Audacity 4.0: The Essential Audio Editor Finally Gets Its Glow-Up

For years, Audacity has been the undisputed king of free audio editing software, but its user interface stubbornly looked like it was trapped in the Windows XP era. That finally changes this week.

Audacity 4.0 has officially launched, bringing the most significant feature update the open-source software has seen in over five years. By completing a massive two-year migration to the Qt6 toolkit, the developers have delivered a highly requested dark mode, a sleek modern UI, and a suite of granular editing tools that make it feel closer to professional Digital Audio Workstations (DAWs) like Ableton Live or ProTools.

A Much-Needed Modern Interface

The immediate standout of Audacity 4.0 is the complete visual overhaul. The rigid, dated menus are gone, replaced by a dynamic, customizable layout that feels natural to anyone used to modern creative software.

• Native Dark Mode: Long requested by late-night podcasters and producers, Audacity now fully supports native dark and light modes, and can dynamically follow your operating system's UI accent colors.
  
  
• Customizable Workspaces: You are no longer tied to one static layout. Toolbars and panels can be popped out, moved, or closed entirely. You can build your own custom layouts or choose from built-in templates like Modern, Classic, and Music.
  
  
• HDPI Scaling: The switch to the Qt6 framework means Audacity finally scales smoothly and natively on high-resolution 4K and Retina displays.
  
  

Granular, Professional-Grade Editing

While the visual facelift is welcome, the real power of Audacity 4.0 lies in its completely rewritten clip editing model. It bridges the gap between a basic audio cutter and a fully-fledged DAW.

• Sample-Level Micro-Adjustments: You can now zoom in far enough on a waveform to edit down to the individual sample level. This is a massive addition for fixing micro-imperfections, clicks, or pops in an otherwise perfect vocal take without destroying the surrounding audio.
  
  
• Non-Destructive Workflows: Editing just became significantly less stressful. The update introduces real-time gain envelopes, clip grouping, and overlapping clips, expanding the ways you can manipulate audio without permanently altering the source file.
  
  
• The Dedicated Split Tool: By pressing 'S' and clicking a waveform or clip header, you can instantly split audio segments, removing the clunkiness of the older select-and-cut methods.
  
  
• Track Meters: Each individual track now features an accompanying live playback meter in its header. This allows you to quickly isolate and identify exactly which specific channel is clipping your master mix.
  
  

One slightly controversial change for long-time users is the removal of the old "sync-lock" feature—which traditionally kept multiple clips locked in tandem—but the developers have implemented new intelligent keyboard shortcuts to replicate that workflow.

Under the Hood: Format Changes and Plugins

To support all these new non-destructive features and interface layouts, Audacity 4.0 transitions to a new .aup4 project file format. This format efficiently stores preview thumbnails alongside the new clip and appearance data. It natively converts older .aup3 files, though it is a one-way street—you cannot save a new .aup4 project backwards into older formats.

Plugin support remains stellar, with ongoing compatibility for VST3, Nyquist, LV2, and Audio Units, plus the long-awaited addition of official ASIO playback and recording support for Windows users.

To make room for the new architecture, a few older features have been temporarily sidelined—most notably MIDI tracks and the mixer board. The developers intend to rebuild and return these in future patches.

Audacity has managed to completely modernize its interface and toolset while remaining entirely free. For independent creators, podcasters, and bedroom musicians, Audacity 4.0 isn't just an update—it is an entirely new era.