Comparison

strng vs Poseidon Synth

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

Poseidon Synth

Explore vast sonic landscapes with this advanced synthesizer. It combines analog synthesis with spectral modeling for unique sound design, offering powerful filters, spatialization, and a vast library of presets and sound models.

Highlights
  • Spectral model oscillator
  • F-Domain Filter with variable slope
  • Spatializer for stereo movement
  • Extensive sound browser
  • Arpeggiator with programmable sequences
  • Built-in effects suite
Read full description

Poseidon Synth - The Ocean of Sound For all creatures in the ocean of sound - Sonic textures from other worlds, Analog signature sounds,  Cut-through-the-mix leads and silkily smooth pads: Poseidon sets a new standard for sound design and ease of use. All of this was made possible through a combination of the familiar, conceptual simplicity of the analog synthesis and our frequency domain based Spectral modelling synthesis technology. Spectral model oscillator Select a basic sound model from over hundred delivered with Poseidon. The basic sound model determines the sound characteristic you want to start: taking a artificial model like “Sawtooth” gives you analog style sounds. Use complex models from analyzed samples for earth shaking ambients and evolving pads. Model parameters High level controls allow for changing the spectral shape, the harmonicity and balances the level of residual noise and spectral amount of the oscillator model. F-Domain Filter The newly developed F-Domain filter allow for drastic changes in the resulting sound spectrum. Five filter types including lowpass/highpass characteristic can be used to shape the sound. They have the usual controls like cutoff but also very unusual ones like a variable slope ranging from 0 dB to 72 dB / Octave and independent controls for resonance and bandwidth! This kind of controls are only possible in the context of our F-Domain synthesis technology. This results in an extremely clear filter sound with breathtaking fast modulation possibilities.

The filter type “Inverse” interprets the sound model as a "Source" and a resonant body "Filter". The cutoff parameter shifts the filterbase - this is the equivalent to making the instrument body smaller or bigger. Spatializer This simple control gives your sound a distinctive moving distribution in the stereo panorama. Every atomic sound particle has it´s own path through the space ! Sound browser The sound browser in Poseidon gives you a fast selection of sounds based on category and timbre. Spectral modelling synthesis • Harmonic/Inharmonic/Noise sound models • 512 oscillators per voice • 300 Sound models / 600 factory presets Unique sound control • Pitch modulation / Harmonicity control • Time machine • Timbre control • Frequency Domain Filter • Spatializer Arpeggiator • Uses programmable sequences with up to 32 steps.  • Can trigger single notes and chords. • Unique randomiser generates Arpeggios with 100% usability. • 32 Arpeggios included, unlimited user arpeggios possible. • For each step you can program tie, accent, transposition and note order Effects • Chorus • Phaser • Flanger • Distortion (aliasing free!) • Equalizer • Echo/Delay • Reverb Global • Audiobus 3 compatible (Input slot) • Audio Unit AUv3 • Inter-app audio compatible (Instrument/Generator) • CoreMIDI / Virtual MIDI / Tempo Sync / MIDI Learn • Audio recorder with Metronome. • Audio pasteboard / File sharing. • Ableton Link support • Bluetooth audio A2DP

Screenshots

strng4 screens

Verdict

The call

The clearest difference is rating: strng at 4.7 against Poseidon Synth's 4.0. strng also leads on review sentiment (84% vs 59%) and price ($4.99 vs $7.99). On ratings volume, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

strng costs $4.99 and Poseidon Synth $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

strng holds the better App Store score, 4.7 against 4.0. Both are backed by a comparable volume of ratings — 35 and 33 respectively. Written reviews point the same way: 84% of strng's written reviews are positive against 59% of Poseidon Synth's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 19, 2026 and October 20, 2026 respectively.

Scorecard5 real differences · 5 level
strng versus Poseidon Synth: the parameters behind the verdict, then further details
ParameterstrngPoseidon Synth
Price$4.99 — better$7.99
Rating4.7 (35 ratings) — better4.0 (33 ratings)
Positive reviews84.4% of reviews — better58.8% of reviews
Number of ratings35 — better33
Update frequencyEvery 4 monthsEvery 4 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod — betteriPad
Requires iOS9.0 — better12.0
Further details — not scored
Size4 MB328 MB
Age rating4+4+
DeveloperErik SigthHarry Gohs

Customer experience

strng

All ratings35 ratings
Positive88.6%
Neutral8.6%
Negative2.9%
Written reviews32 reviews
Positive84.4%
Neutral9.4%
Negative6.3%

Poseidon Synth

All ratings33 ratings
Positive72.7%
Neutral12.1%
Negative15.2%
Written reviews51 reviews
Positive58.8%
Neutral15.7%
Negative25.5%

In-app purchases

None

strng

No in-app purchases

None

Poseidon Synth

No in-app purchases

Questions

Is strng free?
strng costs $4.99, with no in-app purchases.
Is Poseidon Synth free?
Poseidon Synth costs $7.99, with no in-app purchases.
Which has better reviews, strng or Poseidon Synth?
strng is rated higher. strng averages 4.7 out of 5 from 35 ratings, while Poseidon Synth averages 4.0 from 33 ratings.
Do strng or Poseidon Synth have ads?
Neither strng nor Poseidon Synth shows ads.
Which is updated more often, strng or Poseidon Synth?
strng ships an update every 4 months, and Poseidon Synth every 4 months. Most recently, strng was updated on October 19, 2026 and Poseidon Synth on October 20, 2026.

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