PolyPhase vs AddStation
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PolyPhase
Create complex, interwoven melodies and rhythms with a generative sequencer. Control note generation, randomize sequences, and integrate with external MIDI hardware or the included wavetable synthesizer. Save and recall your creations with presets and snapshots.
- Generative melody creation with phase offsets
- 8 independent sequencers with customizable properties
- Draw own notes or use intelligent randomization
- Wavetable synthesizer with FX
- MIDI output and input support
- Global Key/Scale filtering and Chord Masks
- Save/Load presets and Snapshots
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PolyPhase is a generative sequencer! Melodies on a Master Track are created on the fly & copied, with phase offsets, to Follower Tracks. This structure, along with the interplay of various probabilities, leads to interwoven melodies and rhythms. You can disable the generation of notes & draw your own, or select some of the randomization functions Send MIDI to external hardware, other iOS instruments, or use the included wavetable synthesizer! - 8 independent Sequencers with their own rate, direction, transposition & other properties - Disable the generation of notes to draw your own, or use some of the intelligent functions provided - Random Euclid & Drum Sequences - The Wavetable Synth + FX lets you use PolyPhase even if you don't own any external Instruments - Filter notes to a Global Key / Scale and toggle Chord Masks - Save / Load Presets - Snapshots for install recall of your Sequences - Intelligently Randomize and Morph your Sequences & Synth sounds - Accepts external MIDI clock & can provide clock to other devices - Audiobus (Audio / State) & Inter-App Audio support - Link Support
AddStation
Explore new sonic territories with this advanced additive synthesis tool. Create complex timbres by combining thousands of sine waves and unique morph sequencing. Integrate seamlessly with iOS production environments and enjoy a suite of built-in effects.
- Fractal additive synthesis
- Sound morphing
- Over 170 sound presets
- AUv3 AudioUnit integration
- Built-in effects suite
- Audiobus 3 and Ableton Link support
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The next generation of additive synthesis Additive synthesis is a sound synthesis technique that creates timbre by adding sine waves together. The timbre of musical instruments can be considered to consist of multiple harmonic or inharmonic partials or overtones. VirSyn already has a remarkable track record of products ( CUBE, POSEIDON ) trying to make this virtually unlimited synthesis method manageable for creative sound designers and musicians. AddStation is the next step forward giving you a tool to explore completely new sonic territory. The massive amount of sine waves in AddStation - thousands per voice - together with unique morph sequencing blocks blur the frontiers between analog and digital sonic realms. And all this integrated in all relevant iOS production environments especially the emerging AUv3 AudioUnit standard. Synthesis • Fractal additive synthesis • over 170 sound presets • Four parts with 8 Additive Sequence Blocks • Sound morphing • up to 512 partials per voice with independent AD envelopes • harmonic/inharmonic spectra • Ringmodulation • arbitrary filter function and noise spectra • four independent analog style Arpeggiators Effects • Chorus • Phaser • Flanger • Overdrive • Parametric EQ • Echo/Delay • Reverb Global • AUv3 for Host integration • Audiobus 3 compatible (Input slot) with state saving • Support for Ableton Link. • Inter-app audio compatible (Instrument/Generator) • CoreMIDI / Virtual MIDI • Audio recorder.
Screenshots
Verdict
The clearest difference is price: AddStation at $8.99 against PolyPhase's $19.99. AddStation also leads on update cadence (weekly vs every 3 weeks) and device support (3 vs 1). PolyPhase's advantage is iOS requirement (10.0 vs 12.0). On rating, review sentiment, ratings volume and ads 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
PolyPhase costs $19.99 and AddStation $8.99 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 — 4.6 for PolyPhase against 4.5 for AddStation. Both are backed by a comparable volume of ratings — 26 and 43 respectively. Written reviews are what separate them: 76% of PolyPhase's written reviews are positive against 82% of AddStation's.
PolyPhase ships an update every 3 weeks, AddStation weekly. The most recent releases landed on October 7, 2026 and October 9, 2026 respectively.
| Parameter | PolyPhase | AddStation |
|---|---|---|
| Price | $19.99 | $8.99 — better |
| Rating | 4.6 (26 ratings) — better | 4.5 (43 ratings) |
| Positive reviews | 76.2% of reviews | 82.1% of reviews — better |
| Number of ratings | 26 | 43 — better |
| Update frequency | Every 3 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 10.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 35 MB | 133 MB |
| Age rating | 4+ | 4+ |
| Developer | Marcos Kohler | Harry Gohs |
Customer experience
PolyPhase
AddStation
In-app purchases
PolyPhase
No in-app purchases
AddStation
No in-app purchases









