iVoxel vs Agonizer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iVoxel
This app transforms your voice into a singing machine using a powerful vocoder and synthesizer. It allows real-time voice manipulation, pitch correction, and the creation of unique vocal effects from recorded speech.
- Real-time voice analysis and resynthesis
- 20+2 Channel vocoder
- Pitch follower and automatic tuning
- Voice spectrum recorder (voxels)
- Included prerecorded voxels
- Live keyboard playback of vocoded voice
- Polyphonic synthesizer with analog waves
Read full descriptionHide full description
iVoxel is not only an amazingly sounding vocoder - the unique concept of iVoxel turns this vocoder into a singing machine. iVoxel is a combination of a voice optimized synthesizer and a vocoder. The vocoder part is based on the Matrix vocoder from VirSyn used by many famous artists - one of them the well known german group Kraftwerk. The channel filters used by iVoxel are based on the Sennheiser Vocoder VSM201 resulting in a rich and fat analogue sound characteristic. The pitch follower and automatic tuning let you sing correct to a selectable scale. You can use iVoxel in many different ways: As a realtime vocoder talking into the microphone while playing tunes on the keyboard. The sound character of your voice can be changed in many different aspects like pitch, gender or breath noise. Use it to sing over your favorite iTunes song ! Record the analyzed spectrum of phrases and words from your own voice. Then use this voxel to play with your own voice on the keyboard or with the build in sequencer. Nearly 300 hundred prerecorded voxels are already included. iVoxel is Audiobus compatible and can be used in the Input, Filter and Output slots in the Audiobus signal chain. The carrier signal and the vocal signal can now be fed by any Audiobus compatible Apps. The output of your creations can be recorded to an audio file which you can use with other Apps and programs for further processing. Features: • Realtime analysis/resynthesis of your voice • 20+2 Channel vocoder • Pitch Follower and automatic tuning correction to selectable scale • Realtime pitch to MIDI Note converter • Voice spectrum recorder (voxels) • Nearly 300 prerecorded voxels included • Play your vocoded voice live on keyboard. Drag for slides and vibrato. • Polyphonic sequencer for notes & lyrics • Voice optimized polyphonic synthesizer with up to 64 analog waves • Time warping of voxels • Gender changer • Breath noise • Pitch vibrato with delay • Hi-end Reverb and Chorus/Delay effects • Export/Import of projects and voxels • Export of audio recordings • Upload recordings to SoundCloud • Copy audio recordings to Clipboard • Virtual MIDI and Background audio • flexible MIDI control for Gender and Vibrato • compatible to Korg/WIST standard • CoreMIDI • Audiobus 2 support (Input/Filter/Output) with state saving (requires iOS 7 or newer)
Agonizer
This app is a monophonic synthesizer focused on bass sounds, developed with a synth bass expert. It features dual wavetable oscillators, a mangle section, and built-in stereo effects. It supports MPE controllers and various audio/MIDI connectivity options for standalone or app-to-app use.
- Monophonic synth engine for bass
- Dual wavetable oscillators
- Built-in stereo effects
- MPE controller support
- Standalone and AUv3 operation
- 140+ factory presets
Read full descriptionHide full description
Agonizer is a monophonic synthesizer designed in collaboration with YouTuber and synth bass expert Jakob Haq of haQ attaQ Overview: * Monophonic Synth Engine with focus on Bass * Built-in stereo effects * 140+ fine tuned factory presets designed by Jakob Haq * Supports ROLI Seaboard and other MPE controllers out of the box * Standalone operation with support for USB audio interfaces, wired, network & bluetooth MIDI * Audio Unit v3 Extension * Inter App Audio support * Audiobus support * Ableton Link Synth Voice: * Dual Wavetable Oscillators with 40+ Wavetables, Morphing & X-Mod * Dedicated sub osc & noise source * Mangle Section with pre-filter Drive, Bitcrush, Lift and Push controls * VA Ladder filter * Wobulator (Highly tweak-able Sequenced LFO) * LFO with Key and BPM Sync * Variable Slope AD & ADSR Envelopes * Tube based master drive Effects: * 2x stereo effect units * Vintage Chorus * Digital Delay Presets: * Factory bank including 140+ presets designed by Jakob Haq * Preset Management with Templates & Categories * Shared User Presets between Standalone and AUv3 versions * Preset Export & Import Connectivity: * Standalone * AUv3 Instrument * Inter-App Audio Instrument * Audiobus Instrument Requirements: * iOS12+ * iPad Air 2 or newer
Screenshots
Verdict
The clearest difference is price: iVoxel at $6.99 against Agonizer's $19.99. iVoxel also leads on in-app purchases (none vs 3). Agonizer's advantage is rating (4.8 vs 3.3) and review sentiment (79% vs 55%). On update cadence, ads, device support and iOS requirement 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
iVoxel costs $6.99 and Agonizer $19.99 up front. Agonizer sells 3 one-off in-app purchases. iVoxel asks for nothing beyond the download.
Agonizer holds the better App Store score, 4.8 against 3.3. That said, the two scores are not equally well evidenced: Agonizer has 203 ratings behind it against 17, so its average is the more settled of the two. Written reviews point the same way: 55% of iVoxel's written reviews are positive against 79% of Agonizer's.
Both ship on a similar rhythm, roughly every 5 months. The most recent releases landed on September 25, 2026 and September 22, 2026 respectively.
| Parameter | iVoxel | Agonizer |
|---|---|---|
| Price | $6.99 — better | $19.99 |
| Rating | 3.3 (17 ratings) | 4.8 (203 ratings) — better |
| Positive reviews | 54.9% of reviews | 78.8% of reviews — better |
| Number of ratings | 17 | 203 — better |
| Update frequency | Every 5 months | Every 5 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 46 MB | 362 MB |
| Age rating | 4+ | 4+ |
| Developer | Harry Gohs | Kai Aras |
Customer experience
iVoxel
Agonizer
User reviews
iVoxel
From 17 App Store ratingsWhat we love
- 🎵 Excellent sound quality and vocoder capabilities
- 💡 Innovative vocal sound design tool with unique spectral shaping
- 🎹 Versatile instrument for creating robot/Kraftwerk-style vocals
- 👍 Intuitive once users understand the interface
- 🎧 Works well with built-in microphone for live vocoding
Room to improve
- 🐛 Frequent crashes and stability issues across iOS versions
- ❌ Poor documentation and unclear user interface
- 🔇 Volume levels inconsistent - too quiet or too loud
- ⚠️ Unreliable audio input/output routing
- 🚫 Limited microphone compatibility and connection issues
Agonizer
From 203 App Store ratingsWhat we love
- 🎵 Excellent sound quality and unique bass tones
- 🎨 Intuitive and well-designed user interface
- ⚙️ Powerful modulation and sound design capabilities
- 🎛️ Wobulator feature for creative bass manipulation
- 📦 Great presets included with the app
Room to improve
- 🐛 Keyboard legato/mono-synth behavior inconsistent
- 🐛 Frequent crashes in host applications (AUM, Cubasis, Audiobus)
- 🐛 No sound output in GarageBand and some AU hosts
- 🐛 App freezes on splash screen with iOS 18.3
- 🐛 UI responsiveness issues and knob lag
Bugs and requests
iVoxel
Reported bugs
14 issues- App crashes on launch or during use
- Hangs when changing presets or settings
- Random background noise and clicking sounds
- Microphone input not recognized or working intermittently
- No sound output in standalone or Audiobus mode
Show 9 moreShow fewer
- Touch controls unresponsive in certain screen areas
- Import/export functionality broken
- Sequencer not playing sounds or producing audio
- Recording functionality causes crashes
- Compatibility issues with iOS 18, iOS 17, and older versions
- Audiobus carrier wave option not appearing
- MIDI stuck notes and keyboard responsiveness issues
- Display rendering issues on certain devices
- Audio routing not working with external interfaces
Requested features
14 requests- AU v3 plugin support for modern DAW integration
- Audiobus 3 and IAA (Inter-App Audio) support
- Core MIDI support beyond Akai controllers
- Lightning to USB audio interface compatibility
- Custom word/text input for voice synthesis
Show 9 moreShow fewer
- Metronome for sequencer alignment
- Direct audio export and playback within app
- Improved sequencer with copy/paste/undo functionality
- Bluetooth audio output support
- Sync options for modern music production
- Better microphone input handling
- Volume normalization and better level controls
- Ability to delete recorded voxels
- More comprehensive tutorial and help system
Agonizer
Reported bugs
16 issues- Keyboard does not properly handle legato/mono-synth note priority
- Crashes in Audiobus, AUM, and Cubasis host applications
- No sound output when used as AUv3 plugin in hosts
- No sound in GarageBand integration
- App freezes on splash screen with iOS 18.3
Show 11 moreShow fewer
- Stuck notes and failed note triggering
- Scream button malfunction when switching presets
- Cutoff knob lag in AUv3 scenarios
- UI jitter and text cutoff on iPhone
- Favorite preset feature not working on iPhone
- Program change not working properly in hosts
- Always opens with init preset in host applications
- Modulation matrix sensitivity too high (2% movement = large range)
- Audio output peaks in red with no sound
- Permanent clipping/damaged audio output
- Misleading IAP pricing display (showing 'FREE' for paid content)
Requested features
10 requests- Polyphony mode or toggle between mono and poly
- Envelope drawing capability instead of preset selection
- Menu-based waveform selection instead of cycling
- Arpeggiator function
- Preset browser search and favorites filter
Show 5 moreShow fewer
- Extended automation control for all knobs
- Keytracking for filter
- Reverb effect
- Accelerometer/gyroscopic velocity sensitivity
- Customizable number of keyboard keys
In-app purchases
iVoxel
No in-app purchases
Agonizer
- Chrome Oasis Pack$3.99
- Circuit Bender Pack$3.99
- Neon Nightmare Pack$4.99









