Clean melody
Free first pass
Try Basic Pitch, Jukeblocks, or Local MIDI, then check bends and note joins.
Audio to MIDI converter
Choose by the repair you can verify, not by an accuracy claim.
Short answer: use Basic Pitch or Jukeblocks for a clean single line; use a workflow with explicit stem or note editing for chords and full mixes. Every export needs a DAW check for missing notes, false notes, timing, and split sustains.
The practical pick
Melody: start with a free browser pass. Polyphony: separate parts or choose a deeper editor. Do not trust a headline score until the same passage survives the four checks below.
One consistent test language
What the leading first-page tools say about single notes and mixes
| Tool | Single-note material | Chords / full mix | What to verify after export |
|---|---|---|---|
| Jukeblocks | Its page says single instruments, vocals, and piano work best. | Dense mixes need editing; its Recreate workflow offers separate bass, chords, and melody tracks. | False notes and edits in dense passages. |
| AI-MIDI | Models expose pitch, dynamics, and sustain controls; Piano and Guitar are listed. | Multi is marked beta/paid; no hard accuracy number is published. | Model choice, missing notes, and sustain behavior. |
| Basic Pitch | Designed for single-instrument audio with pitch-bend detection. | It is not presented as a full-mix stem separator. | Bends, quiet notes, and note joins. |
These are page claims and workflow descriptions, not a shared benchmark. The useful comparison starts when you inspect the same bar in the exported MIDI.
Measured on Local MIDI
Three boundary signatures you can reproduce
| Input | Observed output | Meaning in a DAW |
|---|---|---|
| Pure 40 Hz sine | One note: MIDI 89 (about 1397 Hz), 1.974 s. | A low tone can arrive as a high, wrong-octave event. |
| Pure 1550 Hz sine | One note: MIDI 79 (about 784 Hz), 1.974 s. | A high tone can arrive roughly an octave low. |
| 440 Hz with ±150-cent vibrato at 6 Hz | 23 notes, alternating MIDI 68 and 70, about 0.075–0.093 s each; highest sensitivity produced 0 notes. | One held sound becomes short fragments—or disappears at a stricter threshold. |
Conditions: 44100 Hz mono, 2 seconds, pure sine, no harmonics or noise. These are measured Local MIDI readings, not a claim about every instrument. The hard boundaries to watch are below 55 Hz, above 1400 Hz, and strong vibrato or bends.
DAW check
Four readings beat one accuracy percentage
| Reading | Count this | Choose the workflow when… |
|---|---|---|
| Missing notes | Source notes absent from MIDI | Quiet notes or dense chords matter. |
| False notes | MIDI events with no source match | You need a fast piano-roll cleanup. |
| Timing | Starts/ends drifting from the source | Pitch is right but the groove is not. |
| Split sustains | One held sound exported as fragments | Vibrato, slides, or thresholds are present. |
Workflow choice
Match the source to the work after export
Chords
Inspect every bar
Use a workflow that exposes separate parts or lets you correct notes directly.
Full mix
Separate first
Stem-separate before conversion when overlapping instruments make attribution ambiguous.