sTilt free eq by TBProAudio

sTilt is a free equalizer VST, VST3, Audio Unit, RTAS, AAX plugin developed by TBProAudio. Compatible OS(s): Windows 64b, macOS.

sTilt is a linear phase filter which tilts the audio spectrum around a given center frequency.


  • adjustable slope from -6dB/Oct to +6dB/Oct.
  • adjustable center frequency.
  • 5 quality modes: low, eco, medium, high, max.
  • unit autogain.
  • zero and minimum phase filter design.
  • switch-able clip protection.
  • filter limit.
  • stereo/left/right/mid/side channel selection.
  • stereo/left/right/mid/side channel monitoring.
  • sample exact A/B comparison.
  • output gain.
  • signal mixing.
  • large and easy to use GUI.
  • free.


SplineEQ free eq by Photosounder

SplineEQ is a free equalizer VST, Audio Unit plugin developed by Photosounder. Compatible OS(s): Windows 64b, macOS.

SplineEQ is a linear phase equalizer plugin. Designed to be simple and flexible, SplineEQ allows you to create filters using Bézier splines, the best known way to design curves.


Linear phase equalizer. Offers a better sound quality than the more common minimum phase equalizers by not affecting the phase of sound, only the intensity of frequencies, which makes it easier to achieve good sounding results. Also has the advantage of not incurring aliasing artifacts.

Spline-based filter design. Filters are simply created by designing a spline curve which can be made to adopt any imaginable shape. No filter types to choose from, all points simply define part of the shape of the filter’s spline curve. The actual filter’s frequency profile is displayed as a dashed curve when it differs from the ideal spline curve (this can be changed by changing the filter’s resolution).

Up to 60 bands (only up to 4 in the free version of SplineEQ) or as low as 1. You can create or disable bands by double clicking on the visualisation area of the interface and adjust them either in that area or using the knobs or even the automatable parameter sliders in the host’s interface.

Simple curve modification functions. You can modify the curve as a whole using the transpose function to shift the curve up and down by up to 10 octaves, affect the overall gain to shift all gain settings up or down evenly or even change the gain scale to apply a ratio to all gains, thus enabling you to either flatten, exaggerate or reverse the shape of a curve.

Frequency analyser. More intuitive than your usual logarithmic curve frequency display, this frequency analyser shows you the intensity of frequencies before and after the filtering with colours. It’s also fine tuned so that intensities at different frequencies are represented in a way that matches closely to our perception. It moves in a fluid manner in sync with the source sound and has a frequency resolution of about 10 Hz.

Smooth and fluid graphics. The whole interface responds fluidly to change, even the frequency visualisation has a great frame rate and all the graphics are perfectly anti-aliased.

-Infinite dB to +60 dB gain range. This allows you to completely silence entire ranges of the spectrum or to really bring back some fainter harmonics by boosting their amplitude thousandfold. Gains are represented logarithmically between -60 dB and +60 dB and linearly below -60 dB. Given the uniquely immense gain range there’s also a built-in limiter whose knob lights up when over the adjustable threshold.

Smooth transitions. Changing parameters, either by adjusting the knobs, the graph or by parameter automation is always done smoothly and creates no audio artifacts.

Adjustable resolution, latency and CPU usage. The resolution of the filter can be lowered or increased (up to roughly 22 Hz) and the processing latency can be changed to obtain a lower CPU usage or a lower latency.

Good performance. Linear phase equalizers always require more power than other types of equalizers. However SplineEQ is as fast or faster than other linear phase equlizers, often with less latency.

Presets are available here and can be saved or open (not with the free version of SplineEQ). Their format is compatible across all platforms and hosts and can be edited with a text editor.

Also supports all sampling rates (384 kHz included), is available on both Windows and Mac (Intel and PowerPC), in VST (2.4) and AU format, in 32 and 64-bits. All input, output and processing are done in 64-bit floating point format and in stereo.


QRange free eq by lkjb

QRange is a free equalizer VST, VST3, Audio Unit plugin developed by lkjb. Compatible OS(s): Windows 64b, macOS.

lkjb QRange is a IIR linear phase EQ with the following features:

  • 12 bands (sortable by frequency).
  • Each band can be used as peak, shelf and cut filter.
  • Cut filters are available with 12, 24 and 48 dB/oct steepness.
  • Stereo/Left/Right/Mid/Side routing per band.
  • Global gain for loudness adjustments.
  • Resizable user interface.
  • Gain Match (new in version 1.0.1).

  • Latency-free minimal phase mode (new in version 1.1.0).

The analyser can be set to analyse pre-EQ and post-EQ signal applying the same routings that are available per band. It is possible to adjust the analyser minimum/maximum magnitude by dragging the scale on the right (visible only if the analyser is active).

A menu which is available via the gearwheel provides:

  • Adjusting Analyser Range.
  • Adjusting frequency display magnitude.
  • Adjusting the plugin latency.
  • Setting a default EQ state and/or user interface size for new instances.

QRange uses IPlug-Youlean as plugin framework. From JUCE juce_core and juce_audio_basics modules are used.


  • 1.1.3:

    • Added option to draw the EQ curve a bit thicker.

    • Added option for band color hints to assign bands more easily to handles.

  • 1.1.2:

    • fixed vst3 crashing Cubase 10 when changing latency setting.

    • hopefully fixed tail playing when turning plugin off and on again in Logic.

  • 1.1.1:

    • once again fixed default settings not working properly (latency & filter type was not saved).

    • added option to run analyser only while user interface is showing.

  • 1.1.0:

    • fixed default settings not working correctly in case of overwriting old defaults.

    • fixed latency setting not being loaded with projects.

    • added added non Linear Phase but latency free mode.

  • 1.0.3:

    • fixed crash in Ableton Live when changing latency.

    • fixed QRange AU not validating (silent update without new version for macOS; reinstall plugin if this is encountered).

  • 1.0.2:

    • show whether gain match is possible.

    • change Q-factor in frequency view by ctrl-dragging the handle.

    • added presets.

  • 1.0.1:
    • user interface updat: filled analyser curve.
    • user interface udate: band color according to routing.
    • user interface update: rearranged buttons & different button style.
    • added gain match.
    • added band solo (right click on band number or via band handle context menu).
  • 1.0.0: First release.