Amplitude Audio SDK vs Reactional Engine
Amplitude Audio SDK
amplitudeaudiosdk.comReactional Engine
reactionalmusic.comSide by side
| Figure | Amplitude Audio SDK | Reactional Engine |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | — | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| API | — | Yes |
| Plans published | 3 | 2 |
| Spec score · Game Audio Middleware | 8.4 (#6) | 7.8 (#14) |
| Integrations | Official integrations are available for O3DE, ezEngine, Godot 4+, and Flax Engine. | Unity and Unreal are available now, Godot is listed as coming soon, and Wwise and FMOD integrations are described on the engine page. |
| Purpose | Amplitude is a cross-platform audio engine designed for games and supports audio for 2D, 3D, and VR/AR environments. | Reactional Engine is a framework for generating interactive music note by note in games and reacting to gameplay in real time. |
| Security and compliance | The opened maker pages identify the SDK as open source under Apache-2.0 and do not state a security certification or compliance standard. | The pages opened describe globally licensed or rights-cleared music and link to a privacy policy, but state no security certification or compliance standard. |
| Support | The documentation directs users with installation issues to Discord and recommends Discord community support or GitHub issues for troubleshooting. | The engine page links to integration support and documentation; the pricing table lists Forum + Discord for Free and dedicated contact for Studio. |
Plans
Amplitude Audio SDK
- Amplitude Audio SDKFree
- Amplitude Studio FreeFree
- Amplitude Studio PaidPriced on request
In their own words
Amplitude Audio SDK
Amplitude Audio SDK is a cross-platform audio engine for games, supporting audio for 2D, 3D, and VR/AR environments. It runs on Android, iOS, Linux, macOS, and Windows; Windows, Linux, and macOS are listed as runtime platforms. Project assets are defined in JSON and compiled into binary sound banks for runtime loading. Audio options include stereo panning, binaural rendering with user HRTF assets, and Ambisonic rendering. Developers can configure processing per runtime platform, including filters, room effects, and spatialization, and extend the pipeline with plugins. A MiniAudio-based default driver and MP3 and WAV decoding are included. Official integrations are listed for O3DE, ezEngine, Godot 4+, and Flax Engine. The SDK is free and open source under Apache-2.0, but it is in beta without an official release; nightly builds are for development, not production. Amplitude Studio is in early access with complimentary access during that phase; its planned free version has non-commercial and feature limits.
Reactional Engine
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.