Sight-sing any sheet music with 1 photo.
viSolfa photographs one page of standard sheet music (五线谱) and overlays solfège labels directly onto your original photo. Teacher markings, pencil fingerings, and layout remain 100% intact.
✨ Original handwritten teacher notes and pencil marks stay untouched under the vector pill layer.
Non-Destructive Sight-Singing
Preserves your score's physical reality.
Traditional OMR (e.g. DomiSol)
Re-engraves the score from scratch into Jianpu or tonic sol-fa.
- • Erases teacher pencil annotations and fingerings
- • Destroys original measure layout and spatial muscle memory
- • Re-engraving errors confuse complex polyphony
The viSolfa Paradigm
Treats your score photo as an augmented document with vector overlays.
- • 100% of your notes, markings, and stamps remain visible
- • Toggle movable-do and fixed-do instantly with zero lag
- • 1-tap manual key override recovers from any lighting glitch
Two Solfège Methodologies
Movable-Do (首调) & Fixed-Do (固定音名)
Movable-Do (首调)
Tonic Follows KeyThe tonic pitch of the key signature is always sung as Do (1). Ideal for vocal music, choir sight-singing, and Kodály music education.
Fixed-Do (固定音名)
C = Do AlwaysC is always Do, regardless of the key signature. Favored by conservatories and instrumentalists (piano, violin), completely immune to key errors.
Zero Theory Hallucination
Decoupled Perception & Rule Layer
On-Device Object Detection
Core ML & LiteRT detect staff systems, clef anchors, key signatures, and notehead coordinates natively on Apple Neural Engine.
Pure Music Theory Engine
A 100% deterministic rule engine resolves tonic and scale degrees across all 30 Major/Minor keys without neural hallucination.
Transparent Dual-Entity Model
Three Clear Tiers
Community
- ✓ 20 page scans / month
- ✓ Movable-Do (首调) mode
- ✓ 100% local, no account required
- • Subtle watermark on exported scores
Pro
- ✓ 100 page scans / month
- ✓ Both Movable-Do & Fixed-Do
- ✓ No watermark on exports
- ✓ Optional cloud synchronization
Max
- ✓ Unlimited score scans
- ✓ 100% Ad-Free experience
- ✓ Handwritten score recognition
- ✓ PDF & MusicXML vector export
- ✓ Classroom & multi-user license
Ready to master your sight-singing?
Join our private iOS TestFlight build or explore the open-source music theory engine on GitHub.