Comparison

Phaser Factory 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

Phaser Factory

Create custom phaser effects with this versatile audio plugin. Design unique sounds by adjusting stages, LFO, and feedback, and save your favorite presets. Developers can even export C++ code for their projects.

Highlights
  • Customizable phaser effects
  • Adjustable number of stages (1-20)
  • LFO width and offset control
  • Feedback chain configuration
  • Save and recall presets
  • Export C++ class for developers
Features
Read full description

GSi Phaser Factory is a versatile phase shifter effect in the likes of some famous guitar pedals such as the Phase 90, the Small Stone, and stuff like that. With Phaser Factory you can create your own phaser and even try to "clone" an existing model. Select the number of phase shifting stages, from 1 up to 20! Set the LFO width and offset. Configure the feedback chain, the output mix and the summing stages. The algorithm is simple and efficient, once you get the perfect vibe, save your presets. And if you're a plugin developer, you can even export a C++ Class that you can use in your project to play the exact preset you've created in Phaser Factory. Phaser Factory is not only a phaser, it's all of them.

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

Phaser Factory1 screens
GSDSP Quantum Filter3 screens

Verdict

The call

The clearest difference is price: Phaser Factory at $6.99 against GSDSP Quantum Filter's $14.99. GSDSP Quantum Filter's advantage is update cadence (every 5 weeks vs every 39 months). On rating, review sentiment, ratings volume and ads 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

Phaser Factory costs $6.99 and GSDSP Quantum Filter $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Phaser Factory against 5.0 for GSDSP Quantum Filter. Both are backed by a comparable volume of ratings — 4 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Phaser Factory ships an update every 39 months, GSDSP Quantum Filter every 5 weeks. The most recent releases landed on August 26, 2026 and September 22, 2026 respectively.

Scorecard2 real differences · 8 level
Phaser Factory versus GSDSP Quantum Filter: the parameters behind the verdict, then further details
ParameterPhaser FactoryGSDSP Quantum Filter
Price$6.99 — better$14.99
Rating5.0 (4 ratings)5.0 (3 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings4 — better3
Update frequencyEvery 39 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.012.0
Further details — not scored
Size7 MB77 MB
Age rating4+4+
DeveloperGenuine SoundwareGustav Scholda

Customer experience

Phaser Factory

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

GSDSP Quantum Filter

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

In-app purchases

None

Phaser Factory

No in-app purchases

None

GSDSP Quantum Filter

No in-app purchases

Questions

Is Phaser Factory free?
Phaser Factory costs $6.99, with no in-app purchases.
Is GSDSP Quantum Filter free?
GSDSP Quantum Filter costs $14.99, with no in-app purchases.
Which has better reviews, Phaser Factory or GSDSP Quantum Filter?
Phaser Factory and GSDSP Quantum Filter are both rated 5.0 out of 5 on the App Store, from 4 and 3 ratings respectively.
Do Phaser Factory or GSDSP Quantum Filter have ads?
Neither Phaser Factory nor GSDSP Quantum Filter shows ads.
Which is updated more often, Phaser Factory or GSDSP Quantum Filter?
Phaser Factory ships an update every 39 months, and GSDSP Quantum Filter every 5 weeks. Most recently, Phaser Factory was updated on August 26, 2026 and GSDSP Quantum Filter on September 22, 2026.

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