If you need to turn audio into MIDI in 2026, you have three very different paths: a free open-source model from Spotify (Basic Pitch), a free converter that runs entirely in your browser (Sound2MIDI), and a paid all-in-one SaaS (OpenMusic). None is universally "best" — they trade off accuracy, privacy, and how the result drops into your DAW. This guide breaks down what each one really does and the gaps none of them fill, so you can pick without guessing.
The three tools at a glance
| Tool | Cost | Where it runs | Best at | Weak spot |
|---|---|---|---|---|
| Basic Pitch (Spotify) | Free, open source (Apache 2.0) | Local Python / open-source repo | Pitch-aware transcription, reproducible, offline | One instrument at a time; resamples audio |
| Sound2MIDI | Free, no signup | Your browser (no upload) | Private, instant, zero install | Depends on the file your browser can decode |
| OpenMusic | Paid SaaS (credit system) | Cloud | Broad toolkit beyond conversion | No public methodology or accuracy data |
Basic Pitch (Spotify) — open source, local, pitch-aware
Basic Pitch is a neural model released by Spotify under an open-source license. You run it on your own machine with Python, or use one of the community VST wrappers built on top of it. Its standout trait is that it transcribes pitch bends — slide and vibrato actually show up in the MIDI — which most converters flatten.
The honest limits: it expects essentially one prominent instrument at a time, it downsamples stereo input to mono, and it resamples to a fixed rate. Dense mixes (drums under a piano, full band) come out messy, and the project ships no browser UI of its own — you assemble that yourself or use a third-party wrapper.
Sound2MIDI — free, in-browser, private
Sound2MIDI is a free converter that runs the model inside your browser. Your audio is never uploaded; the file is processed locally and you download a standard MIDI file. That makes it the lowest-friction option for a one-off conversion, and the privacy story is simple: there is nothing to leak because nothing leaves the device.
The trade-off is browser-dependent compatibility — whether a given file decodes depends on the visitor's browser, and there is no desktop-grade post-editing suite attached. For "drop a file, get a MIDI, move on," it is the fastest on-ramp.
OpenMusic — paid SaaS, broad toolkit
OpenMusic is a credit-based SaaS that bundles audio-to-MIDI with a larger set of music tools (stem splitting, vocal removal, chord generation, and more) behind one account. If you already live in that ecosystem, conversion is one click among many.
What it does not publish is a methodology or accuracy benchmark. The marketing says "best," but there is no public data behind the claim, and the conversion step is not wired to its stem-splitting tools — you cannot cleanly separate-then-transcribe in one pass.
What all three leave empty
This is the part worth remembering, because it is where useful content actually lives:
- No public accuracy numbers. None of the three publishes measured note-level accuracy (F1, onset error). "Accurate" is asserted, never demonstrated.
- No failure-mode guides. None tells you what to do when the output is garbage — heavy reverb, distortion, a busy mix, or a recording with no clear beat.
- No instrument-specific walkthroughs. "Drums to MIDI," "bass to MIDI," "hummed melody to MIDI" are each a one-line pitch, never a real procedure.
- No honest comparison page. Nobody compares the converters against each other or against desktop standards like Melodyne or RipX.
If you are choosing a tool, those four gaps are exactly the questions that decide it — and they are unanswered on the vendors' own sites.
How to choose
- Want it free and private, right now, with zero install? Use an in-browser converter like Sound2MIDI.
- Want to script it, reproduce it, or keep pitch bends and don't mind Python? Use Basic Pitch locally.
- Already pay for a broad cloud toolkit and just need a quick MIDI? OpenMusic fits.
None replaces careful cleanup in your DAW afterward — transcription is the start of the job, not the end.
FAQ
Is any of these "the most accurate"? No public measurement exists for any of them, so the honest answer is "unknown." Accuracy depends far more on your source audio than on the brand.
Do I need to upload my audio? Only the cloud SaaS requires it. Browser and local options keep the file on your machine.
Can I get a MusicXML or just MIDI? That depends on the tool's export options; Basic Pitch and most browser converters emit standard MIDI, which your notation software can import.
Bottom line
Pick by workflow, not by slogan: browser for speed and privacy, open source for control and pitch bends, SaaS for an all-in-one toolkit. And expect to do real editing after — the converter gives you a sketch, not a finished score.
<p><a class="try" href="https://sound2midi.xyz/">Try the free audio-to-MIDI converter →</a></p>