psai vs Reactional Engine

psai® is an interactive music engine for videogames, aimed at composers and developers creating adaptive soundtracks. Its playback logic can change intensity, recombine musical segments, pause, and respond to gameplay. The Unity edition is written in C# without native code, and the maker says it works on all Unity target platforms. The native C++ SDK is limited to Windows, with evaluation or licensing inquiries directed to the maker. The regular and Pro editions use the same Unity engine; Pro adds the standalone editor for creating projects from scratch. That editor is listed for Win/Mac and requires Music Engine Pro and Pro User Registration. Downloads include a demo soundtrack and eight free music themes. The maker says Unity use across a customer's projects has no further costs or royalties, with one copy required per company seat. However, the editor EULA limits users who have not purchased the engine through the Unity Asset Store to non-commercial editor use, including testing for future commercial use. The site also links to manuals, API documentation, tutorials, and a Unity forum.

Reactional Engine is a framework for generating music note by note in games and changing it as gameplay unfolds. It uses virtual instruments rather than loop-based systems, with controls for key, scale, tempo, and instrumentation. The engine can interpolate, modulate, improvise, and randomize musical elements. It can analyze commercial tracks for tempo and harmony to synchronize generated music and support transitions between generated and commercial material. Unity and Unreal Engine integrations are available; Wwise and FMOD integrations are described, while 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 settings, 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. Pricing is on request for Studio; Free access is listed at free.