Get the latest version of equalizer apo — the most capable free parametric equalizer available for Windows, trusted by millions of users worldwide.
Released June 10, 2019 | Installer size: 8.3 MB | License: GPLv2
Download Equalizer APO FreeAlso available as a 32-bit build. Need Peace? Visit the Peace Equalizer page after installing.
Before you download equalizer apo, confirm your system meets these minimum requirements to ensure the software installs and runs correctly.
| Component | Requirement | Notes |
|---|---|---|
| Operating System | Windows Vista or later | Supports 32-bit and 64-bit editions |
| Processor | Any modern CPU (x86 / x64) | Extremely low CPU usage — even old hardware works fine |
| RAM | 512 MB minimum | Practically unnoticeable memory footprint |
| Disk Space | ~50 MB after install | Config files may grow depending on your setups |
| Audio Driver | WASAPI-compatible | Standard on all Windows Vista+ systems |
| .NET Framework | 4.0 or later | Required for the Configuration Editor GUI |
| VST Plugins | 32-bit VST 2.x | Optional 64-bit builds available separately |
The hardware bar for equalizer apo is genuinely low. Because the software hooks into Windows Audio Session API (WASAPI) rather than running a separate audio rendering engine, the processing overhead is minimal. Even a decade-old laptop running Windows 10 will handle a twenty-filter equalizer apo chain without breaking a sweat. The CPU usage numbers the developers quote — typically under one percent on modern hardware — hold up in real-world usage, which is one reason the apo equalizer is so popular for always-on setups where you'd never want a background program dragging down game performance or battery life.
If you're running Windows Vista or Windows 7, make sure all available Windows Updates are applied before downloading. Some older Vista installations in particular are missing WASAPI updates that equalizer apo depends on. Windows 10 and Windows 11 users should have everything they need straight out of the box.
Wondering exactly what you get when you download equalizer apo? Here's a breakdown of everything included in the standard installation package.
This is the primary graphical interface for building and tweaking your equalizer apo filter chains. It features a real-time frequency response graph, a modular filter list where you can add, remove, and rearrange processing elements, tabbed configuration files via the Include system, and quick-access controls for enabling or disabling the APO entirely. Most users will spend the majority of their time here when setting up or updating their equalizer for pc.
The Configurator is a smaller utility that handles the registration of equalizer apo as an Audio Processing Object on your chosen devices. You run it once during initial setup and then again any time you want to add or remove devices, or after a Windows update that may have undone the APO registration. In newer versions of the software, this tool was renamed to "Device Selector" to better reflect its purpose.
This plain-text file is the actual brain of the apo equalizer. Every time your audio device passes sound through the system, equalizer apo reads this file and applies the filters and commands it contains. The default file includes a modest preamplification reduction and references the example.txt preset. You'll typically edit or replace this file as part of setting up your custom equalizer pc configuration.
A working example configuration included with every fresh installation of equalizer apo. It shows the basic syntax for preamplification and peaking filters, giving newcomers a concrete starting point to learn from. You can copy the file, rename it, and modify the copy without touching the original as a reference.
An empty folder pre-created in the installation directory, intended as the default location for dropping in VST plugin DLLs. When you add a VSTPlugin filter row in the editor, paths relative to this folder resolve automatically, so you can move your equalizerapo installation and have the plugins follow without needing to update paths manually.
The setup package creates a standard Windows uninstaller entry accessible through Control Panel → Programs → Uninstall a program. Using the uninstaller not only removes the equalizer apo files but also cleans up the APO registration from your audio devices, leaving your system's audio pipeline in the same state it was before you installed the software. It's clean, complete, and leaves no registry orphans behind.
There are several audio tools available for Windows. Here's an honest look at why equalizer apo stands out from the crowd.
The biggest advantage that equalizer apo holds over every competing free equalizer for pc is its system-level integration. Consumer equalizers that operate inside individual apps — like the built-in EQ in Spotify, VLC, or your GPU's audio software — only affect sound from that one program. The moment you switch to a different application, you're back to unprocessed audio. Equalizer apo, by contrast, sits in the Windows audio pipeline itself, processing everything from every program simultaneously. Whether your audio comes from a game, a browser, a video player, or a voice call, equalizer apo catches it all and applies your settings uniformly.
Compared to paid alternatives like Boom 3D or SoundSource (macOS), equalizerapo delivers more actual processing power at literally zero cost. The unlimited-filter capability alone puts it ahead of any consumer EQ you'd pay money for. The trade-off is that the interface is more technical — but that's exactly why the equalizer apo peace combination exists, to bridge the gap between raw processing power and user-friendly presentation.
A brief look at how equalizer apo has evolved over the years, with key features added in each major release.
| Version | Release Date | Key Changes |
|---|---|---|
| 1.4.2 | June 2019 | Current release. Device Selector rename, stability improvements, updated filter engine. |
| 1.3 | 2018 | Added multichannel routing controls, improved VST plugin GUI embedding. |
| 1.2 | 2017 | Real-time config file watching, drag-to-adjust graph interaction introduced. |
| 1.1 | 2016 | VST plugin support added, major editor UI overhaul. |
| 1.0 | 2015 | First stable public release. Core APO framework, basic filters, config editor. |
| 0.x | 2013–2014 | Beta development. Initial system-wide EQ concept, command-line configuration only. |
Version 1.4.2 remains the current recommended download for all users. The fact that development slowed after 2019 is not a cause for concern — equalizer apo works flawlessly on Windows 10 and Windows 11, and Jonas Thedering's codebase is stable and well-tested. The community around the software remains active, producing new presets, writing guides, and contributing to third-party tools like Peace and HeSuVi that build on top of the equalizer apo foundation.
Quick answers to the questions people ask most often before and after downloading equalizer apo.
Downloaded and installed? Here's where to go next to get the most out of your new equalizer for pc.
Head back to the home page and walk through the detailed installation and first-launch guide if you haven't done so already. It covers every step from running the installer through to saving your first custom amplification configuration, with clear explanations of each choice you'll need to make along the way.
Once equalizer apo is running, consider adding the Peace graphical interface on top of it. Peace turns the somewhat technical Configuration Editor into a polished preset browser with hundreds of community-contributed headphone and speaker profiles ready to load. If you use headphones, there's a very good chance someone has already measured and uploaded a compensation curve for your exact model. Visit the Peace Equalizer page for the full setup guide and download information.
The equalizer apo community is spread across several platforms. The SourceForge project page hosts official documentation and a discussion forum where Jonas Thedering and experienced users answer technical questions. Reddit's r/headphones and r/audiophile communities have extensive threads on equalizer apo peace setups and headphone-specific presets. AutoEq on GitHub provides a huge library of machine-generated correction profiles for hundreds of headphone models, all formatted in equalizer apo config syntax ready to drop straight into your setup.
If you use headphones and want a convincing surround sound experience, look into HeSuVi — another third-party application built on top of equalizerapo that adds convolution-based headphone surround virtualization. It leverages the same filter engine that makes equalizer apo such a capable platform and adds a layer of spatial audio processing that many gamers and movie fans find genuinely impressive. More details are available throughout our site.
If you hit a snag during installation or first use, the Troubleshooting section on the home page covers all the most common issues. The Contact page is also there if you need more personalised help.