ControllerBuddy

ControllerBuddy is a free, open-source gamepad mapper designed around flight simulators. It is best suited to Windows and Linux players who want to operate simulator controls from a gamepad, with profiles and virtual joystick output. Its simulator-specific tools are useful, but fixed assignment limits and rolling-release compatibility make it a less compelling fit for setups that require predictable backward compatibility.

Overview

ControllerBuddy maps gamepad inputs to keyboard and mouse actions or a virtual joystick, giving a controller a role in both simulator controls and desktop input. Per-app profiles can be switched between, and community-maintained profiles cover a range of simulators and aircraft, including DCS World and Microsoft Flight Simulator 2020 and 2024. Those examples can provide a starting point for configuration, while the mapper’s mode and trigger constraints still shape what a profile can accomplish.

Its focus is narrower than a general-purpose remapper: modes let controls take on different functions, an overlay shows the active mode and virtual-axis states, and a gamepad-controlled on-screen keyboard can select and hold multiple keys. That feature set suits players trying to fly without a joystick, keyboard, or mouse, but users with unusual control schemes should check the assignment limits before committing to it.

Key features

Profiles, modes and overlay

Profiles can send inputs as keyboard and mouse actions or virtual joystick controls, and profile switching helps separate setups by application. Modes extend that flexibility by assigning different functions to controls; the overlay makes the active mode and virtual-axis states visible. The constraint is that mode actions must sit at the Default Mode level: they cannot be triggered by combinations of multiple buttons or nested within another mode. That is a meaningful limitation for users who rely on layered or chorded mode switching.

Gamepad keyboard and controller support

The on-screen keyboard supports selecting keys and holding several at once, which can help when a simulator or desktop task calls for keyboard input without a physical keyboard. ControllerBuddy supports Xbox Controller, DualShock 4, DualSense, and other controllers supported by SDL_GameControllerDB. The two gamepad triggers cannot be combined into one axis for rudder control, so pilots who expect a merged trigger axis will need another approach.

Simulator setup and integration

Community profiles cover numerous simulators and aircraft. The FAQ describes an example integration with DCS World and says command-line parameters can help connect ControllerBuddy with other applications. On Linux, the official Flatpak includes profiles and optional helper scripts for Proton games and DOSBox Staging. These are practical touches for simulator users, though rolling releases come with best-effort backward compatibility rather than a guarantee that older configurations will keep working unchanged.

Pricing

ControllerBuddy costs nothing. The free and open-source software is released under GNU GPL v3.0, and the free plan includes per-app profiles, profile switching, keyboard and mouse remapping, and virtual controller output. There is no paid tier or trial to weigh against it; this is a full free offering rather than a time-limited evaluation.

That makes it an easy option to consider for players comfortable configuring a focused tool themselves. Its price does not remove the practical trade-offs: the mode-action and trigger restrictions remain, and rolling releases do not promise backward compatibility.

Platforms

ControllerBuddy supports Windows and Linux. Its stated requirements are Windows 10 or 11 (x64) and Linux (x64 or aarch64). The install script covers Windows x86-64 and Linux x86-64 or aarch64; on Windows it configures vJoy, while Linux setup uses udev and uinput. Linux users can also choose the official Flatpak package, which bundles profiles and optional helper scripts for Proton games and DOSBox Staging.

Who it's for

ControllerBuddy is most appropriate for flight-simulator players who want gamepad inputs to stand in for joystick, keyboard, or mouse controls, especially those using Windows or Linux and willing to configure profiles. Its mode overlay, virtual joystick output, and simulator profile examples are more relevant to that audience than to someone seeking only a basic button-to-key mapper.

Look elsewhere if your setup depends on combining the two triggers into one rudder axis, assigning mode actions to button combinations, nesting modes, or preserving compatibility across updates. Users who need those behaviors should verify that another mapper supports their control scheme before switching.

Pros and cons

Pros

• Free and open source under GNU GPL v3.0, with profiles, switching, remapping, and virtual controller output included.
• Simulator-oriented profiles and DCS World integration guidance give flight-sim users a more relevant starting point than generic input mapping alone.
• The mode and virtual-axis overlay, plus an on-screen keyboard that can hold multiple keys, supports controller-led setups.
• Windows and Linux support includes architectures and Linux packaging suited to x86-64 and aarch64 systems.

Cons

• Mode actions are limited to the Default Mode and cannot use multi-button combinations or nested modes, restricting more elaborate control layouts.
• The two triggers cannot be merged into one axis, ruling out a straightforward trigger-based rudder arrangement.
• Rolling releases offer only best-effort backward compatibility, which is a drawback for users who need stable behavior across updates.

Alternatives

AntiMicroX is another free GPL v3 desktop application for Linux and Windows; consider it if you want a free cross-platform mapper without ControllerBuddy’s stated flight-simulator focus. JoyShockMapper is also free and supports Linux and Windows, with a Windows release and Linux builds from source, making it an option for readers seeking a different free mapper on those platforms.

PadLink has a free plan and trial and spans Android, iOS, macOS, and Windows; its Standard plan includes one active controller, so it may suit someone needing broader platform coverage or a trial. Gamepad Mapper is a freemium macOS option, while ControllerMate is a freemium macOS alternative with a free unregistered plan and trial.

Universal Control Remapper is a free open-source option for Windows under the MIT license. DS4Windows is a free Windows application with requirements including Windows 10 or newer, .NET 8.0 Desktop Runtime, Visual C++ Redistributable, and ViGEmBus driver. InputConfig is a free macOS alternative for macOS 14 or later through the Mac App Store.

Browse the Controller Mapping Software and Game Controller Mapper Software lists for more options.

Verdict

Choose ControllerBuddy if you fly simulators on Windows or Linux and want free gamepad-to-keyboard, mouse, or virtual joystick mapping with simulator profiles and mode support. Its focused controls and Linux packaging are strong reasons to consider it. Look elsewhere if trigger merging, layered mode actions, or guaranteed backward compatibility are essential to your setup.