Reactional Engine

Web · Windows · Mac · Linux · Android · iPhone · API

Freedom report

Two barsScore 5.5

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely6 of 6 device platforms
DocumentedThinly documented

Reactional Engine is ranked #16 of 23 in game audio middleware on Freedom251. It runs on Android, API, iOS, Linux, macOS, Web, Windows. There is a free plan. A free trial is offered.

Reactional Engine plans and pricing

All plans

Free Free Forum + Discord support · Reactional splash-screen required reactionalmusic.com · 7 Oct 2026

Studio Not published Dedicated contact · Curated music assistance included · Reactional splash-screen optional reactionalmusic.com · 7 Oct 2026

Compared on game audio middleware

Interactive music: Yes
Supported game engines: Unity, Unreal Engine
Runtime platforms: Windows, macOS, Linux, iOS, Android, WebGL, PlayStation 4/5, Xbox, Nintendo Switch

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The record

Purpose: Reactional Engine is a framework for generating interactive music note by note in games and reacting to gameplay in real time.
Musical controls: The engine can change key, scale, tempo, and instrumentation in real time and can interpolate, modulate, improvise, and randomize musical elements.
Generation: It generates music note by note using virtual instruments rather than relying on loop-based systems.
Commercial tracks: The system analyzes commercial tracks’ tempo and harmony to synchronize generated music and support transitions between commercial and generated music.
Integrations: Unity and Unreal are available now, Godot is listed as coming soon, and Wwise and FMOD integrations are described on the engine page.
Targets: The engine page lists Windows, Mac, Linux, iOS, Android, WebGL, PS4/PS5, Xbox, and Switch as platform targets.
API: The page gives examples for transport controls, setting musical parameters, triggering stingers, and receiving bar, beat, and note callbacks.
Downloads: Binaries for Windows and macOS are available through the Reactional Platform.
Support: The engine page links to integration support and documentation; the pricing table lists Forum + Discord for Free and dedicated contact for Studio.
Free prototyping: The maker says developers can test any track for free and pay on release.
Music licensing: The maker describes commercial music licensing with worldwide perpetual rights and says interactive themes start at $75 per track.
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.
Intended users: The platform documentation describes its tools for game developers, composers, and music rights holders.
Headquarters: Stockholm, Sweden
Price from: Free

Where it ranks on Freedom251

Best Game Audio Middleware in 2026#16 of 23

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Sources

reactionalmusic.com/engine/· checked 7 Oct 2026
reactionalmusic.com/developer/· checked 7 Oct 2026
docs.reactionalmusic.com/Platform/· checked 7 Oct 2026