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Reactional Engine
Stockholm, Sweden
What it is
Reactional Engine is a framework for generating music in games note by note and changing it in response to gameplay in real time. It uses virtual instruments rather than loop-based systems. Developers can adjust key, scale, tempo, and instrumentation as play unfolds; the engine can also interpolate, modulate, improvise, and randomize musical elements. It can analyze commercial tracks for tempo and harmony to synchronize generated music and support transitions between commercial and generated material. Unity and Unreal integrations are available, while the engine page also describes Wwise and FMOD integrations; Godot is listed as coming soon. Runtime targets include Windows, macOS, Linux, iOS, Android, WebGL, PlayStation 4/5, Xbox, and Nintendo Switch. API examples cover transport controls, musical parameters, stinger triggers, and callbacks for bars, beats, and notes. Windows and macOS binaries are available through the Reactional Platform. Developers can test any track for free and pay on release. Commercial music licensing is described with worldwide perpetual rights, and interactive themes start at $75 per track. Studio pricing is on request.
For and against
For
- Generates music note by note with virtual instruments.
- Changes musical parameters in real time.
- Supports Unity and Unreal integrations.
- Targets desktop, mobile, web, and console platforms.
- Free prototyping is available; payment is on release.
Against
- Studio pricing is on request.
- Godot integration is listed as coming soon.
- Free plan requires a Reactional splash screen.
The verdict
Reactional Engine provides tools for generating and adapting game music in response to play, with broad runtime targets and named integrations. Developers can prototype for free, while Studio pricing is on request and the Free plan requires a splash screen.
Who it suits
Reactional Engine is intended for game developers, composers, and music rights holders working with interactive game music. Its real-time controls and integrations may suit projects that need music to respond to gameplay.
Plans and prices
Free
Forum + Discord support · Reactional splash-screen required
Read 7 Oct 2026 · reactionalmusic.com
Studio
Dedicated contact · Curated music assistance included · Reactional splash-screen optional
Read 7 Oct 2026 · reactionalmusic.com
On the record
- API
- The page gives examples for transport controls, setting musical parameters, triggering stingers, and receiving bar, beat, and note callbacks.reactionalmusic.com · read 7 Oct 2026
- Commercial tracks
- The system analyzes commercial tracks’ tempo and harmony to synchronize generated music and support transitions between commercial and generated music.reactionalmusic.com · read 7 Oct 2026
- Downloads
- Binaries for Windows and macOS are available through the Reactional Platform.reactionalmusic.com · read 7 Oct 2026
- Free prototyping
- The maker says developers can test any track for free and pay on release.reactionalmusic.com · read 7 Oct 2026
- Generation
- It generates music note by note using virtual instruments rather than relying on loop-based systems.reactionalmusic.com · read 7 Oct 2026
- Integrations
- Unity and Unreal are available now, Godot is listed as coming soon, and Wwise and FMOD integrations are described on the engine page.reactionalmusic.com · read 7 Oct 2026
- Intended users
- The platform documentation describes its tools for game developers, composers, and music rights holders.docs.reactionalmusic.com · read 7 Oct 2026
- Musical controls
- The engine can change key, scale, tempo, and instrumentation in real time and can interpolate, modulate, improvise, and randomize musical elements.reactionalmusic.com · read 7 Oct 2026
- Music licensing
- The maker describes commercial music licensing with worldwide perpetual rights and says interactive themes start at $75 per track.reactionalmusic.com · read 7 Oct 2026
- Purpose
- Reactional Engine is a framework for generating interactive music note by note in games and reacting to gameplay in real time.reactionalmusic.com · read 7 Oct 2026
- Security and compliance
- The pages opened describe globally licensed or rights-cleared music and link to a privacy policy, but state no security certification or compliance standard.reactionalmusic.com · read 7 Oct 2026
- Support
- The engine page links to integration support and documentation; the pricing table lists Forum + Discord for Free and dedicated contact for Studio.reactionalmusic.com · read 7 Oct 2026
- Targets
- The engine page lists Windows, Mac, Linux, iOS, Android, WebGL, PS4/PS5, Xbox, and Switch as platform targets.reactionalmusic.com · read 7 Oct 2026
