LH Rubbing vs Poseidon Synth
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LH Rubbing
This virtual analog synthesizer app for iPad offers a rich, analog sound. It features multiple oscillators, filters, and LFOs for extensive sound shaping. Control pitch, cutoff, and resonance with an ADSR envelope and add vibrato with keyboard interaction.
- Polyphony synthesizer
- Three wave oscillators
- One noise oscillator
- Two LFOs
- Three type embedded filter
- ADSR envelope generator
- Keyboard vibrato control
Read full descriptionHide full description
LH Rubbing is a polyphony synthesizer app for iPad running on iOS 9.3 or later. It sounds very analog. There are three wave oscillators, one noise oscillator, two LFOs and one three type embedded filter (low-pass, hi-pass and bandpass). Each wave oscillator can generate three kinds of waveform which are triangle, square and saw wave. LFO can be attached to different modul for different modulation or control such as OSC Pitch, PW, Filter Cutoff Frequency, Filter Resonance and OSC Output Mixing. The frequency and amplitude of the 1st LFO can be modified by the 2nd LFO. Pitch, Filter Cutoff Frequency and Resonance can be controlled by the ADSR envelope generator. The Keyboard Rubbing brings up vibrato while control the vibrato rate and depth.
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.
- 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 descriptionHide 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
Verdict
The clearest difference is price: LH Rubbing at Free against Poseidon Synth's $7.99. LH Rubbing also leads on review sentiment (77% vs 59%) and rating (4.2 vs 4.0). Poseidon Synth's advantage is update cadence (every 4 months vs every 26 months). On ratings volume, ads, in-app purchases 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
LH Rubbing is free to download; Poseidon Synth costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.
LH Rubbing holds the better App Store score, 4.2 against 4.0. Both are backed by a comparable volume of ratings — 19 and 33 respectively. Written reviews point the same way: 77% of LH Rubbing's written reviews are positive against 59% of Poseidon Synth's.
LH Rubbing ships an update every 26 months, Poseidon Synth every 4 months. The most recent releases landed on June 6, 2026 and August 4, 2026 respectively.
| Parameter | LH Rubbing | Poseidon Synth |
|---|---|---|
| Price | Free — better | $7.99 |
| Rating | 4.2 (19 ratings) — better | 4.0 (33 ratings) |
| Positive reviews | 76.9% of reviews — better | 58.8% of reviews |
| Number of ratings | 19 | 33 — better |
| Update frequency | Every 26 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPad | iPad |
| Requires iOS | 9.3 — better | 12.0 |
| Further details — not scored | ||
| Size | 12 MB | 328 MB |
| Age rating | 4+ | 4+ |
| Developer | 昊 刘 | Harry Gohs |
Customer experience
LH Rubbing
Poseidon Synth
In-app purchases
LH Rubbing
No in-app purchases
Poseidon Synth
No in-app purchases









