strng vs PolyPhase
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
strng
This app generates plucked string sounds using a physical modeling synthesis engine. It offers polyphonic voices, a built-in keyboard, and MIDI control. Shape your sound with delay and resonant filters, and integrate with other music apps.
- Physical modeling string synthesis
- 16 voice polyphony
- Built-in 25-key keyboard with aftertouch
- MIDI controller support (USB/Wi-Fi)
- Stereo ping-pong delay
- Two-channel resonant filter with LFOs
- Audiobus, IAA, and AUv3 support
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Strng is a string synthesiser inspired by the karplus-strong algorithm. The physical modelling starts with a short burst of noise that then guided by a tuned delay buffer and string tension filter, generates plucked string like sounds. No samples are used. Strng is 16 voice polyphonic and can be controlled with an in app 25 key chromatic keyboard or connect prefered midi controller through USB or Wifi. To further shape the sound two post effects are available, a ping-pong stereo delay and two channel resonant filter controlled by two LFOs. Connect to other apps through AudioBus, inter app audio or load in DAWs as AUv3. +++ String synthesis engine +++ 16 voice polyphonic +++ Audiobus, IAA and AUv3 +++ Core MIDI, bluetooth midi and limited MPE +++ 25 multitouch keyboard with aftertouch control +++ Factory presets, save and load your own settings, drag'n drop from files app +++ Aftertouch modulation for attack, sustain, bit crush, resonant filter and detune lfo +++ Stereo ping-pong delay +++ Two channel resonant low pass filter LFOs
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
Screenshots
Verdict
The clearest difference is price: strng at $4.99 against PolyPhase's $19.99. strng also leads on review sentiment (84% vs 76%) and device support (3 vs 1). PolyPhase's advantage is update cadence (every 3 weeks vs every 4 months). On rating, ratings volume, ads and in-app purchases 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
strng costs $4.99 and PolyPhase $19.99 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 — 4.7 for strng against 4.6 for PolyPhase. Both are backed by a comparable volume of ratings — 35 and 26 respectively. Written reviews are what separate them: 84% of strng's written reviews are positive against 76% of PolyPhase's.
strng ships an update every 4 months, PolyPhase every 3 weeks. Both last shipped on October 7, 2026.
| Parameter | strng | PolyPhase |
|---|---|---|
| Price | $4.99 — better | $19.99 |
| Rating | 4.7 (35 ratings) — better | 4.6 (26 ratings) |
| Positive reviews | 84.4% of reviews — better | 76.2% of reviews |
| Number of ratings | 35 — better | 26 |
| Update frequency | Every 4 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 9.0 — better | 10.0 |
| Further details — not scored | ||
| Size | 4 MB | 35 MB |
| Age rating | 4+ | 4+ |
| Developer | Erik Sigth | Marcos Kohler |
Customer experience
strng
PolyPhase
In-app purchases
strng
No in-app purchases
PolyPhase
No in-app purchases









