Agonizer vs VOSIS Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
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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
VOSIS Pro
Transform images into unique sounds and compose visual music. This tool offers advanced filters and MIDI control for experimental sound design and creative audio manipulation.
- Image to sound conversion
- Advanced image filters
- MIDI keyboard support
- Customizable presets
- Unlimited recording
- Video file loading (iPad/Desktop)
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VOSIS is a synthesizer combining audification of greyscale pixel data with several image filters. It is a tool for image sonification, visual music composition, and experimental sound design. The audification of pixel luminance values creates shape-timbre relationships. Pixel scan rate is controlled in terms of note interval, octave, and scale to give varying pitch between image regions. The ADSR envelope allows one to play images as a non-linear sequence of pitches with varying wavetable/timbre. VOSIS Pro adds several features to VOSIS useful for sound designers and musicians: Save and load custom presets, connect a MIDI keyboard and play regions with keys, map any control and region positions to MIDI CC, unlimited recording and screen mirroring with no watermark, downsampling/blur/sharpen, and tremolo filters, subdivide large regions into step sequence mode, load video files (iPad and Desktop versions only). Visit vosis.app for sound example, demo videos, and user guide!
Screenshots
Verdict
The clearest difference is price: VOSIS Pro at $7.99 against Agonizer's $19.99. VOSIS Pro also leads on in-app purchases (none vs 3) and update cadence (every 3 months vs every 5 months). Agonizer's advantage is ratings volume (203 vs 7) and rating (4.8 vs 4.6). On ads 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
Agonizer costs $19.99 and VOSIS Pro $7.99 up front. Agonizer sells 3 one-off in-app purchases. VOSIS Pro asks for nothing beyond the download.
Agonizer holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Agonizer has 203 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 78% of Agonizer's written reviews are positive against 67% of VOSIS Pro's.
Agonizer ships an update every 5 months, VOSIS Pro every 3 months. The most recent releases landed on October 14, 2026 and October 9, 2026 respectively.
| Parameter | Agonizer | VOSIS Pro |
|---|---|---|
| Price | $19.99 | $7.99 — better |
| Rating | 4.8 (203 ratings) — better | 4.6 (7 ratings) |
| Positive reviews | 77.8% of reviews — better | 66.7% of reviews |
| Number of ratings | 203 — better | 7 |
| Update frequency | Every 5 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 11.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 362 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Kai Aras | Life Orange LLC |
Customer experience
Agonizer
VOSIS Pro
Bugs and requests
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
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- 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
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- Extended automation control for all knobs
- Keytracking for filter
- Reverb effect
- Accelerometer/gyroscopic velocity sensitivity
- Customizable number of keyboard keys
VOSIS Pro
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Agonizer
- Chrome Oasis Pack$3.99
- Circuit Bender Pack$3.99
- Neon Nightmare Pack$4.99
VOSIS Pro
No in-app purchases









