— Audio Tool

AceStep

Last updated 2026-07-15 · Reviewed by ToolForge Editorial

Open-source AI music generation model that writes full songs with vocals, stems, and lyrics.

★ 4.4/5 · Growing · Since 2025 · Free (open source)

Free open source

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Suno-quality music, but open

AceStep is an open-weight music generation model (a collaboration involving ACE Studio and StepFun) that generates complete tracks up to 4 minutes with vocals, instrumentation, and downloadable stems. It runs locally via ComfyUI and similar nodes, giving musicians and developers a private, customizable alternative to hosted music AIs like Suno and Udio.

Who it's for: Musicians, producers, and developers who want to generate and own music without per-song fees or cloud lock-in.

Key features

🎵 Full songs

Generate up to 4 minutes with melody, vocals, and arrangement.

🎚️ Stems & lyrics

Output separated stems and editable lyric sheets.

🖥️ Local inference

Run on your GPU via ComfyUI nodes.

🔓 Open weights

Apache-licensed for commercial and personal use.

The honest take

✓ What works

Free and open-weight
Full stems for remixing
Runs offline
Strong vocal quality

✗ What doesn't

Needs a decent GPU
Prompting is finicky
Smaller model ecosystem
No hosted editor yet

Verdict

AceStep is the open-source answer to Suno. If you want to generate music you fully own, this is the tool to watch in 2026.

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