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MuScriptor

muscriptor.kyutai.org

Free plan Open source WebWindowsmacOSLinuxAPISelf-hosted
Visit muscriptor.kyutai.org
Spec score 8.7 #7 of 43 in Audio-to-MIDI converters

What it is

MuScriptor turns audio recordings into MIDI and sheet music, with downloadable MIDI files, sheet-music PDFs, and guitar-tab PDFs from its hosted service. The web demo accepts MP3, WAV, FLAC, OGG, M4A, AIFF, and Opus files. It can transcribe voice, piano, guitars, bass, strings, brass, woodwinds, drums, and other instruments, and users can specify which instruments they expect to improve transcription accuracy. Guitar and bass parts can include tablature alongside standard notation, but the system does not produce chord symbols. MusicXML output can be edited in MuseScore, Sibelius, or Guitar Pro. Users can self-host the web interface, and transcription is also available through a CLI and Python API. Local use requires Hugging Face authentication and acceptance of the model's CC BY-NC 4.0 license. Hosted audio is processed on the server and not retained afterwards; local use keeps audio on the user's machine. The service says it performs better on acoustic and guitar music than electronic music, and that results are not perfect. The hosted demo is free; the code is MIT-licensed, while model weights carry the non-commercial license.

Spec sheet

What it does
MuScriptor converts recordings into multi-instrument MIDI and printable sheet music.Read 14 Oct 2026 · muscriptor.kyutai.org
Purpose
MuScriptor transcribes recordings into MIDI and sheet music.Read 30 Sep 2026 · github.com
Platforms
The repository documents Linux, macOS with Apple Silicon, Windows GPU use and Intel macOS support.Read 30 Sep 2026 · github.com
Integrations
MusicXML output can be edited in MuseScore, Sibelius or Guitar Pro.Read 30 Sep 2026 · muscriptor.kyutai.org
Support
Bug reports and feedback can be sent to [email protected] or submitted as GitHub issues.Read 30 Sep 2026 · muscriptor.kyutai.org
Headquarters
Paris, FranceRead 28 Sep 2026 · muscriptor.kyutai.org
Accuracy limitation
The service says it works better on acoustic and guitar music than electronic music and is not perfect.Read 30 Sep 2026 · muscriptor.kyutai.org
API detail
The Python API supports instrument filtering, sampling, temperature, beam search, batching and prelude forcing.Read 14 Oct 2026 · pypi.org
Audio formats
The web demo accepts MP3, WAV, FLAC, OGG, M4A, AIFF and Opus files.Read 30 Sep 2026 · muscriptor.kyutai.org
Browser interface
The hosted site runs as a JavaScript web transcriber with no installation described on its home page.Read 14 Oct 2026 · muscriptor.kyutai.org
CLI
The package provides a command-line transcribe command that writes MIDI, JSON, JSONL or sheet outputs.Read 14 Oct 2026 · pypi.org
Code licence
The inference and application code is released under the MIT licence.Read 14 Oct 2026 · github.com
Crunchbase facts
Crunchbase lists Kyutai as an active Paris nonprofit with 11–50 employees and founders Laurent Mazare and Neil Zeghidour.Read 14 Oct 2026 · crunchbase.com
Documentation depth
Documentation includes installation, model selection, CLI examples, Python usage, server operation, output formats and development setup.Read 14 Oct 2026 · github.com
Full-mix transcription
The model is designed to transcribe complete mixes containing several simultaneous instruments.Read 14 Oct 2026 · mirelo.ai
Hardware guidance
Small is recommended for CPU-only machines, medium is the default trade-off, and large is intended for GPU use; Apple Silicon uses Metal automatically.Read 14 Oct 2026 · github.com
Independent technical coverage
A Japanese independent article reports that MuScriptor handles full mixes, explains its training approach and compares local, browser and Mirelo Studio use.Read 14 Oct 2026 · note.com
Independent usage report
A Russian video review demonstrates local installation, memory use, MIDI export and opening results in MIDI editors.Read 14 Oct 2026 · rutube.ru
Input formats
The local package accepts WAV and other formats supported by libsndfile, including MP3, FLAC, OGG and M4A.Read 14 Oct 2026 · huggingface.co
Instrument detection
It detects and labels parts such as voice, drums, bass and synth lead.Read 14 Oct 2026 · mirelo.ai
Instrument targeting
Users can specify expected instruments to improve transcription accuracy.Read 30 Sep 2026 · muscriptor.kyutai.org
Instruments
It can transcribe voice, piano, guitars, bass, strings, brass, woodwinds, drums and other instruments.Read 30 Sep 2026 · muscriptor.kyutai.org
Kyutai company
LinkedIn lists Kyutai as a Paris nonprofit founded in 2023 with 11–50 employees.Read 14 Oct 2026 · linkedin.com
Kyutai funding
Kyutai says it is funded by Iliad Group, CMA CGM Group and Schmidt Sciences.Read 14 Oct 2026 · kyutai.org
Launch news
Kyutai and Mirelo announced the open model and free audio-to-MIDI product on 9 July 2026.Read 14 Oct 2026 · mirelo.ai
Limit: local performance
A reproducibility report found Large inference on an RTX 4090 Docker setup over six times slower than manual hosted-demo timings.Read 14 Oct 2026 · github.com
Limit: MusicXML
A Windows user opened a bug stating that generated MusicXML differed substantially from the source score.Read 14 Oct 2026 · github.com
Limit: transcription errors
A reported case had sustained blocks, overlapping instruments, wrong instrument labels and a slowdown toward the end of a song.Read 14 Oct 2026 · github.com
Limit: velocity
A user reported that every note was exported with velocity 100, losing loudness information.Read 14 Oct 2026 · github.com
Local deployment
The same web UI can be self-hosted with `uvx muscriptor serve`, and transcription is available through a CLI and Python API.Read 30 Sep 2026 · github.com
Local requirements
Local use requires Hugging Face authentication and acceptance of the CC BY-NC 4.0 model license.Read 30 Sep 2026 · github.com
Local server API
The self-hosted server exposes POST /transcribe and streams note events with Server-Sent Events.Read 14 Oct 2026 · github.com
Mirelo legal entity
Mirelo's product pages identify the company as Mirelo AI GmbH.Read 14 Oct 2026 · mirelo.ai
Model architecture
The released models use a decoder-only transformer that predicts transcription tokens from five-second audio chunks.Read 14 Oct 2026 · mirelo.ai
Model variants
Small, medium and large checkpoints contain about 103 million, 307 million and 1.4 billion parameters respectively.Read 14 Oct 2026 · github.com
MuseScore dependency
PDF sheet engraving requires MuseScore 4 or newer installed separately.Read 14 Oct 2026 · github.com
Musical context
The associated application can detect chords, key, tempo, meter, beats and downbeats.Read 14 Oct 2026 · mirelo.ai
Operating systems
Documented local commands cover Linux, Apple-Silicon macOS, Intel macOS and Windows.Read 14 Oct 2026 · github.com
Outputs
The hosted service provides MIDI, sheet-music PDFs and guitar-tab PDFs for download.Read 30 Sep 2026 · muscriptor.kyutai.org
Praise: timing
A GitHub user reported that note timing and lengths were good in testing.Read 14 Oct 2026 · github.com
Python package
MuScriptor is installable from PyPI with uv or pip and exposes a TranscriptionModel class.Read 14 Oct 2026 · pypi.org
Release status
PyPI labels the package Beta and lists version 0.3.0 released on 5 August 2026.Read 14 Oct 2026 · pypi.org
Research publication
The MuScriptor paper was submitted to arXiv on 9 July 2026 and revised on 3 August 2026.Read 14 Oct 2026 · arxiv.org
Security and privacy
Uploaded audio is transcribed on the server and not kept afterwards; running locally keeps audio on the user's machine.Read 30 Sep 2026 · muscriptor.kyutai.org
Self-hosting
The repository documents running the same web UI locally with uvx muscriptor serve.Read 14 Oct 2026 · github.com
Separate tracks
Each detected instrument is returned as its own editable MIDI track.Read 14 Oct 2026 · mirelo.ai
Sheet music output
The tool can export MusicXML, full scores, individual PDF parts and tablature for supported fretted instruments.Read 14 Oct 2026 · mirelo.ai
System requirements
The package requires Python 3.10 or newer; Intel Macs should use Python 3.10–3.12.Read 14 Oct 2026 · pypi.org
Tabs and notation
Fretted instruments such as guitar and bass produce tablature alongside standard notation, and the system does not write chord symbols.Read 30 Sep 2026 · muscriptor.kyutai.org
Training data
The model was trained on 170,000 songs spanning classical music to heavy metal.Read 30 Sep 2026 · muscriptor.kyutai.org
Usage restriction
Users must have the necessary rights to music they submit and to generated outputs, and the model is provided without warranty.Read 14 Oct 2026 · huggingface.co
Usage scale
Kyutai said in a LinkedIn update that its server was transcribing hundreds of songs per day two months after release.Read 14 Oct 2026 · linkedin.com
Weights licence
The Hugging Face model weights use CC BY-NC 4.0 and are restricted to non-commercial use.Read 14 Oct 2026 · huggingface.co

Plans and prices

Free Free free hosted demo · MIT-licensed code · model weights CC BY-NC 4.0 non-commercial Read 30 Sep 2026 · muscriptor.kyutai.org
Free open-source MuScriptor Free browser transcription · MP3/WAV upload · MIDI · sheet-music PDFs · guitar tabs Read 14 Oct 2026 · muscriptor.kyutai.org

Every MuScriptor plan and price →

Strong points and limits

Strong points

  • Hosted demo is free.
  • Accepts seven listed audio formats.
  • Produces MIDI, sheet music, and guitar tabs.
  • Offers a CLI and Python API.
  • Local use keeps audio on the user's machine.

Limits

  • Transcription is not perfect.
  • Results are better on acoustic and guitar music than electronic music.
  • Chord symbols are not produced.
  • Local use requires authentication and license acceptance.

Who it suits

MuScriptor suits musicians who want to turn recordings into editable notation or MIDI, particularly for acoustic and guitar music. Local deployment may suit users who want audio to stay on their own machine and can meet the model access requirements.

Verdict

MuScriptor offers several output formats and ways to use its transcription system, including local deployment. Expect limitations with electronic material and chord-symbol notation.

Where Specifiction places it

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