9 tools, in alphabetical order (this isn't a ranking). Check each tool's commercial-use notes before you ship assets in a game.
| Tool | Free plan | Commercial use | API | MCP |
|---|---|---|---|---|
 AIVA | Free plan | Commercial on paid plans only | Partner / negotiated only | None found |
 Beatoven.ai | Unverified | Commercial use allowed | Available | Unverified |
 ElevenLabs | Free plan | Commercial on paid plans only | Available | Official MCP server |
 Mubert Render | Free plan | Commercial on paid plans only | Available | Unverified |
 SOUNDRAW | Unverified | Commercial use allowed | Available | Unverified |
 Stable Audio | Free plan | Commercial on paid plans only | Available | Unverified |
 Suno | Free plan | Commercial on paid plans only | Partner / negotiated only | None found |
 Udio | Free plan | Not allowed | No public API | None found |
 Unity AI | Free plan | Commercial use unverified | Not applicable | Official MCP server |
AI composer for soundtrack-style music with MIDI and audio export, editable in its built-in editor.
Verdict: For soundtrack-style game music; only the Pro plan gives you the copyright, and the free plan is non-commercial.
AI background-music generator; its site lists games among supported uses.
Verdict: For background music you can monetise; you get a perpetual licence but Beatoven keeps ownership, and pricing is unverified.
Text-to-speech, voices, sound effects and music generation; usable for NPC voice lines and SFX.
Verdict: For NPC voice lines and SFX; free-plan output is non-commercial, so a paid plan is required to ship.
AI-generated royalty-free music tracks by mood, genre and duration, with a track editor.
Verdict: For royalty-free background tracks; game use points to the Business plan, and tracks can't be redistributed as standalone music.
Royalty-free AI music generator where you set genre, mood, length and structure and then edit the track.
Verdict: For editable royalty-free background music; its licence page allows commercial use on all plans (USD pricing unverified).
Stability AI's text-to-audio tool for generating music and audio clips.
Verdict: For generated music and audio clips; the free plan is non-commercial, while paid plans include a commercial licence.
Text-to-music generator for full songs and instrumentals; used for prototyping soundtracks and menu music.
Verdict: For prototype songs and menu music; free-tier output is personal, non-commercial use only.
AI music generation and remixing app.
Verdict: For personal music experiments only; its current terms prohibit commercial use of output, so it isn't suitable for shipped games.
AI built into the Unity Editor: an Assistant for project questions and code, plus generators for images, textures, materials, sounds, 3D models and animations, metered in Unity Credits.
Verdict: For Unity users who want AI inside the editor, with monthly credits included on Personal, Pro and Enterprise plans; AI-output licence terms are unverified.