Comparison

strng vs Filterstation2

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

Filterstation2

This app offers a versatile dual filter effect for music production, inspired by classic hardware. It features twelve filter algorithms, an envelope follower, and multiple operating modes for creative sound shaping. Its user-friendly interface and resizable GUI make it a powerful tool for producers.

Highlights
  • Twelve filter algorithms
  • Envelope follower with sidechain
  • VCA mode for tremolo/gate
  • LFO with tempo sync
  • Serial, parallel, and stereo modes
  • Resizable GUI
  • Cross-platform preset manager
Features
Read full description

Filterstation 2 is the Audio Damage dual filter, built for sound design and performance rather than corrective EQ. It runs two resonant filters in series, in parallel, or split across the stereo field, with twelve filter algorithms and a full set of modulation tools for movement, distortion, and rhythm. FEATURES Twelve filter algorithms, including our 914 bandpass and Filterpod lowpass models, a clean state-variable filter, and an MS20-style filter, covering lowpass, highpass, bandpass, and notch. Each of the two filter slots can run a different one. Serial, parallel, and true stereo routing. Run the filters one into the next, side by side, or split hard left and right. Envelope follower with stereo sidechain. Drive the cutoff from a signal's own dynamics for auto-wah, or feed in an external source so one track opens the filter on another. LFO with twelve patterns, internal or tempo-synced. VCA mode for tremolo and gating. FSU section for extra signal hacking, for when clean is not the point. Resizable vector interface, sharp on every iPhone and iPad display. Universal preset system. XML-based presets move between iOS and the desktop versions. IN USE... Sweep the cutoff by hand for filter rises and drops. Set the envelope follower to track the input for an auto-wah that moves with your playing. Patch a kick into the sidechain to duck a pad or bassline in time. Run the two filters in series for steep formant shapes, or in parallel for wide dual-band sweeps. Tempo-sync the LFO for rhythmic gating, then bring in the FSU section when the part needs to fall apart. Filterstation 2 runs as an AUv3 plugin inside any compatible iOS host, including AUM, Cubasis, Drambo, apeMatrix, and GarageBand. It is also available for macOS, Windows, and Linux as a desktop plugin, and presets move freely between them. Requires iOS 13 or later. An AUv3 host app is recommended. Features • Twelve different filter algorithms, including MS20 emulation and our classic 914 bandpass and Filterpod lowpass models. • VCA mode for tremolo and gate effects. • LFO with twelve different patterns, and both internal and tempo sync modes. • Envelope follower for dynamic control of filter frequency. • Serial, parallel, and true stereo operating modes. • Easy-to use interface for quick programming. • Vector-based resizable GUI. Use just the filter screen, slide the controls over it, or (in hosts that allow it) open up the whole UI. • Cross-platform XML-based preset manager; copy your desktop presets to the iOS version using Handoff, or share them with your friends and in forums. • Full PDF manual available at Support link.

Screenshots

strng4 screens
Filterstation22 screens

Verdict

The call

The clearest difference is update cadence: strng at every 4 months against Filterstation2's every 19 months. strng also leads on rating (4.7 vs 4.5) and review sentiment (84% vs 75%). On price, 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

CostPrice · In-app purchases · Ads · Monetization

strng costs $4.99 and Filterstation2 $4.99 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 4.5. Both are backed by a comparable volume of ratings — 35 and 19 respectively. Written reviews point the same way: 84% of strng's written reviews are positive against 75% of Filterstation2's.

UpkeepUpdate frequency

strng ships an update every 4 months, Filterstation2 every 19 months. The most recent releases landed on September 29, 2026 and September 25, 2026 respectively.

Scorecard4 real differences · 6 level
strng versus Filterstation2: the parameters behind the verdict, then further details
ParameterstrngFilterstation2
Price$4.99$4.99
Rating4.7 (35 ratings) — better4.5 (19 ratings)
Positive reviews84.4% of reviews — better75.0% of reviews
Number of ratings35 — better19
Update frequencyEvery 4 months — betterEvery 19 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better12.0
Further details — not scored
Size4 MB29 MB
Age rating4+4+
DeveloperErik SigthAudio Damage, Inc.

Customer experience

strng

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

Filterstation2

All ratings19 ratings
Positive84.2%
Neutral5.3%
Negative10.5%
Written reviews12 reviews
Positive75.0%
Neutral8.3%
Negative16.7%

In-app purchases

None

strng

No in-app purchases

None

Filterstation2

No in-app purchases

Questions

Is strng free?
strng costs $4.99, with no in-app purchases.
Is Filterstation2 free?
Filterstation2 costs $4.99, with no in-app purchases.
Which has better reviews, strng or Filterstation2?
strng is rated higher. strng averages 4.7 out of 5 from 35 ratings, while Filterstation2 averages 4.5 from 19 ratings.
Do strng or Filterstation2 have ads?
Neither strng nor Filterstation2 shows ads.
Which is updated more often, strng or Filterstation2?
strng ships an update every 4 months, and Filterstation2 every 19 months. Most recently, strng was updated on September 29, 2026 and Filterstation2 on September 25, 2026.

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