.
| Parameter | Woodulator | PaSSBot |
|---|---|---|
| Price | $10.99 — better | $34.99 |
| Rating | 5.0 (8 ratings) | 5.0 (8 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 8 | 8 |
| Update frequency | Every 4 months | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 9.3 — better | 11.0 |
| Further details — not scored | ||
| Size | 17 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Woodman's Immaculate Maple Syrup Studio | SonicPlanet Audio Video Teknolojileri Anonim Sti. |
Customer experience
Woodulator
PaSSBot
In-app purchases
Woodulator
No in-app purchases
PaSSBot
No in-app purchases
