shapesynth vs IAP Control
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
shapesynth
Create unique retro-inspired sounds by drawing oscillator waveforms. This polyphonic synthesizer offers extensive modulation options, built-in effects, and recording capabilities. Seamlessly integrate with other music apps and hardware for a versatile creative experience.
- Draw custom oscillator waveforms
- 16-voice polyphony
- Arpeggiator and stereo delay
- Resonant filter
- Parameter modulation via keyboard, MPE, accelerometer
- Tape recorder with infinite overdubs
- Inter-app audio and AUv3 support
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Shape is a polyphonic synthesiser allowing the user to draw the shape of the oscillator waveform. The first half of the oscillator is represented by 32 blocks and the second half is its mirror, generating all sorts of possible raw retroish sounds. 16 pages per oscillator allows to interpolate between different shapes. Add effects like arpeggio, stereo delay and a resonant filter and record your sounds on a classic tape. Modulate any parameter with keyboard, MIDI MPE or the device accelerometer. Connect to other apps with AudioBus, IAA, AUv3 and midi. +++ 16 voice polyphony +++ 2 oscillators, draw your own shape +++ 3 oscillator mixing functions (add, subtract or multiply) +++ Lfo modulation with ADSR: envelope, pitch, duty cycle, square, page or filter +++ Record on tape with infinite overdubs (save, load, import, export) +++ Arpeggiator +++ Stereo delay +++ Resonant filter (low, band and high pass) +++ Modulate any parameter using keyboard, MIDI MPE or accelerometer (Built in or Sphero) +++ Mini linear sequencer with euclidean rhythm +++ On screen 25 key stylophone style keyboard +++ AudioBus, Inter App Audio and AUv3 +++ Ableton link or AUv3 host sync +++ CoreMIDI, IAA MIDI, Bluetooth MIDI, limited MPE and MIDI out +++ Audio Paste, files app drag’n drop or open with
IAP Control
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Illusonic Audio Processor (IAP) is like a Swiss Army Knife for audiophiles. It optimizes almost any sound system, room, and listening situation. IAP Control app allows network-based remote control of IAP. Power On/Off, Input, Volume, and Presets can be set. All detail parameters of the presets can be controlled as well.
Screenshots
Verdict
The clearest difference is price: IAP Control at Free against shapesynth's $4.99. shapesynth's advantage is update cadence (every 2 months vs every 9 months) and iOS requirement (9.0 vs 12.0). On ads, in-app purchases and device support 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
IAP Control is free to download; shapesynth costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
shapesynth ships an update every 2 months, IAP Control every 9 months. The most recent releases landed on November 1, 2026 and October 26, 2026 respectively.
| Parameter | shapesynth | IAP Control |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 4.9 (24 ratings) — better | — |
| Positive reviews | 65.1% of reviews | — |
| Number of ratings | 24 — better | — |
| Update frequency | Every 2 months — better | Every 9 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 8 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Erik Sigth | Illusonic GmbH |
In-app purchases
shapesynth
No in-app purchases
IAP Control
No in-app purchases









