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No. 4 of 23 ·Game Audio Middleware

psai

Windows · Mac · Linux · Android · iPhone · API

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Freedom report

Three barsScore 6.7

  • Free tierA free tier is on its own pricing page
  • Open codeNo open-source code on record
  • Runs widely5 of 6 device platforms
  • DocumentedPlans, terms and facts published

psai® is an interactive music engine for videogames, intended for composers and developers building adaptive soundtracks. Its playback supports intensity control, automatic recombination of musical segments, pausing, and gameplay-driven logic. The Unity version is written in C# without native code, and the maker says it works on all Unity target platforms. A native C++ SDK is available for Windows only; interested users can contact the maker about evaluation or licensing. The regular and Pro editions use the same Unity engine, but Pro adds the standalone editor for creating projects from scratch. The editor download is listed for Windows and 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 carries no further costs or royalties, with one copy per company seat. However, the editor EULA limits users who have not purchased the engine through the Unity Asset Store to non-commercial use. The site links to a manual, API documentation, tutorials, and a Unity forum.

Who it is for

It suits videogame composers and developers using Unity who need music that adapts to gameplay. The Windows-only native C++ SDK may suit users evaluating that route.

What is good

  • Playback can respond to gameplay logic
  • Unity version uses C# without native code
  • Eight free music themes are listed
  • Unity use across projects has no further royalties

What to know first

  • Native C++ SDK is for Windows only
  • Standalone editor requires Music Engine Pro and Pro registration
  • Some users may use the editor only non-commercially

Verdict

psai® provides adaptive playback for Unity game projects, with a shared engine in its regular and Pro versions. Creating projects from scratch requires Pro, and editor use has a non-commercial restriction for some users.

psai plans and pricing

All plans
psai® for Unity Free Free engine available through Unity Asset Store · use across Unity projects without further costs or royalties · companies purchase one copy per seat homeofpsai.com · 5 Oct 2026
psai® Music Engine Pro Not published Purchase required to create psai® projects from scratch · includes standalone psai® Editor and future updates for registered Pro users homeofpsai.com · 5 Oct 2026

Compared on game audio middleware

Free plan
Yes
Interactive music
Yes
Supported game engines
Unity
Runtime platforms
Windows; Unity target platforms

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