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ACE-Step 1.5 Online: Free Open-Source AI Music Generator

What ACE-Step 1.5 and 1.5 XL are, what they can do, how to run them locally or in ComfyUI, and how to use ACE-Step 1.5 online for free.

ACE-Step 1.5 is an open-source music generation model released in early 2026 by ACE Studio together with StepFun. It is MIT licensed, runs on consumer GPUs, and generates full songs with vocals from a text prompt and optional lyrics.

Use it online: the generator on our homepage runs ACE-Step 1.5 in the cloud. There is nothing to install and you get free songs every day.

How it works

ACE-Step 1.5 pairs two parts:

  1. A language model (Qwen-based, 0.6B / 1.7B / 4B) that plans the song: structure, tempo, key and an enhanced description
  2. A diffusion transformer (DiT) that renders the actual audio

The team reports a SongEval score of 8.09, above Suno v5, and under 10 seconds per song on an RTX 3090.

Key features

  • Full songs with vocals in 50+ languages, from 10 seconds up to 10 minutes
  • BPM, key and time signature control
  • Cover generation, repainting (regenerate part of a song), track extraction and vocal-to-BGM
  • LoRA training: a handful of songs can be enough to capture a style
  • Batch generation of up to 8 songs at once
  • Trained on licensed and royalty-free music

Model versions

VersionNotes
ACE-Step 1.5 TurboFast distilled model, runs in under 4 GB of VRAM
ACE-Step 1.5 Base / SFTHigher-step models for maximum quality and fine-tuning
ACE-Step 1.5 XL4B-parameter DiT released in April 2026, adds Japanese vocal support

Ways to run ACE-Step 1.5

  • Online (easiest): AceMusic.app
  • Locally: clone ACE-Step/ACE-Step-1.5 from GitHub and use the built-in Gradio UI
  • ComfyUI: official native support, with ready-made text-to-music and audio-to-audio workflows
  • Google Colab: community notebooks run it on a free T4 GPU
  • API: hosted on fal.ai, DeepInfra, Chutes and others

Want better results? Read the ACE-Step prompt guide.

Try it yourself

Generate a song with ACE-Step 1.5 for free, right in your browser.

Generate song

AceMusic.app is an independent website and is not affiliated with, endorsed by, or connected to ACE Studio or its ACE Music product. ACE-Step is an open-source model released under the MIT license.