Comparison

GSDSP MagicFilter vs SL Knock

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

Head to head
About

GSDSP MagicFilter

This audio effect plugin allows for intricate, non-linear filter shaping and dynamic spectral transformations. Create unique soundscapes by designing custom filter curves and modulating them for subtle to extreme audio manipulation.

Highlights
  • Multi-curve spectral filtering
  • Independent filter amounts per frequency
  • Morph between four filter curves
  • Curve Modifier for shifting and inverting
  • Global cut/boost controls
  • Built-in lowpass and highpass filters
  • Wet/dry mix control
Features
Read full description

This Spectral Processing Workstation lets you craft evolving, non-linear filter shapes and movements impossible to achieve with analogue EQs. Multi-Curve Spectral Filtering MagicFilter is a multi-curve spectral filter and EQ workstation designed for detailed, creative frequency shaping. Apply independent filter amounts per frequency or frequency range, then mix, modulate, and spread your curves to create anything from subtle, organic movement to extreme spectral transformations. Beyond Conventional EQ Unlike analogue or traditional digital EQs, MagicFilter operates in the frequency domain, enabling filter curves and dynamics that would be impossible with hardware. Design non-linear, highly customized shapes and introduce dynamic movement through modulation. Morph seamlessly between four different filter curves, and use the Curve Modifier to shift, invert, or skew them — even in stereo — for precise and flexible control over spectral motion. Global Controls & Fine Shaping Quickly adjust cut and boost amounts to refine your overall curve, and use the built-in lowpass and highpass filters to set the tonal boundaries of your sound. Fine-tune the balance using wet gain and dry/wet control, enabling anything from subtle enhancement to bold, transformative filtering. These controls ensure fast, intuitive workflow while offering deep flexibility. MagicFilter 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

About

SL Knock

Features
Read full description

SL Knock is a focused AUv3 dynamics and tone effect for adding punch, body and controlled low-end weight to drums, samples and loops. • Fast controls for impact and body • Tone shaping for tighter or heavier character • Mix control for parallel processing • Factory presets and local user presets • AUv3 support for compatible iPad music hosts Works as a standalone preview app and as an AUv3 effect in GarageBand, AUM, Cubasis, BeatMaker 3 and other compatible hosts.

Screenshots

GSDSP MagicFilter3 screens
SL Knock3 screens

Verdict

The call

The clearest difference is price: SL Knock at $6.99 against GSDSP MagicFilter's $29.99. SL Knock also leads on update cadence (weekly vs every 6 weeks). GSDSP MagicFilter's advantage is iOS requirement (13.0 vs 15.0). On 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

CostPrice · In-app purchases · Ads · Monetization

GSDSP MagicFilter costs $29.99 and SL Knock $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

GSDSP MagicFilter ships an update every 6 weeks, SL Knock weekly. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 6 level
GSDSP MagicFilter versus SL Knock: the parameters behind the verdict, then further details
ParameterGSDSP MagicFilterSL Knock
Price$29.99$6.99 — better
Rating5.0 (4 ratings) — better—
Number of ratings4 — better—
Update frequencyEvery 6 weeksWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size52 MB28 MB
Age rating4+4+
DeveloperGustav ScholdaVIACHESLAV ZHILTSOV

In-app purchases

None

GSDSP MagicFilter

No in-app purchases

None

SL Knock

No in-app purchases

Questions

Is GSDSP MagicFilter free?
GSDSP MagicFilter costs $29.99, with no in-app purchases.
Is SL Knock free?
SL Knock costs $6.99, with no in-app purchases.
Do GSDSP MagicFilter or SL Knock have ads?
Neither GSDSP MagicFilter nor SL Knock shows ads.
Which is updated more often, GSDSP MagicFilter or SL Knock?
GSDSP MagicFilter ships an update every 6 weeks, and SL Knock weekly. Most recently, GSDSP MagicFilter was updated on October 30, 2026 and SL Knock on October 31, 2026.

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