Overview
ACE-Step is an open-source music generation foundation model developed by ACE Studio and StepFun, released in early 2026 and rapidly adopted as the leading free alternative to cloud music tools like Suno and Udio. Unlike hosted services, it runs entirely on your own hardware — a Gradio web UI on your GPU — so you own the software, the outputs, and the workflow, with no subscription, no credits, and no terms-of-service restrictions. Architecturally it pairs a lightweight language model “planner” that sketches song structure (key, tempo, form) with a diffusion transformer “performer” that renders the audio, generating up to four minutes of music in roughly 20 seconds on an A100 and under 10 seconds on modern consumer cards. The result is a complete song with vocals, instruments, and arrangement rather than a short loop. Because it is MIT-licensed and trained on licensed or royalty-free material, the outputs are safe for commercial use, and the project explicitly encourages disclosure of AI involvement when publishing. For indie creators, game developers, and producers who need background music without licensing fees, ACE-Step removes the copyright and cost barriers that cloud tools impose.
Key Features
- Local-first text-to-music — describe style, instruments, mood, and lyrics, and generate a full song entirely offline on your GPU
- Six creative modes — text-to-music, remix, repaint (fix one section), Lego (stack layers), extract (pull stems), and complete (add accompaniment)
- Custom LoRA training — fine-tune on your own reference tracks to build a consistent personal sound
- Long-form and multilingual — supports tracks from 10 seconds up to 10 minutes in 50+ languages
- Low hardware floor — runs on ~4GB VRAM (RTX 3060 class) with Apple Silicon, AMD ROCm, and CPU fallbacks
- ComfyUI integration — node-based pipelines for batch generation and complex music workflows
Pricing
| Plan | Price | For |
|---|---|---|
| Open Source | $0 | Self-hosted local use, MIT license, full commercial rights |
| Cloud GPU (optional) | Pay per GPU-hour | Rent an instance if you lack a local GPU |
| Enterprise | Custom | Hosted/on-prem support and SLAs |
Comparison
Compared to Suno, ACE-Step trades instant convenience for full local ownership, privacy, and free unlimited generation — Suno is easier to start but locks outputs behind a subscription and ToS. Against Udio, ACE-Step keeps your music on your own machine and adds custom LoRA training that Udio’s licensed-remix model does not offer. If you want a hosted, zero-setup experience instead, Mureka is the closer competitor, but it cannot match ACE-Step’s cost floor of zero.