Comparison

JAX SR 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

JAX SR

This audio effect app allows selective frequency range processing for modulation effects. It offers a classic phaser with MIDI control and dynamic mix adjustment, preventing negative side effects from full-range processing. It requires a host application to function.

Highlights
  • Selective frequency range processing
  • Classic phaser modulation
  • Optional MIDI control
  • Dynamic mix adjustment
  • Universal app for Apple devices
Features
Read full description

The manual is here : https://audio.digitster.com/wp-content/uploads/2024/05/JAX-SR-Phaser-Manual.pdf The JAX SR Series are AudioUnits (AUv3), which allow to select a frequency range for effect processing. This one provides a classic phaser modulation effect with optional direct MIDI control assignment to the parameters. If (especially) modulation effects are applied to the entire frequency range, this usually will introduce negative side effects. The JAX [SR] Series allow a selective frequency range and dynamic adjustment of the mix easily. More information can be found on the product website at: https://audio.digitster.com/ Please note, that AudioUnits (AUv3) require a supporting host application to perform. This build (like all our latest releases) is truly 'universal', meaning, the audio unit is available for: - MacOS (Apple Silicon) - iOS (all actual iPhones) - iPadOS (all actual iPads) - visionOS (Apple Vision Pro) Requirements: MacOS 10.15++ iOS 14.0++

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

JAX SR4 screens
GSDSP Quantum Filter3 screens

Verdict

The call

The clearest difference is price: JAX SR at $6.99 against GSDSP Quantum Filter's $14.99. GSDSP Quantum Filter's advantage is ratings volume (3 vs 1) and iOS requirement (12.0 vs 14.0). On rating, 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

JAX SR 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 JAX SR against 5.0 for GSDSP Quantum Filter. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

UpkeepUpdate frequency

JAX SR ships an update every 4 weeks, GSDSP Quantum Filter every 5 weeks. The most recent releases landed on June 25, 2026 and September 22, 2026 respectively.

Scorecard3 real differences · 7 level
JAX SR versus GSDSP Quantum Filter: the parameters behind the verdict, then further details
ParameterJAX SRGSDSP Quantum Filter
Price$6.99 — better$14.99
Rating5.0 (1 ratings)5.0 (3 ratings)
Positive reviews—100.0% of reviews
Number of ratings13 — better
Update frequencyEvery 4 weeks — betterEvery 5 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.012.0 — better
Further details — not scored
Size21 MB77 MB
Age rating4+4+
DeveloperJens GuellGustav Scholda

Customer experience

JAX SR

All ratings1 ratings
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

JAX SR

No in-app purchases

None

GSDSP Quantum Filter

No in-app purchases

Questions

Is JAX SR free?
JAX SR 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, JAX SR or GSDSP Quantum Filter?
JAX SR and GSDSP Quantum Filter are both rated 5.0 out of 5 on the App Store, from 1 and 3 ratings respectively.
Do JAX SR or GSDSP Quantum Filter have ads?
Neither JAX SR nor GSDSP Quantum Filter shows ads.
Which is updated more often, JAX SR or GSDSP Quantum Filter?
JAX SR ships an update every 4 weeks, and GSDSP Quantum Filter every 5 weeks. Most recently, JAX SR was updated on June 25, 2026 and GSDSP Quantum Filter on September 22, 2026.

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