Comparison

DubFilter vs GSDSP Quantum Filter

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

Head to head
About

DubFilter

This app provides a powerful dual filter with resonance and an exclusive overlap parameter. It also features a redesigned stereo sample player with LFO and scrubbing, along with extensive MIDI and file management capabilities.

Highlights
  • Dual low-pass/high-pass filter
  • Resonance and Overlap parameter
  • Stereo sample player with LFO
  • Scrubbing capabilities
  • Audiobus and Inter-App Audio support
  • MIDI control and file management
  • Preset morphing pad
Features
Read full description

The Dub Filter is a dual low-pass/high-pass 24/48 dB filter, with resonance and the exclusive Overlap parameter! It contains a completely redesigned stereo sample player with LFO and scrubbing capabilities. Main Features: - Audiobus and Inter-App Audio support (sender and FX) - State Variable Filter (Low-Pass and High-Pass) with resonance and overlap - Built In Stereo Sampler with varispeed and scrubbing - Control Manager LFO for all the Parameters - Midibus, Virtual Midi and Network: 14 bit NRPN controllers - File Manager, sharing common audio files via iTunes, Dropbox and AudioCopy - Snapshots Presets Morphing Pad - Post Fx Chain: Low-shelf Filter, High-shelf and Compressor

About

GSDSP Quantum Filter

This audio effect plugin offers analog-modeled filters with flexible routing and dynamic modulation for creative sound design. It provides extensive control over tone shaping and complex filtering with various filter types and configurations.

Highlights
  • Analog-modelled filters
  • 11 filter modes
  • Series and parallel routing
  • Dynamic modulation support
  • Stereo and dual mono modes
  • MIDI control integration
Features
Read full description

Analog warmth meets flexible routing and dynamic modulation in a filter workstation built for creative sound design. Analog-Modelled Filters Quantum Filter uses resonant, analog-modelled filter designs that behave smoothly and musically across the entire spectrum. With no cramping, stepping, or digital artefacts, the filters remain stable even under rapid modulation. At high resonance settings they can reach self-oscillation, similar to classic hardware circuits. Filter Types & Routing Choose from 11 filter modes, including Lowpass, Highpass, Bandpass, Notch, Shelving options, Bell, and Ladder Lowpass in 1–4 pole configurations. Combine filters in series (up to three stages) or parallel (up to two), resulting in over 2,000 possible routing combinations for detailed tone shaping and complex layered filtering. Built for Modulation Designed to handle fast, artefact-free modulation, Quantum Filter responds cleanly even under rapid parameter changes. Its stability makes it suitable for dynamic environments, rhythmic modulation, or complex movement across multiple filter stages. Stereo and Dual Mono Switch between stereo and dual mono modes to shape the stereo image. In dual mono mode, left and right channels can move independently, enabling asymmetric movement, wider imaging, or separate modulation paths for each side. MIDI Control Quantum Filter integrates ADSR & AR modulators that respond directly to MIDI, allowing envelope-driven filter motion that behaves like a synthesizer’s filter section. This integration adds expressive control for rhythmic gating, animated sweeps, and dynamic shaping based on your playing or sequencing. Quantum Filter is an AUv3 audio effect plugin compatible with Logic Pro, AUM, Cubasis, GarageBand and many more. A Desktop version is also available for Windows and macOS (VST3 / AU / AAX). More information here: https://gs-dsp.com/products

Screenshots

DubFilter4 screens
GSDSP Quantum Filter3 screens

Verdict

The call

The clearest difference is price: DubFilter at Free against GSDSP Quantum Filter's $14.99. DubFilter also leads on ratings volume (71 vs 3). GSDSP Quantum Filter's advantage is in-app purchases (none vs 1) and review sentiment (100% vs 73%). On ads 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

CostPrice · In-app purchases · Ads · Monetization

DubFilter is free to download; GSDSP Quantum Filter costs $14.99 up front. DubFilter sells 1 one-off in-app purchase. GSDSP Quantum Filter asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

GSDSP Quantum Filter holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: DubFilter has 71 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 73% of DubFilter's written reviews are positive against 100% of GSDSP Quantum Filter's.

UpkeepUpdate frequency

DubFilter ships an update every 6 months, GSDSP Quantum Filter every 5 weeks. Both last shipped on September 22, 2026.

Scorecard8 real differences · 2 level
DubFilter versus GSDSP Quantum Filter: the parameters behind the verdict, then further details
ParameterDubFilterGSDSP Quantum Filter
PriceFree — better$14.99
Rating4.7 (71 ratings)5.0 (3 ratings) — better
Positive reviews73.3% of reviews100.0% of reviews — better
Number of ratings71 — better3
Update frequencyEvery 6 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.012.0 — better
Further details — not scored
Size12 MB77 MB
Age rating4+4+
DeveloperAmazing NoisesGustav Scholda

Customer experience

DubFilter

All ratings71 ratings
Positive91.5%
Neutral2.8%
Negative5.6%
Written reviews30 reviews
Positive73.3%
Neutral6.7%
Negative20.0%

GSDSP Quantum Filter

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

DubFilter

One-time1
  • Audio Unit Plugin Support$1.99
None

GSDSP Quantum Filter

No in-app purchases

Questions

Is DubFilter free?
DubFilter is free to download, with in-app purchases available.
Is GSDSP Quantum Filter free?
GSDSP Quantum Filter costs $14.99, with no in-app purchases.
Which has better reviews, DubFilter or GSDSP Quantum Filter?
GSDSP Quantum Filter is rated higher. DubFilter averages 4.7 out of 5 from 71 ratings, while GSDSP Quantum Filter averages 5.0 from 3 ratings.
Do DubFilter or GSDSP Quantum Filter have ads?
Neither DubFilter nor GSDSP Quantum Filter shows ads.
Which is updated more often, DubFilter or GSDSP Quantum Filter?
DubFilter ships an update every 6 months, and GSDSP Quantum Filter every 5 weeks. Most recently, DubFilter was updated on September 22, 2026 and GSDSP Quantum Filter on September 22, 2026.

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