Live tuning
Centered on the decision.
The current note, direction, cents, and settling state dominate. The persistent Stop control stays reachable while the rest of the page scrolls.
For piano technicians
Tune the piano
in front of you.
Stretchwise listens to the partials of each string, measures its inharmonicity, and builds a stretch curve for that instrument—not an average piano.
Explore the tuner
Coming soon for iPhone and iPad
- 88
- keys mapped
- 56
- historical temperaments
- A392–497
- reference range
−0.1 centsIn tune
AutoNoteReady for the next key
Instrument-specific curveHands-free workflowWorks offlinePrivate by design
Feel the difference
A meter that tells you what matters.
Read the direction, distance, and confidence at a glance. Stretchwise holds the last trustworthy reading through silence and shows when a note has genuinely settled.
- Flat or sharp in plain languageColour supports the reading; it never carries the meaning alone.
- Stable between strikesThe last good measurement remains visible without pretending it is new.
- Hands-free when you need itPlay the next key and AutoNote follows, saving where you left the last note.
Interactive meter Listening
A4
Flat0Sharp
Flat · tune upward
One continuous workflow
From first strike to finished record.
Every screen is designed around the technician’s sequence—not around the software’s internal model.
- 01
Choose the piano
Create or select an instrument so readings, curve corrections, reference pitch, visits, and notes stay together.
- 02
Listen and settle
Strike the displayed key. The meter smooths the reading, rejects likely room noise, and shows progress as the pitch steadies.
- 03
Move hands-free
Play the adjacent key and Stretchwise follows. Or tap the large note to jump directly anywhere on the keyboard.
- 04
Review and share
See the whole piano against its targets, return to notes that need work, and export a PDF or CSV report.
Inside Stretchwise
Depth when you want it. Calm when you don’t.
These are live screens from the current iPhone and iPad builds.
Per-note targets
Correct the curve, precisely.
Nudge a single target in half-cent steps or carry the correction through its octave chain. The adjustment remains with that piano.
Direct navigation
Any key, one tap away.
The note picker opens around the current key. AutoNote handles the normal sequence; direct selection handles everything else.
Tuning preferences
Set the room, then tune.
Reference pitch, haptic feedback, AutoNote behaviour, pitch-raise tools, and demo mode live together without crowding the meter.
iPad
More room, same focus.
The interface expands into a centred, glanceable workspace in portrait. Wider windows can add an analysis sidebar without stretching the tuner.
Target curveMeasured inharmonicity
A0A2A4A6C8
The piano is the model
Stretch starts with measured strings.
Piano strings are stiff. Their partials run progressively sharp, and every scale and instrument behaves differently. Stretchwise fits multiple partials, estimates inharmonicity note by note, and uses those measurements to shape the target curve.
A restrained curve with closer octaves and a clear, composed center.
Three stretch styles let the technician choose the musical character while the measured piano remains the foundation.
A complete working toolkit
The detail behind the calm display.
Overview and triage
Every saved note appears against its target. Jump to the notes that need attention or continue with the next unmeasured key.
Historical temperaments
Choose from 56 meantone, well and Bach temperaments, each calculated from its original definition, or create your own and import TuneLab temperaments.
Pitch raise
Calculate per-note overpull for a piano far below pitch, with safeguards and a one-string unison workflow.
Spectrum and partials
Inspect the spectrum around the relevant partial, the fitted string model, and possible split-unison behaviour when the simple answer is not enough.
Piano records
Keep client, instrument, location, visit history, tuning settings, readings, and corrections in one durable record.
Import and report
Bring in supported TuneLab, Entropy, and note-table files. Share a finished tuning as a polished PDF or detailed CSV.
Your work stays yours
Made for concert halls, basements, and everything between.
Measurement and piano records work offline. Back up every piano to a file you control. When iCloud sync is enabled in a configured build, private records can stay current across your own devices.
Stretchwise for iPhone and iPad
A quieter screen.
A more informed tuning.
The app is in active development and is not yet available on the App Store.
Questions? Talk to us