Version 1.2.2 — available now

gFractor

A powerful and flexible spectrum
analyzer for modern audio production.

Free Download Explore features
Read the full manual

Spectrum, scope, goniometer, loudness, and the full picture, in one window.

VST3 · AU · Standalone · macOS, Windows, Linux · Free, no account

Introduction

See it in action

What makes it different

Tools that think like musicians

From sound design to mixing and mastering — gFractor gives you precise visual feedback and deep insight into your audio at every stage of the workflow.

01 — Advanced Analysis Modes

Three modes.
Every perspective.

Switch between Mid/Side, Left/Right, and Transient/Tone analysis to explore your signal from any angle. Monitor individual components — isolate transients from tonal content, or hear the mid and side channels in complete separation.

Mid / Side Left / Right Transient / Tone Component monitoring
gFractor spectrum analyzer with Mid/Side channel mode controls
02 — Signal Comparison

Main and sidechain,
side by side

Visually compare your main signal against a sidechain reference — instantly revealing spectral relationships between tracks. Swap main and sidechain with a single key press for rapid A/B analysis without breaking your flow.

Main signal Sidechain One-key swap Visual overlay
gFractor overlaid primary and secondary spectrum curves
03 — Stereo Analysis

Your stereo field,
fully mapped.

Comprehensive stereo visualization in one place: a goniometer for phase and imaging, a correlation meter for mono compatibility, and stereo width broken down per octave — so you know exactly where your width is coming from and where it isn't.

Goniometer Correlation meter Width per octave Band-pass filter
gFractor stereo analysis with goniometer, correlation and width per octave
04 — Target Save & Compare

Save a target.
Match it later.

Capture any Peak Hold curve as a reusable target and save it to a file. Load it back in any session to compare against your current track — perfect for matching tonal balance across mixes or checking a master against a reference.

Peak Hold capture Save / Load Reference overlay Cross-session
gFractor save, load and target curve controls
05 — Loudness Metering

Loudness,
to spec.

A full ITU-R BS.1770-4 / EBU R128 loudness meter sits alongside the analyzer. Track short-term and integrated LUFS, loudness range, and dynamics at a glance — with momentary, short-term, and peak maximums held since the last reset, so you can hit a delivery target with confidence.

Short-term & Integrated Loudness Range Dynamics Max hold
gFractor LUFS loudness metering panel

Available now

Free. No compromises.

No demo mode. No watermark. No 30-day trial.
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v1.2.2 Previous versions
~/gFractor — CHANGELOG.md
$ cat v1.2.2.md
# gFractor 1.2.2
Released 2026-08-04
## New
+ Optional piano keyboard under the spectrum, frequency-aligned with the plot (Display tab, off by default)
+ Hovering the plot marks the key under the cursor and carries the crosshair down to it
+ Add and remove guidelines (up to 6) from the Guidelines preferences tab
+ Guideline slope is freely settable per line, from -12 to +12 dB/oct
+ Horizontal scrollbar on the oscilloscope when zoomed in
## Changed
* The spectrum crosshair now follows the cursor even with Show Tooltip off
* Show Tooltip now only controls the intersection dots and the freq/dB/note readout
* Guideline slopes are stored per line and persisted; existing setups keep their 0 / -3 / -4.5 / -6 dB/oct lines
* Preferences: every tab groups its rows into framed cards; Display puts Layout and On-screen help side by side
## Fixes
- Reset to Defaults now actually resets the trace colours
- Transport-synced Scope sweep stays alive when looping a region shorter than the window
- Scope now blanks past the host loop boundary and keeps the waveform when the view is zoomed/rebuilt
Beta

Preview channel

Try the next release early.

New features, fresh fixes — and the occasional rough edge. Feedback helps shape the next stable build.

No preview build right now

The latest stable release is 1.2.2. When the next preview opens it lands here first — follow the news to catch it early.

Read the news Previous versions

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