Phosphor 3 vs Agonizer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Phosphor 3
This app recreates a vintage digital synthesizer, offering a faithful emulation of a classic sound engine. It includes modern features like MPE, extensive modulation, and a new UI for sonic exploration.
- Vintage digital synthesizer emulation
- Additive synthesis engine
- MPE support
- Extensive modulation routing
- Preset manager
- Tuning tables
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Glow in the dark synthesis. Phosphor 3 is a dual-oscillator additive synthesizer that puts the raw building blocks of sound at your fingertips. Draw, randomize, or select up to 64 harmonics per oscillator, then shape them with envelopes, LFOs, cross-modulation, and a flexible mod matrix. Originally inspired by the alphaSyntauri, a rare digital additive synth from the early 1980s, Phosphor 3 takes that concept far beyond its origins with modern MPE expression, polyphonic modulation, and a full effects engine. --- Additive Oscillators Two identical additive oscillators, each with up to 64 individually editable harmonics. Start from classic shapes: sawtooth, triangle, square, or draw your own harmonic spectrum directly in the partial editor. The intelligent randomizer generates musically useful timbres with variable rolloff, density, and formant peaks, so every click produces something worth exploring. Choose 16, 32, or 64 partials per oscillator to balance complexity against CPU. Each oscillator has independent level, pan, transpose, fine tune, a noise generator with lo-fi downsampling, and cross-modulation (FM) for pushing timbres into harsher, more complex territory. Modulation Two ADSR envelopes with adjustable attack, decay, and release curves. Two LFOs with four waveforms (pulse, sine, saw, random), tempo sync, and the option to run polyphonically, a separate LFO per voice, or globally. An 8-source modulation matrix routes velocity, pressure, pitch bend, mod wheel, CC 74, triggered random, and both LFOs to destinations across the oscillators and effects. Effects Stereo delay with independent left/right time, feedback, and cross-channel feedback for ping-pong and rhythmic patterns. Tempo sync locks delay times to your DAW. Dual band-pass filters after the delay let you carve the wet signal into resonant, frequency-specific textures. Expression Full MPE support with per-note pitch bend, pressure, and slide across 16 polyphonic voices. Mono legato and mono retrigger modes with adjustable portamento. Unison mode for thick, detuned stacks. A scrollable 128-key on-screen keyboard with velocity from touch position, pitch bend from horizontal drag, and channel pressure from vertical drag, no hardware controller required. Tuning MTS-ESP client support for real-time microtuning from any MTS-ESP master. TUN file import for custom scales. Standard 12-TET with adjustable A4 reference. Supports AUv3 for use in GarageBand, AUM, Cubasis, and other AUv3-compatible hosts.
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
Screenshots
Verdict
The clearest difference is price: Phosphor 3 at $5.99 against Agonizer's $19.99. Phosphor 3 also leads on in-app purchases (none vs 3). Agonizer's advantage is ratings volume (203 vs 9) and update cadence (every 5 months vs every 11 months). On rating, review sentiment, ads 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
Phosphor 3 costs $5.99 and Agonizer $19.99 up front. Agonizer sells 3 one-off in-app purchases. Phosphor 3 asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.7 for Phosphor 3 against 4.8 for Agonizer. That said, the two scores are not equally well evidenced: Agonizer has 203 ratings behind it against 9, so its average is the more settled of the two. Written reviews split almost evenly too, at 79% and 79% positive.
Phosphor 3 ships an update every 11 months, Agonizer every 5 months. The most recent releases landed on July 6, 2026 and September 22, 2026 respectively.
| Parameter | Phosphor 3 | Agonizer |
|---|---|---|
| Price | $5.99 — better | $19.99 |
| Rating | 4.7 (9 ratings) | 4.8 (203 ratings) — better |
| Positive reviews | 78.6% of reviews | 78.8% of reviews — better |
| Number of ratings | 9 | 203 — better |
| Update frequency | Every 11 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 27 MB | 362 MB |
| Age rating | 4+ | 4+ |
| Developer | Audio Damage, Inc. | Kai Aras |
Customer experience
Phosphor 3
Agonizer
Bugs and requests
Phosphor 3
Not enough reviews yet to summarise bugs or 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
In-app purchases
Phosphor 3
No in-app purchases
Agonizer
- Chrome Oasis Pack$3.99
- Circuit Bender Pack$3.99
- Neon Nightmare Pack$4.99









